• <tr id="yyy80"></tr>
  • <sup id="yyy80"></sup>
  • <tfoot id="yyy80"><noscript id="yyy80"></noscript></tfoot>
  • 99热精品在线国产_美女午夜性视频免费_国产精品国产高清国产av_av欧美777_自拍偷自拍亚洲精品老妇_亚洲熟女精品中文字幕_www日本黄色视频网_国产精品野战在线观看 ?

    Cathodic and Thermal Stabilities of the P(VdF-HFP)-Based Ionic Liquid Composite Polymer Electrolyte

    2014-10-14 03:44:10CUIWenYuANMaoZhongYANGPeiXiaZHANGJinQiu
    物理化學學報 2014年5期
    關(guān)鍵詞:熱穩(wěn)定性丙烯陰極

    CUI Wen-Yu AN Mao-Zhong YANG Pei-Xia ZHANG Jin-Qiu

    (School of Chemical Engineering and Technology,Harbin Institute of Technology,Harbin 150001,P.R.China)

    Cathodic and Thermal Stabilities of the P(VdF-HFP)-Based Ionic Liquid Composite Polymer Electrolyte

    CUI Wen-Yu AN Mao-Zhong*YANG Pei-Xia ZHANG Jin-Qiu

    (School of Chemical Engineering and Technology,Harbin Institute of Technology,Harbin 150001,P.R.China)

    Abstract:We report on a composite polymer electrolyte containing the ionic liquid 1-ethyl-3-methylimidazolium hexafluorophosphate(EMIPF6).This composite polymer electrolyte is based on the poly(vinylidene fluoride-co-hexafluoropropylene)(P(VdF-HFP))polymer matrix and is a potential electrolyte for use in lithium ion batteries.The ionic conductivity of the composite polymer electrolyte was measured by electrochemical impedance spectroscopy(EIS).Linear sweep voltammetry(LSV)was performed to investigate the electrochemical stability window of the polymer electrolyte.The thermal properties for the composite polymer electrolyte were also characterized by thermogravimetry(TG)and by a flammability test.The results show that the presence of the EMIPF6ionic liquid increases the ion transport properties greatly but a better cathodic stability is only obtained by the addition of organic additives such as ethylene carbonate-propylene carbonate(EC-PC),which extends the cathodic stability to 0.3 V.This corresponds to an electrochemical stability window of 0.3-4.3 V.The selected Li4Ti5O12anode and LiCoO2cathode materials exhibit acceptable electrochemical performance in combination with the prepared P(VdF-HFP)/LiPF6/EMIPF6/EC-PC composite polymer electrolyte.At a charge-discharge rate of 0.1C,Li/LiCoO2and Li/Li4Ti5O12have reversible capacities of 130 and 144 mAh·g-1,respectively.However,the corresponding thermal performance is suppressed because of the presence of organic additives.

    Key Words:Lithium ion battery;Ionic liquid;Composite polymer electrolyte;Cathodic stability;Thermal stability

    Commercial lithium ion batteries using non-aqueous organic solvents as electrolyte has been utilized extensively in portable electronic devices and the promising applications in electric vehicles are also in near future by virtues of attractive high energy density and prolonged cycle life[1].However,the dangers of liquid leakage,flammability,or even explosion are inevitable in abuse conditions due to the flammable and volatile natures of organic solvents.Accordingly,exploiting new type of electrolyte with the enhanced safety is currently the urgent investigation.Polymer electrolyte[2-3]is one of the possible options for improved safety by conversing the liquid into polymer structure.But the technological problem of polymer electrolyte is the relative low ionic conductivity compared with conventional organic electrolyte.During previous years,many methods have been reported to enhance the ionic conductivity of polymer electrolyte,such as addition of nano-inorganic fillers[4-7],incorporation of organic solvent[8-10].However,their electrochemical properties are still unsatisfactory compared with organic electrolyte.

    In recent years,ionic liquid,consisted of only cation and anion,is becoming the hot issue in energy storage fields by virtue of low vapor pressure,high conductivity,low toxicity,excellent thermal and electrochemical stabilities[11-12],which are attractive for overcoming the inherent ionic conductivity limitations of polymer electrolytes.In the previous reports,poly(ethylene oxide)(PEO)-based polymer electrolyte containing the ionic liquid of N-methyl-N-propylpyrrolidinium bis(trifluoromethanesulfonyl)imide(PYR13TFSI)[13],N-butyl-N-methylpyrrolidinium bis(trifluoromethanesulfonyl)imide(PYR14TFSI)[14],1-butyl-4-methylpyridinium bis(trifluoromethanesulfonyl)imide(BMPyTFSI)[15]have been investigated extensively,but the ionic conductivity rarely reached 10-3S·cm-1at room temperature.On the other hand,poly(vinylidene fluoride)(PVdF)[16]or poly(vinylidene fluoride-co-hexafluropropylene)P(VdF-HFP)[17-18]polymer electrolyte containing ionic liquid has also aroused much attention due to their higher ionic conductivities.Though the ionic conductivity reaches 10-3S·cm-1at room temperature,the electrochemical performance of cathode or anode materials using such ionic liquid-PVdF(or P(VdF-HFP))composite polymer as electrolyte is not reported in details elsewhere.

    Among various ionic liquids,imidazolium cation(EMI+)-based ionic liquid owns the low viscosity and high ion conductivity,which is favorable features to promote the ion transport properties of polymer electrolyte.However,EMI+ionic liquid encounters the problem of cathodic stability[19-22]and trends to discompose around 1.5 V(vs Li/Li+),which makes it unusable in combination with lithium anode or carbon anode.Some literature[18,23]demonstrates that addition of organic solvents(such as ethylene carbonate(EC),propylene carbonate(PC))can improve the cathodic stability effectively by formation of passivation film,which suppresses the decomposition of ionic liquid and improves the interfacial compatibility.However,although the electrochemical performance is improved,it is most likely that the organic additives may reduce the thermal stability of ionic liquid-polymer composite electrolyte again.In this point,related investigations are not reported according to our knowledge and it is important to verify this concern as soon as possible for gaining both better electrochemical performance and higher safety.

    In this study,ionic liquid-P(VdF-HFP)composite polymer electrolyte comprised of EMIPF6ionic liquid,P(VdF-HFP)polymer,LiPF6salt,and EC-PC organic additives were synthesized and investigated as possible electrolyte for lithium ion batteries.The performance of Li/LiCoO2and Li/Li4Ti5O12coin cells using prepared composite polymer electrolyte were investigated.Furthermore,thermal stability of the prepared composite polymer electrolyte was evaluated.

    1 Experimental

    P(VdF-HFP)(MW=500000,Aldrich,USA)and LiPF6(Merck,USA)were received and dried under vacuum for 48 h at 50°C.EMIPF6(Acros Organics,Belgium)was used as received.LiCoO2(Shanshan,Hunan,China)and Li4Ti5O12(Altairnano,USA)were dried under vacuum at 150°C.

    Composite polymer electrolyte was prepared as follows:P(VdF-HFP)was dissolved in NMP(N-methyl pyrrolidone)and stirred for 4 h to get transparent solution.EMIPF6and LiPF6were added into the solution and stirred homogeneously for another 6 h.Then the solution was cast onto polytetrafluoroethylene(PTFE)plate and dried at 80°C for 24 h under vacuum to form a thin polymer film.After cooling down naturally to room temperature,the composite polymer P(VdF-HFP)/LiPF6/xEMIPF6(x=m(MIPF6)/m(LiPF6)=m(EMIPF6)/m(P(VdF-HFP)),was obtained.The mixed solvents of EC-PC were further added onto the surface of composite polymer(m(EC):m(PC)=1:1,m(EC-PC):m(P(VdF-HFP))=9:17)for modification.

    The scanning electron microscopy(SEM,KYKY-EM3200)was tested to observe morphology of the prepared composite polymer films.The thermal stability test was performed by thermogravimeter(TG,ZRY-2P).The flammability test was conducted by igniting the composite polymer to check the burning degree and time.

    The electrochemical stability window was performed by linear sweep voltammetry(LSV)technique with three-electrode cell at the rate of 0.5 mV s-1,where stainless steel(SS)was used as working electrode and metal lithium was used as both counter and reference electrodes.The ionic conductivities dependence of temperature(30-80°C)was measured by electrochemical impedance spectroscopy(EIS)with blocking cell(SS/composite polymer film/SS)in frequency range of 105-10-2Hz by electrochemical analyzer(CHI604b).The blocking cell was thermally equilibrated at each temperature for at least 2 h prior to measurements.The value of ion conductivity was calculated by following equation:σ=L/(Rb×S),where L is the thickness of the composite polymer film,S is the area of the electrode,and Rbis the bulk resistance accessed from Nyquist plots.Ion trans-ference numbers(t+)were determined by EIS and chronoamperometry(CA)with symmetric cell(Li/IL-gel film/Li)according to opening literature[16,24].The value was calculated by following equation:

    where,the subscripts“0”and“s”indicate initial values and steady-state values,Rbis the bulk resistance,Rfilmis the passive film resistance,ΔV is the applied bias potential(0.01 V),and i is the current.The values of all resistances were obtained from the EIS of symmetric cell before and after application of bias potential.

    The performance of selected LiCoO2or Li4Ti5O12was estimated with coin cell,where metal lithium was used as counter electrode and the prepared composite polymer film was used as both electrolyte and separator.The electrodes were prepared by casting slurry(80%(w)active powder,10%(w)acetylene black,10%(w)PVdF)on current collector(copper foil for Li4Ti5O12and aluminum foil for LiCoO2)and dried at 120°C for 10 h under vacuum.The electrodes were pressed and cut into disks as the research electrodes.Coin cells were assembled in argon-filled glove box and cycled within the voltage of 1-3 V(Li/Li4Ti5O12)or 2.7-4.2 V(Li/LiCoO2).

    2 Results and discussion

    Fig.1 shows the typical optical images of the composite polymer film P(VdF-HFP)/LiPF6/EMIPF6,which presents the flexible,freestanding and transparent features.The thickness of the films is tested to be 140-160 μm.

    Fig.2 is the SEM images of the composite polymer film P(VdF-HFP)/LiPF6/xEMIPF6.For x=0 in Fig.2(a),the surface of polymer film is found to be heterogeneous with heaves on surface,which is probably due to the incomplete miscibility between polymer and LiPF6.Small pores less than 5 μm are formed on most surfaces but partial surface is still imperforate,which is disadvantageous for ion transportation during electrochemical reaction.In Fig.2(b),the surface of polymer film becomes homogeneous with smooth surface,indicating that the addition of EMIPF6can enhance the solubility of LiPF6in polymer and facilitate the homogenization of polymer film.Micropores in size of 4-10μm are evidenced over the surface with the pore-wall thickness of 5-15μm.However,as the EIMPF6concentration increases to x=2,it is found in Fig.2(c)that the smooth surface of the polymer film is disappeared and becomes much rough with the decreased pores amounts.Partial pores are jammed by collapsed pore walls,which is tend to obstruct the movement of ions or reduce the mechanical strength of the polymer film.This morphology is adverse for satisfactory performance during long cycle life of batteries.Based on these analyses,further discussion was emphasized on P(VdFHFP)/LiPF6/EMIPF6(x=1).

    Fig.3 shows the electrochemical stability windows of the composite polymer film P(VdF-HFP)/LiPF6/EMIPF6(x=1)with or without EC-PC additives.Both stabilities on anodic and cathodic sides are present.On anodic side,the current onset is less sensitive to the EC-PC additives and the anodic stability is only enhanced a little from 4.1 to 4.3 V,which suggests that the obtained composite polymer electrolyte can besafely used in combination with most common cathode materials(such as LiCoO2,LiFePO4).On the cathodic side,however,the current onset is sensitive to EC-PC additives and for no EC-PC additives,the cathodic current starts to increase quickly from 1.5 V,indicating the decomposition of EMIPF6ionic liquid.This cathodic instability of EMIPF6ionic liquid has been reported elsewhere[25]and is attributed to the drawback of poor cathodic electrochemical stability caused by attacking to hydro-gen at C(2)carbo)site[26].After the presence of EC-PC,the cathodic stability is improved obviously.The current onset is retarded to 1.3 V and the subsequent cathodic current is much weaker than that of P(VdF-HFP)/LiPF6/EMIPF6.It is known that EC can also act as the solid electrolyte interface film(SEI film)formation solvent and thus it is reasonable to deduce that the addition of EC-PC forms a SEI film,which suppresses the reduction of EMIPF6ionic liquid and gives rise to a weak current.However,it seems that although the SEI film is formed,the decomposition of ionic liquid is not suppressed completely,because the cathodic current does not return to zero but still keeps increasing very slowly up to 0.3 V.Below 0.3 V,the cathodic current starts to increase relative quickly again,indicating an extended cathodic stability of 0.5 V is gained by addition of EC-PC.Considering rigorously,anode material with working voltage extended to 0 V should be excluded and relative high voltage anode material can be used(such as Li4Ti5O12).

    Fig.3 Electrochemical windows of the P(VdF-HFP)/LiPF6/EMIPF6(x=1)with or without EC-PC additives

    Table 1 shows the ionic conductivity(σ)dependence of P(VdF-HFP)/LiPF6/xEMIPF6(x=0,1)on temperature(30-80°C).Sample without ionic liquid(x=0)is present for comparison.It is seen that the ion conductivity is enhanced gradually as the temperature increases from 30 to 80 °C.For instance of 30 °C,theσof P(VdF-HFP)/LiPF6(x=0)is calculated to be 0.129mS·cm-1and improved pronouncedly to 1.295 mS·cm-1(x=1)by addition of EMIPF6ionic liquid,which is much higher than previously reportedσvalues for other gel polymer electrolytes[12-13,27].Effects of EC-PC onσare also investigated here and it is seen that the EC-PC additives can further improve the value ofσto 1.650mS·cm-1(x=1)due to the high dielectric constant of EC and PC.

    Table 1 Ion conductivity of P(VdF-HFP)/LiPF6/xEMIPF6with or without EC-PC additives

    The relationship between ionic conductivity(σ)and temperature is shown in Fig.4.For all samples,the logarithmic plots of ionic conductivityversus1/Tare approximated to Vogel-Tammann-Fulcher(VTF)equation(σ(T)=AT--0.5eB/T-T0)over the examined temperature range,whereAis the pre-exponential factor,T0=Tg-const(const=20-50 K),andBis a pseudo-activation energy for the charge-carrier motion.No abrupt changes are exhibited in the conductivityversustemperature plots,suggesting that these composite polymer films likely retain the same ionic conduction mechanism in the examined temperature range.

    Table 2 shows the cationic transference numbers(t+)of the composite polymer films.It is seen that P(VdF-HFP)/LiPF6possesses thet+of 0.529,which is reduced to 0.479 by addition of EMIPF6due to the relative high viscosity of ionic liquid.However,the value oft+is enhanced again to 0.547 by EC-PC additives.As is known,Li+cations move between the anode and cathode electrodes.However,the other ions in the electrolyte(i.e.,EMI+and P)are also mobile and may polarize a cell when current is passed.Ideally,all charges are carried by Li+which gives a Li transference number of unity(t+=1).In practice,most electrolytes have much lower values than unity due to other counter anions.By further application of equation:σLi+=t+×σ,the Li+conductivity can be obtained,which reflects the actual transport properties of Li+involved in electrochemical reactions.As is seen,a tiny Li+conductivity of 0.068 mS·cm-1is obtained in P(VdF-HFP)/LiPF6,indicating that most Li+ionsare blocked in polymer matrix and few can participate in the electrochemical reaction.However,the presence of EMIPF6ionic liquid(x=1)and EC-PC additives(x=1,with EC-PC)are both effective in improving the Li+conductivity to 0.620 and 0.902 mS·cm-1,which is suggested by other reports18],i.e.,addition of EC or PC additive can improve the properties of ion transport by virtue of high dielectric constant.Based on above discussion,P(VdF-HFP)/LiPF6/EMIPF6/EC-PC with the best ion transport properties is used as the electrolyte to assess the cell performance.

    Fig.4 Relationships between ionic conductivity and temperature

    Table 2 Transference numbers of P(VdF-HFP)/LiPF6/xEMIPF6with or without EC-PC additives

    Fig.5 shows the cycle performance of Li/Li4Ti5O12and Li/LiCoO2cell with P(VdF-HFP)/LiPF6/EMIPF6/EC-PC as electrolyte at different charge-discharge rates(0.1C,0.5C,1C,2C,5C).As is interpreted,Li/Li4Ti5O12exhibits the initial coulombic efficiency of 90%and stable reversible capacities at each rate.For instance,a stable reversible capacity 144 mAh·g-1is exhibited at 0.1Cand 107 mAh·g-1at 1C.As the charg-discharge rate is advanced to 5C,53%capacity is remained relative to initial capacity.In case of Li/LiCoO2,the initial coulombic efficiency is 89.6%and the reversible capacity of 130 mAh·g-1is given out at 0.1C.At 5C,the reversible capacity decreases to 56 mAh·g-1,i.e.,43%capacity relative to initial capacity.Seen from the battery performance,it is objective to say that the prepared P(VdF-HFP)/LiPF6/EMIPF6/EC-PC composite polymer electrolyte can be used in combination with high voltage cathode material or relative high voltage anode material and an acceptable electrochemical performance can be obtained compared with conventional organic liquid electrolyte.

    Fig.6 displays the TG analysis of P(VdF-HFP)/LiPF6/EMIPF6and P(VdF-HFP)/LiPF6/EMIPF6/EC-PC.LiPF6and EMIPF6are also present for comparison.As is shown,LiPF6salt starts to decompose at 173.1°C and a total mass loss of 78%is estimated up to 400.0°C.EMIPF6ionic liquid shows a high thermal stability and the mass loss occurs as high as 352.7 °C with a mass loss of 79%up to 400.0 °C,which is above the flash point of most common organic electrolyte(~200.0 °C)[28-29].Generally,P(VdF-HFP)polymer decomposes around 140.0°C[30],so in case of P(VdF-HFP)/LiPF6/EMIPF6,the first mass loss stage ranged in 133.3-198.6°C is mainly attributed to the decomposition of LiPF6salt and P(VdF-HFP)polymer(a mass loss of 33.5%).The second mass loss stage happens in range of 372.7-400.0°C,which is related to the decomposition of EMIPF6ionic liquid.After addition of EC-PC,the mass loss of 73%is mainly ranged in 145.0-194.8°C due to the decomposition of LiPF6salt,P(VdF-HFP)polymer,andEC-PC.Comparing the thermal properties between P(VdF-HFP)/LiPF6/EMIPF6and P(VdF-HFP)/LiPF6/EMIPF6/EC-PC,it is seen that the presence of EC-PC additives debases the thermal stability of the composite polymer film due to the low evaporation or decomposition temperature of EC and PC.

    Fig.7 presents the flammability tests of 1 mol·L-1LiPF6+EC/DEC/EMC(1:1:1,volume ratio),P(VdF-HFP)/LiPF6/EMIPF6and P(VdF-HFP)/LiPF6/EMIPF6/EC-PC.The results are summarized in Table 3.It is seen that 1 mol·L-1LiPF6+EC/DEC/EMC(1:1:1)electrolyte burns strongly for 10 s.In case of P(VdF-HFP)/LiPF6/EMIPF6,the non-inflammable feature is exhibited without burning phenomenon.However,incorporating the additives of EC-PC makes the composite polymer film flammable again but the weak burning and reduced burning time of 4 s are observed,indicating that the non-flammable EMIPF6ionic liquid may have a certain positive effect on suppressing the burning degree of P(VdF-HFP)/LiPF6/EMIPF6/EC-PC compared with 1 mol·L-1LiPF6+EC/DEC/EMC(1:1:1)electrolyte.

    Table 3 Results of flammability tests for different samples

    3 Conclusions

    In this study,P(VdF-HFP)composite polymer containing EMIPF6ionic liquid is reported and used as electrolyte for lithium ion batteries.The ion transport properties are improved greatly by addition of EMIPF6ionic liquid and EC-PC additives.On the other hand,EC-PC additives can extend the cathodic stability to 0.3 V by forming SEI film and an electrochemical stability window of 0.3-4.3 V can gain for P(VdF-HFP)/LiPF6/EMIPF6/EC-PC electrolyte.The selected Li4Ti5O12anode and LiCoO2cathode show acceptable battery performance,indicating the potential application of such composite polymer electrolyte in lithium ion batteries.However,the thermal stability is debased due to the relative low vapor or decomposition temperatures of EC-PC.

    1 Sung,M.G.;Hattori,K.;Asai,S.Materials and Design,2009,30:387

    2 Song,J.Y.;Wang,Y.Y.;Wan,C.C.J.Power Sources,1999,7:183

    3 Alper,J.Science,2002,296:1224

    4 Scrosati,B.;Croce,F.;Persi,L.J.Electrochem.Soc.,2000,147:1718

    5 Croce,F.;Appetecchi,G.B.;Persi,L.;Scrosati,B.Nature,1998,394:456

    6 Croce,F.;Curini,R.;Martinelli,A.;Persi,L.;Ronci,F.;Scrosati,B.;Caminiti,R.J.Phys.Chem.B,1999,103:10632

    7 Wieczorek,W.;Lipka,P.;Zukowska,G.;Wycislik,H.J.Phys.Chem.B,1998,102:6968

    8 Saito,Y.;Stephan,M.;Kataoka,H.Solid State Ionics,2003,16:149

    9 Forsyth,M.;Meakin,P.M.;MacFarlane,D.R.Electrochim.Acta,1995,40:2339

    10 Adebahr,J.;Forsyth,M.;MacFarlane,D.R.;Gavelin,P.;Jacobsson,P.Solid State Ionics,2002,14:303

    11 Noda,A.;Hayamizu,K.;Watanabe,M.J.Phys.Chem.B,2001,105:4603

    12 Tokuda,H.;Hayamizu,K.;Ishii,K.;Susan,M.A.B.H.;Watanabe,M.J.Phys.Chem.B,2004,108:16593

    13 Shin,J.H.;Henderson,W.A.;Passerini,S.Electrochem.Commun.,2003,5:1016

    14 Shin,J.H.;Henderson,W.A.;Appetecchi,G.B.;Alessandrini,F.;Passerini,S.Electrochim.Acta,2005,5:3859

    15 Cheng,H.;Zhu,C.;Huang,B.;Lu,M.;Yang,Y.Electrochim.Acta,2007,52:5789

    16 Fortunato,R.;Branco,L.C.C.;Afonso,A.M.;Benavente,J.;Crespo,J.G.J.Membrane Science,2006,270:42

    17 Fuller,J.;Breda,A.C.;Carlin,R.T.J.Electrochem.Soc.,1997,144:L67

    18 Fuller,J.;Breda,A.C.;Carlin,R.T.J.Electroanal.Chem.,1998,459:29

    19 Nishida,T.;Tashiro,Y.;Yamamoto,M.J.Fluorine Chem.,2003,120:135

    20 Hagiwara,R.;Hirashige,T.;Tsuda,T.;Ito,Y.J.Fluorine Chem.,1999,99:1

    21 Matsumoto,H.;Miyazakj,Y.Chem.Lett.,2000:922

    22 Bonh?te,P.;Dias,A.P.;Papageorgiou,N.;Kalyanasundaram,K.;Gr?tzel,M.Inorg.Chem.,1996,35:1168

    23 Ye,H.;Huang,J.;Xu,J.J.;Khalfan,A.;Greenbaum,S.G.J.Electrochem.Soc.,2007,154:A1048

    24 Evans,J.;Vincent,C.A.;Bruce,P.G.Polymer,1987,28:2324

    25 Zhang,S.M.;Hou,Y.W.;Huang,W.G.;Shan,Y.K.Electrochim.Acta,2005,50:4097

    26 Kim,K.S.;Park,S.Y.;Choi,S.;Lee,H.J.Power Sources,2006,155:385

    27 Tokuda,H.;Hayamizu,K.;Ishii,K.;Susan,M.A.B.H.;Watanabe,M.J.Phys.Chem.B,2005,109:6103

    28 Botte,G.G.;White,R.E.;Zhang,Z.M.J.Power Sources,2001,97-98:570

    29 Wang,Q.S.;Sun,J.H.;Yao,X.L.;Chen,C.H.Journal of Loss Prevention in the Process Industries,2006,19:561

    30 Saikia,D.;Kumar,A.Electrochim.Acta,2004,49:2581

    P(VdF-HFP)-基離子液體復合聚合物電解質(zhì)的陰極穩(wěn)定性及熱穩(wěn)定性

    崔聞宇 安茂忠*楊培霞 張錦秋

    (哈爾濱工業(yè)大學化工學院,哈爾濱150001)

    以聚偏氟乙烯-六氟丙烯P(VdF-HFP)聚合物為基體,制備了含離子液體1-甲基-3-乙基咪唑六氟磷酸鹽(EMIPF6)、用于鋰離子電池的離子液體復合聚合物電解質(zhì)[P(VdF-HFP)/LiPF6/EMIPF6/EC(碳酸乙烯酯)-PC(碳酸丙烯酯)].采用熱重分析法以及燃燒實驗測試了復合聚合物電解質(zhì)的熱穩(wěn)定性.離子電導率測試表明,離子液體的存在顯著改善了復合聚合物電解質(zhì)的離子傳輸;循環(huán)伏安測試表明,添加劑EC和PC的加入提高了復合電解質(zhì)的陰極穩(wěn)定性,制得的離子液體復合聚合物電解質(zhì)在0.3-4.3 V電壓范圍內(nèi)穩(wěn)定存在.Li4Ti5O12和LiCoO2為電極材料、P(VdF-HFP)/LiPF6/EMIPF6/EC-PC為電解質(zhì)的半電池表現(xiàn)出優(yōu)良的循環(huán)性能,0.1C充放電倍率下,Li/LiCoO2和Li/Li4Ti5O12半電池的可逆容量分別為130和144 mAh·g-1.但EC、PC在一定程度上降低了離子液體復合聚合物電解質(zhì)的熱穩(wěn)定性.

    鋰離子電池;離子液體;復合聚合物電解質(zhì);陰極穩(wěn)定性;熱穩(wěn)定性

    O646

    Received:September 20,2010;Revised:October 28,2010;Published on Web:November 25,2010.

    ?Corresponding author.Email:mzan@hit.edu.cn;Tel/Fax:+86-451-86413721.

    The project was supported by the Natural Science Foundation of Heilongjiang Province,China(B2007-05).

    黑龍江省自然科學基金(B2007-05)資助項目

    猜你喜歡
    熱穩(wěn)定性丙烯陰極
    錢愛康
    揚子江詩刊(2023年3期)2023-05-06 10:40:14
    《共生》主題系列作品
    大眾文藝(2022年16期)2022-09-07 03:08:04
    Evaluation of Arctic Sea Ice Drift and its Relationship with Near-surface Wind and Ocean Current in Nine CMIP6 Models from China
    苯丙烯菌酮
    場發(fā)射ZrO/W肖特基式場發(fā)射陰極研究進展
    電子制作(2018年12期)2018-08-01 00:47:46
    PVC用酪氨酸鑭的合成、復配及熱穩(wěn)定性能研究
    中國塑料(2016年7期)2016-04-16 05:25:52
    液化氣中的丙烯含有的雜質(zhì)對丙烯聚合反應(yīng)的影響
    提高有機過氧化物熱穩(wěn)定性的方法
    可聚合松香衍生物的合成、表征和熱穩(wěn)定性?
    IT-SOFCs陰極材料Sm0.8La0.2Ba1-xSrxFe2O5+δ的制備與表征
    亚洲欧美中文字幕日韩二区| 嘟嘟电影网在线观看| 在线观看美女被高潮喷水网站| 人体艺术视频欧美日本| 新久久久久国产一级毛片| 男人爽女人下面视频在线观看| 国产欧美另类精品又又久久亚洲欧美| freevideosex欧美| 波野结衣二区三区在线| 不卡视频在线观看欧美| 精品国产国语对白av| 亚洲欧美成人综合另类久久久| 久久精品国产亚洲av涩爱| 久久国产精品男人的天堂亚洲 | 免费黄网站久久成人精品| 亚洲四区av| 国模一区二区三区四区视频| 青青草视频在线视频观看| 久久久亚洲精品成人影院| 国产精品伦人一区二区| 一级毛片电影观看| 免费人妻精品一区二区三区视频| 欧美日韩一区二区视频在线观看视频在线| 大又大粗又爽又黄少妇毛片口| 午夜福利影视在线免费观看| 国产亚洲最大av| 美女国产视频在线观看| 夜夜看夜夜爽夜夜摸| 国产精品.久久久| 亚洲久久久国产精品| 欧美精品高潮呻吟av久久| 久久久久久久大尺度免费视频| 简卡轻食公司| 亚洲精品久久午夜乱码| 五月玫瑰六月丁香| 99久久中文字幕三级久久日本| 最新中文字幕久久久久| 一级,二级,三级黄色视频| 亚洲人成网站在线播| 多毛熟女@视频| 桃花免费在线播放| 国产熟女午夜一区二区三区 | 99热这里只有是精品在线观看| 最近中文字幕高清免费大全6| 一级毛片 在线播放| 亚洲精品aⅴ在线观看| www.av在线官网国产| 久热这里只有精品99| 欧美精品亚洲一区二区| 亚洲精品国产色婷婷电影| 少妇人妻一区二区三区视频| 成人免费观看视频高清| tube8黄色片| 久久精品国产亚洲网站| 欧美性感艳星| 十分钟在线观看高清视频www | 蜜桃在线观看..| 91成人精品电影| 美女视频免费永久观看网站| 精品一区在线观看国产| 久久久午夜欧美精品| 亚洲电影在线观看av| 免费观看在线日韩| 永久免费av网站大全| 久久鲁丝午夜福利片| 欧美+日韩+精品| 亚洲精品一二三| 欧美老熟妇乱子伦牲交| 中国美白少妇内射xxxbb| 亚洲成人手机| 国产精品秋霞免费鲁丝片| 亚洲电影在线观看av| 国产av精品麻豆| 欧美区成人在线视频| 欧美日本中文国产一区发布| 男人狂女人下面高潮的视频| 亚洲婷婷狠狠爱综合网| 欧美精品国产亚洲| 成人亚洲精品一区在线观看| 精品人妻熟女毛片av久久网站| 国产一区二区三区综合在线观看 | 中文欧美无线码| 亚洲真实伦在线观看| 亚洲精品视频女| a级毛片在线看网站| 国产在线免费精品| 人妻一区二区av| 一级毛片aaaaaa免费看小| 亚洲第一av免费看| 新久久久久国产一级毛片| 天堂8中文在线网| 国产男人的电影天堂91| 国产熟女午夜一区二区三区 | 人人妻人人澡人人爽人人夜夜| 国产精品人妻久久久久久| 观看免费一级毛片| 香蕉精品网在线| 国产中年淑女户外野战色| 中文字幕精品免费在线观看视频 | 午夜视频国产福利| 免费少妇av软件| 秋霞伦理黄片| 九草在线视频观看| 国产日韩欧美亚洲二区| 韩国高清视频一区二区三区| 久久国内精品自在自线图片| 嫩草影院新地址| 欧美国产精品一级二级三级 | 国产成人aa在线观看| 99九九在线精品视频 | 亚洲丝袜综合中文字幕| 亚洲图色成人| 丰满饥渴人妻一区二区三| 女性被躁到高潮视频| 卡戴珊不雅视频在线播放| 一级毛片电影观看| 国产精品国产三级国产av玫瑰| 99热国产这里只有精品6| 亚洲av欧美aⅴ国产| 午夜福利在线观看免费完整高清在| 成年美女黄网站色视频大全免费 | h日本视频在线播放| 国产深夜福利视频在线观看| 老司机亚洲免费影院| 一二三四中文在线观看免费高清| 亚洲婷婷狠狠爱综合网| 男人和女人高潮做爰伦理| 久久久久网色| 亚洲国产精品成人久久小说| 欧美日韩av久久| 欧美日韩亚洲高清精品| 一级爰片在线观看| 在线播放无遮挡| 日日摸夜夜添夜夜添av毛片| a级毛色黄片| 日韩亚洲欧美综合| 亚洲综合精品二区| 51国产日韩欧美| 婷婷色av中文字幕| 国产亚洲av片在线观看秒播厂| 99久久精品国产国产毛片| 偷拍熟女少妇极品色| 亚洲av电影在线观看一区二区三区| 中文字幕av电影在线播放| 99热网站在线观看| 欧美精品国产亚洲| 午夜免费鲁丝| 在线 av 中文字幕| 日韩一区二区三区影片| 天堂俺去俺来也www色官网| 纯流量卡能插随身wifi吗| 99久久人妻综合| 自线自在国产av| 在线观看免费视频网站a站| 亚洲欧美日韩东京热| 高清午夜精品一区二区三区| 日韩欧美 国产精品| 永久免费av网站大全| 欧美变态另类bdsm刘玥| 99久久人妻综合| h视频一区二区三区| 色5月婷婷丁香| 高清黄色对白视频在线免费看 | 少妇人妻久久综合中文| 亚洲国产精品专区欧美| 99久久中文字幕三级久久日本| 七月丁香在线播放| 亚州av有码| 九色成人免费人妻av| 九色成人免费人妻av| 亚洲内射少妇av| 久久99热这里只频精品6学生| 一本久久精品| 亚洲婷婷狠狠爱综合网| 午夜福利视频精品| 亚洲国产色片| 少妇 在线观看| 国产美女午夜福利| 欧美精品亚洲一区二区| 国产 精品1| 国产精品99久久99久久久不卡 | www.av在线官网国产| 黄色配什么色好看| 亚洲久久久国产精品| 一个人看视频在线观看www免费| 亚洲性久久影院| 国产探花极品一区二区| 久久久久国产网址| av有码第一页| 老司机影院毛片| av福利片在线观看| 国产有黄有色有爽视频| 国产av码专区亚洲av| 高清午夜精品一区二区三区| 男女啪啪激烈高潮av片| 在线观看免费高清a一片| 狠狠精品人妻久久久久久综合| 99久久人妻综合| 国产在线男女| av有码第一页| 成年美女黄网站色视频大全免费 | 亚洲精品一区蜜桃| h视频一区二区三区| av福利片在线观看| 中文欧美无线码| 日韩av免费高清视频| 成人18禁高潮啪啪吃奶动态图 | 大话2 男鬼变身卡| 这个男人来自地球电影免费观看 | 日韩一区二区三区影片| 成人美女网站在线观看视频| 国产精品人妻久久久久久| 成年人免费黄色播放视频 | a级毛片在线看网站| 亚洲精品日韩在线中文字幕| 国产一区二区在线观看av| 免费大片18禁| av国产精品久久久久影院| 亚洲,一卡二卡三卡| 一本大道久久a久久精品| 久久综合国产亚洲精品| 色婷婷av一区二区三区视频| 这个男人来自地球电影免费观看 | 观看美女的网站| av在线播放精品| 精品国产国语对白av| 男人爽女人下面视频在线观看| 欧美日韩av久久| 天堂俺去俺来也www色官网| 丝袜喷水一区| 亚洲人成网站在线观看播放| 国产精品人妻久久久久久| 99re6热这里在线精品视频| 色5月婷婷丁香| 十八禁网站网址无遮挡 | 少妇丰满av| 五月玫瑰六月丁香| 久久人人爽av亚洲精品天堂| 嫩草影院新地址| 又粗又硬又长又爽又黄的视频| 色吧在线观看| 亚洲精品国产成人久久av| 2021少妇久久久久久久久久久| 欧美日韩亚洲高清精品| 赤兔流量卡办理| 日本黄色日本黄色录像| 欧美三级亚洲精品| 免费观看a级毛片全部| 一级a做视频免费观看| 国产免费一区二区三区四区乱码| 简卡轻食公司| 国产色爽女视频免费观看| 日韩,欧美,国产一区二区三区| 黄片无遮挡物在线观看| 中文欧美无线码| 中国三级夫妇交换| 多毛熟女@视频| 国产综合精华液| 国内精品宾馆在线| 久久久久久久久久久丰满| 亚洲,欧美,日韩| 国产女主播在线喷水免费视频网站| av网站免费在线观看视频| 91aial.com中文字幕在线观看| 一本色道久久久久久精品综合| 一级二级三级毛片免费看| 大片免费播放器 马上看| 秋霞在线观看毛片| 男人添女人高潮全过程视频| 国产有黄有色有爽视频| 最新中文字幕久久久久| 97在线视频观看| 亚洲真实伦在线观看| 99九九线精品视频在线观看视频| 91在线精品国自产拍蜜月| 丰满饥渴人妻一区二区三| 久久久精品免费免费高清| 亚洲电影在线观看av| 菩萨蛮人人尽说江南好唐韦庄| 嫩草影院新地址| 日本欧美国产在线视频| 久久99热6这里只有精品| 国产乱人偷精品视频| 少妇的逼水好多| 久久久久久久久久久免费av| 国内少妇人妻偷人精品xxx网站| 一区在线观看完整版| 国产一区亚洲一区在线观看| 丰满迷人的少妇在线观看| 一级毛片我不卡| 97精品久久久久久久久久精品| 在线亚洲精品国产二区图片欧美 | 国产成人a∨麻豆精品| 黄色视频在线播放观看不卡| 在线亚洲精品国产二区图片欧美 | 99久久人妻综合| 欧美一级a爱片免费观看看| 最近中文字幕2019免费版| 亚洲天堂av无毛| 国产一区二区三区av在线| 亚洲精品乱久久久久久| 91aial.com中文字幕在线观看| 精品一区二区免费观看| 国产精品一区二区在线不卡| 国产 精品1| 久久久精品免费免费高清| 中文天堂在线官网| 男女国产视频网站| 国产精品一区www在线观看| 久久精品国产亚洲av天美| 亚洲在久久综合| 午夜日本视频在线| 国产高清国产精品国产三级| 国产美女午夜福利| 少妇被粗大的猛进出69影院 | 国产欧美亚洲国产| 美女脱内裤让男人舔精品视频| 少妇人妻一区二区三区视频| 天美传媒精品一区二区| 日韩一区二区三区影片| 亚洲,欧美,日韩| 日本与韩国留学比较| 久久热精品热| 久久国产乱子免费精品| 99九九线精品视频在线观看视频| 麻豆成人午夜福利视频| 成人午夜精彩视频在线观看| 在线看a的网站| 十分钟在线观看高清视频www | 欧美丝袜亚洲另类| 十八禁网站网址无遮挡 | 亚洲国产色片| 午夜免费观看性视频| 久久热精品热| 少妇的逼好多水| 久久午夜福利片| 成人综合一区亚洲| 亚洲激情五月婷婷啪啪| 免费大片18禁| 国产乱人偷精品视频| 老司机影院毛片| 一本—道久久a久久精品蜜桃钙片| 亚洲综合精品二区| 久久久久久久亚洲中文字幕| 亚洲欧美精品自产自拍| 亚州av有码| 性色avwww在线观看| 国产91av在线免费观看| 精品人妻熟女毛片av久久网站| 日本av免费视频播放| 久久韩国三级中文字幕| 极品少妇高潮喷水抽搐| 成人毛片60女人毛片免费| 搡老乐熟女国产| 免费在线观看成人毛片| 黄色欧美视频在线观看| 日本-黄色视频高清免费观看| 久久久久久久久大av| 好男人视频免费观看在线| 亚洲图色成人| 国产精品一区二区在线观看99| 亚洲天堂av无毛| 最近中文字幕高清免费大全6| 成人二区视频| 不卡视频在线观看欧美| 永久网站在线| 国产成人免费观看mmmm| av在线老鸭窝| 久久国产精品大桥未久av | 嫩草影院入口| 欧美 日韩 精品 国产| 在线播放无遮挡| 亚洲精品视频女| 国产精品三级大全| 最近2019中文字幕mv第一页| 日韩精品免费视频一区二区三区 | 日韩不卡一区二区三区视频在线| 久久97久久精品| 三级国产精品片| 亚洲国产毛片av蜜桃av| 免费大片黄手机在线观看| 成人国产麻豆网| 亚洲欧美清纯卡通| 80岁老熟妇乱子伦牲交| 蜜臀久久99精品久久宅男| 久久6这里有精品| 精品99又大又爽又粗少妇毛片| 久久女婷五月综合色啪小说| 国产欧美日韩综合在线一区二区 | 妹子高潮喷水视频| 波野结衣二区三区在线| 黑人高潮一二区| 热99国产精品久久久久久7| 免费黄网站久久成人精品| 精品少妇黑人巨大在线播放| freevideosex欧美| 亚洲情色 制服丝袜| 中文字幕免费在线视频6| 日本-黄色视频高清免费观看| 国产精品欧美亚洲77777| 妹子高潮喷水视频| 久久久久久久久久久免费av| 欧美日韩视频精品一区| 美女xxoo啪啪120秒动态图| 人妻系列 视频| 岛国毛片在线播放| 日韩不卡一区二区三区视频在线| 成人无遮挡网站| 国产色爽女视频免费观看| 亚洲精品日韩在线中文字幕| 久久99热这里只频精品6学生| 十八禁高潮呻吟视频 | 欧美日韩视频高清一区二区三区二| 狠狠精品人妻久久久久久综合| 中文字幕人妻丝袜制服| 久久久精品94久久精品| 韩国高清视频一区二区三区| 看十八女毛片水多多多| 日韩三级伦理在线观看| 最近2019中文字幕mv第一页| 欧美日本中文国产一区发布| 中国三级夫妇交换| 国产中年淑女户外野战色| 精品少妇黑人巨大在线播放| 色婷婷av一区二区三区视频| 高清欧美精品videossex| 成人综合一区亚洲| 蜜臀久久99精品久久宅男| 一区二区三区四区激情视频| 新久久久久国产一级毛片| 男女啪啪激烈高潮av片| 91精品伊人久久大香线蕉| 婷婷色av中文字幕| 久久久国产精品麻豆| 亚洲av.av天堂| 麻豆成人午夜福利视频| 午夜福利,免费看| 日韩中字成人| 欧美日韩国产mv在线观看视频| 欧美一级a爱片免费观看看| 2022亚洲国产成人精品| 91久久精品国产一区二区成人| av在线app专区| 日本黄大片高清| 亚洲精品国产色婷婷电影| 中文字幕亚洲精品专区| 国产成人精品无人区| 偷拍熟女少妇极品色| 精品99又大又爽又粗少妇毛片| 精品国产一区二区三区久久久樱花| 777米奇影视久久| 久久人人爽人人片av| 人妻制服诱惑在线中文字幕| 亚洲国产av新网站| 成年人午夜在线观看视频| 亚洲精品一二三| 亚洲天堂av无毛| 插阴视频在线观看视频| 成人午夜精彩视频在线观看| 69精品国产乱码久久久| 18禁在线无遮挡免费观看视频| 精品久久久噜噜| 只有这里有精品99| 精品卡一卡二卡四卡免费| 中文字幕久久专区| 亚洲美女黄色视频免费看| 王馨瑶露胸无遮挡在线观看| 男女无遮挡免费网站观看| 91aial.com中文字幕在线观看| 91精品伊人久久大香线蕉| 免费看不卡的av| 日韩三级伦理在线观看| 99热这里只有是精品在线观看| 少妇人妻 视频| 免费播放大片免费观看视频在线观看| 一本大道久久a久久精品| 熟女av电影| 国产成人免费观看mmmm| 欧美xxxx性猛交bbbb| 日本黄色日本黄色录像| 国内揄拍国产精品人妻在线| 亚洲精品第二区| 国产熟女欧美一区二区| 赤兔流量卡办理| 成人国产麻豆网| 三级国产精品片| 一级毛片黄色毛片免费观看视频| 综合色丁香网| av在线老鸭窝| 一区在线观看完整版| 简卡轻食公司| 免费av不卡在线播放| 一级毛片电影观看| 欧美一级a爱片免费观看看| 一区在线观看完整版| 97精品久久久久久久久久精品| 国产有黄有色有爽视频| 黄色毛片三级朝国网站 | 久久精品久久久久久噜噜老黄| 熟女人妻精品中文字幕| 国产黄片美女视频| 亚洲精品国产色婷婷电影| 在线观看人妻少妇| 看非洲黑人一级黄片| 少妇 在线观看| 欧美区成人在线视频| 亚洲欧洲精品一区二区精品久久久 | 久久久亚洲精品成人影院| 欧美日韩国产mv在线观看视频| 尾随美女入室| av又黄又爽大尺度在线免费看| 在线亚洲精品国产二区图片欧美 | 久久久久久久久久人人人人人人| 成人18禁高潮啪啪吃奶动态图 | 国产成人a∨麻豆精品| 久久久欧美国产精品| 国产欧美另类精品又又久久亚洲欧美| 婷婷色av中文字幕| 国产永久视频网站| 亚洲综合精品二区| 黄色配什么色好看| 久久久久人妻精品一区果冻| 精品久久久噜噜| 草草在线视频免费看| 性色av一级| 永久免费av网站大全| 中文字幕精品免费在线观看视频 | 国产日韩一区二区三区精品不卡 | 青春草亚洲视频在线观看| 涩涩av久久男人的天堂| 国产黄频视频在线观看| 亚洲欧美清纯卡通| 免费大片黄手机在线观看| 亚洲精品国产成人久久av| tube8黄色片| 又大又黄又爽视频免费| 国产精品99久久99久久久不卡 | 免费高清在线观看视频在线观看| av不卡在线播放| 欧美人与善性xxx| 人人妻人人澡人人看| 麻豆乱淫一区二区| 夜夜看夜夜爽夜夜摸| 九色成人免费人妻av| 三上悠亚av全集在线观看 | 99久久精品国产国产毛片| 国产成人一区二区在线| 国产亚洲欧美精品永久| 国产在线一区二区三区精| 美女主播在线视频| 建设人人有责人人尽责人人享有的| 久久免费观看电影| 简卡轻食公司| 亚洲av日韩在线播放| 日本欧美国产在线视频| 亚洲欧美精品自产自拍| 婷婷色综合www| 亚洲av二区三区四区| 久久精品久久精品一区二区三区| 蜜桃在线观看..| 97在线视频观看| 免费人成在线观看视频色| 亚洲精品色激情综合| 国产亚洲av片在线观看秒播厂| www.色视频.com| 又爽又黄a免费视频| 日韩制服骚丝袜av| 三上悠亚av全集在线观看 | 国产精品熟女久久久久浪| 看十八女毛片水多多多| 午夜免费鲁丝| 亚洲精品一二三| 成人特级av手机在线观看| 在线观看免费视频网站a站| 2018国产大陆天天弄谢| 久久狼人影院| 午夜激情久久久久久久| 青春草视频在线免费观看| 国产国拍精品亚洲av在线观看| 男女无遮挡免费网站观看| 丰满人妻一区二区三区视频av| 十八禁高潮呻吟视频 | 少妇熟女欧美另类| 亚洲精品亚洲一区二区| 久久精品夜色国产| 日韩av在线免费看完整版不卡| 国产精品久久久久久精品电影小说| 一级毛片黄色毛片免费观看视频| 国产精品久久久久久av不卡| 国产黄片美女视频| 毛片一级片免费看久久久久| 人人妻人人澡人人爽人人夜夜| 91精品伊人久久大香线蕉| 国产白丝娇喘喷水9色精品| 亚洲成人手机| 天堂中文最新版在线下载| 国产淫片久久久久久久久| 美女大奶头黄色视频| 一本一本综合久久| 伊人亚洲综合成人网| 亚洲欧美一区二区三区国产| 边亲边吃奶的免费视频| 欧美 亚洲 国产 日韩一| 成年美女黄网站色视频大全免费 | 午夜免费鲁丝| 久久精品国产亚洲av涩爱| 日本爱情动作片www.在线观看| 国产成人freesex在线| 91在线精品国自产拍蜜月| 国产成人精品福利久久| av卡一久久| 人体艺术视频欧美日本| 性色avwww在线观看| 永久网站在线| 水蜜桃什么品种好|