马玉林,高云智,左朋建,程新群,尹鸽平

• 1:哈尔滨工业大学化工学院
• 2:哈尔滨工业大学城市水资源与水环境国家重点实验室

摘要(Abstract)：

研究了磷酸三苯酯(TPP)含量对1mol·L-1LiPF6/EC:DEC:EMC(1:1:1)+1.5%VC电解液的电化学稳定性、热稳定性及电导率的影响,结果表明:10%以下TPP添加剂的引入提高了电解液的热稳定性,几乎不影响电解液的电化学窗口,但是该添加剂降低了电解液的电导率。研究了TPP对方型电池的电化学性能及安全性的影响,充放电测试结果表明,TPP的使用会降低电池的循环性能,6%以下的TPP含量对电池的循环性能影响较小;热冲击、针刺及过充安全性测试结果表明,4%～8%含量的TPP能够改善电池的150℃热冲击能力,降低针刺过程中电池的表面温度,提高了锂离子电池的安全性。此外,交流阻抗(EIS)、扫描电镜(SEM)及X射线光电子能谱(XPS)分析表明,TPP对循环性能影响的主要原因是正负极表面过多SEI膜的形成及负极片的部分破裂。

关键词(KeyWords)： 锂离子电池;电解液;阻燃添加剂;电化学性能;安全性

Abstract:

Keywords:

基金项目(Foundation): 国家563计划资助项目(2009AA11AA105)

作者(Author): 马玉林,高云智,左朋建,程新群,尹鸽平

参考文献(References)：

• [1]ZUO Peng-jian(左朋建),YIN Ge-ping(尹鸽平).Si-Mn composite anode used for Li-ion battery(锂离子电池用Si-Mn复合电极的研究)[J].J Chem Eng of Chinese Univ(高校化学工程学报),2006,20(4):634-637.
• [2]Wu L,Song Z P,Liu L S,et al.A new phosphate-based nonflammable electrolyte solvent for Li-ion batteries[J].J Power Sources,2009,188(2):570-573.
• [3]Xiang H F,Xu H Y,Wang Z Z,et al.Dimethyl methylphosphonate(DMMP)as an efficient flame retardant additive for the lithium-ion battery electrolytes[J].J Power Sources,2007,173(1):562-564.
• [4]Wang Q S,Sun J H.Enhancing the safety of lithium ion batteries by4-isopropyl phenyl diphenyl phosphate[J].Materials Lett,2007,61(16):3338-3340.
• [5]Fei S-T,Harry R A,Methoxyethoxyethoxyphosphazenes as ionic conductive fire retardant additives for lithium battery systems[J].J Power Sources,2010,195(7):2082-2088.
• [6]Shim E G,Nam T H,Kim J G,et al.Effect of the concentration of diphenyloctyl phosphate as a flame-retarding additive on the electrochemical performance of lithium-ion batteries[J].Electrochim Acta,2009,54(24):2276-2283.
• [7]Zhang S S,Xu K,Jow T R.Tris(2,2,2-trifluoroethyl)phosphite as a co-solvent for nonflammable electrolytes in Li-ion batteries[J].J Power Sources,2003,113(1):166-172.
• [8]Xiang H F,Lin H W,Yin B,et al.Effect of activation at elevated temperature on Li-ion batteries with flame-retarded electrolytes[J].J Power Sources,2010,195(1):335-340.
• [9]Doughty D H,Roth E P,Crafts C C,et al.Effects of additives on thermal stability of Li ion cells[J].J Power Sources,2005,146(1-2):116-120.
• [10]Hyung Y E,Vissers D R,Amine K,Flame-retardant additives for lithium-ion batteries[J].J Power Sources,2003,119-121:383-387(特刊Sp.Iss.SI).
• [11]Shim E G,Nam T H,Kim J G,et al.Electrochemical performance of lithium-ion batteries with triphenylphosphate as a flame-retardant additive[J].J Power Sources,2007,172(2):919-924.
• [12]Guo R,Shi P,Cheng X,et al.Effect of ZnO modification on the performance of LiNi0.5Co0.25Mn0.25O2cathode material[J].Electrochim Acta,2009,54(24):5796-5803.
• [13]Wu M S,Chiang P J,Lin J C,et al.Correlation between electrochemical characteristics and thermal stability of advanced lithium-ion batteries in abuse tests-short-circuit tests[J].Electrochim Acta,2004,49(11):1803-1812.
• [14]Wang Y D,Jiang J W,Dahn J R.The reactivity of delithiated LiNi1/3Co1/3Mn1/3O2,LiNi0.8Co0.15Al0.05O2or LiCoO2with non-aqueous electrolyte[J].Electrochem Commun,2007,9(10):2534-2540.