摘要
研究了碳酸亚乙烯酯(VC)作为添加剂对聚合物锂离子电池性能的影响.发现聚合物锂离子电池有机电解液中加VC以后,降低了电池的内阻,提高了循环性能与高低温放电性能.循环伏安的测试结果表明,VC加入以后,电位在-1.5^-2.0 V出现了一个可逆峰,使得电池的初期不可逆容量降低.交流阻抗测试结果证明,VC的加入降低了碳电极界面电阻、电荷传递反应电阻以及溶液扩散电阻,使锂离子的迁移变得容易;同时提高了SEI膜的致密性,从而改善了电池的性能.
Vinylene Carbonate （VC） is an important additive to electrolyte of lithium ion battery, and the effect on the performance of polymer lithium ion battery was studied in this paper. It was found that the internal resistance of battery was reduced and the cycle performance and discharge performance at higher and lower temperature was improved after VC was added into organic electrolyte of polymer lithium ion battery. It was demonstrated through cyclic vohammetry that one reversible peak appeared at the voltage region - 1.5 - - 2. 0V and the initial irreversible capacity of battery was reduced after the addition of VC. It was also showed by the results of AC impedance that the addition of VC decreased the resistance of interface,charge transfer reaction and diffusion in solution and made the migration of lithium ion easier. Further more, it increased the density of SEI film, so the performance of battery was improved.
出处
《哈尔滨工业大学学报》
EI
CAS
CSCD
北大核心
2007年第1期145-148,共4页
Journal of Harbin Institute of Technology
