首页 | 本学科首页   官方微博 | 高级检索  
     检索      

丁磺酸内酯对锂离子电池性能及负极界面的影响
引用本文:许梦清,左晓希,李伟善,周豪杰,刘建生,袁中直.丁磺酸内酯对锂离子电池性能及负极界面的影响[J].物理化学学报,2006,22(3):335-340.
作者姓名:许梦清  左晓希  李伟善  周豪杰  刘建生  袁中直
作者单位:Department of Chemistry, South China Normal University, Guangzhou 510006, P. R. China
基金项目:国家自然科学基金(20373016),广东省重大专项(2004A11001001),广州市重点项目(2004Z3-D0091)资助
摘    要:用循环伏安(CV)、电化学阻抗谱(EIS)、扫描电镜(SEM)、能谱分析(EDS)及理论计算等方法研究了添加剂丁磺酸内酯(BS)对锂离子电池负极界面性质的影响. 研究表明, 在初次循环过程中, BS具有较低的最低空轨道能量, 优先于溶剂在石墨电极上还原分解, 并形成固体电解质相界面膜(SEI膜). 在含BS的电解液中形成的SEI膜的热稳定性高, 在70 ℃下储存24 h后, 膜电阻和电荷迁移电阻大小基本保持不变, 而在不含BS的电解液中形成的SEI膜的热稳定性较差, 在70 ℃下储存24 h后, 膜电阻和电荷迁移电阻大小有明显的增加. 从BS对锂离子电池电化学性能影响的研究表明, 加入少量的BS能够显著提高锂离子电池的室温放电容量、低温及高温储存放电性能.

关 键 词:锂离子电池  丁磺酸内酯  放电容量  循环稳定性  固体电解质相界面膜  
收稿时间:2005-09-08
修稿时间:2005-09-082005-11-10

Effect of Butyl Sultone on the Li-ion Battery Performance and Interface of Graphite Electrode
XU,Meng-Qing,ZUO,Xiao-Xi,LI,Wei-Shan,ZHOU,Hao-Jie,LIU,Jian-Sheng,YUAN,Zhong-Zhi.Effect of Butyl Sultone on the Li-ion Battery Performance and Interface of Graphite Electrode[J].Acta Physico-Chimica Sinica,2006,22(3):335-340.
Authors:XU  Meng-Qing  ZUO  Xiao-Xi  LI  Wei-Shan  ZHOU  Hao-Jie  LIU  Jian-Sheng  YUAN  Zhong-Zhi
Institution:Department of Chemistry, South China Normal University, Guangzhou 510006, P. R. China
Abstract:Effect of butyl sultone (BS) on the graphite interface of lithium ion battery in carbonate-based electrolytes is studied by cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), as well as the density functional theory (DFT) calculation. The results indicate that BS has lower LUMO energy than the solvents and is reduced prior to solvent compositions of the electrolyte on graphite electrode, forming a stable solid electrolyte interface (SEI) film during the first cycle. The SEI film resistance and the charge transfer resistance of graphite electrode in BS containing solution change little after storage at 70 ℃ for 24 h, while those in BS-free solution increase significantly. The influence of BS on the electrochemical performance was also discussed. It was found that the discharge capacities at room temperature, low temperature and after high temperature storage were significantly improved due to the presence of BS.
Keywords:Li-ion battery  Butyl sultone  Discharge capacity  Cyclic stability  SEI film
本文献已被 CNKI 维普 万方数据 等数据库收录!
点击此处可从《物理化学学报》浏览原始摘要信息
点击此处可从《物理化学学报》下载免费的PDF全文
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号