物理化学学报 >> 2006, Vol. 22 >> Issue (11): 1336-1341.doi: 10.3866/PKU.WHXB20061107

研究论文 上一篇    下一篇

Sb2O3掺杂Li4Ti5O12的电化学性能

徐宇虹;张宝宏;巩桂英;马萍   

  1. 哈尔滨工程大学化工学院,哈尔滨 150001
  • 收稿日期:2006-03-15 修回日期:2006-05-31 发布日期:2006-11-06
  • 通讯作者: 张宝宏 E-mail:x8y1h73@163.com

Electrochemical Properties Study of Sb2O3 doped Li4Ti5O12

XU Yu-Hong;ZHANG Bao-Hong;GONG GUI-Ying;MA Ping   

  1. Chemical Engineering School of Harbin Engineering University, Harbin 150001, P. R. China
  • Received:2006-03-15 Revised:2006-05-31 Published:2006-11-06
  • Contact: ZHANG Bao-Hong E-mail:x8y1h73@163.com

摘要: 采用Sb2O3掺杂改性Li4Ti5O12.用恒流充放电、循环伏安和交流阻抗技术对样品的电化学性能进行了测试.结果显示,当Ti:Sb=4:1时,首次放电容量高达595.84mAhog-1,首次的库仑效率为45.7%,存在不可逆容量损失.提出了可能的反应机理,并用该机理解释了影响容量衰减的因素.经过20次充放电循环后,容量保持在249.57 mAhog-1.电化学阻抗谱表明,Sb的掺杂使得电化学反应阻抗减小了.

关键词: 锂离子电池, Li4Ti5O12, 掺杂, 负极材料

Abstract: Li4Ti5O12 was modified by doped Sb2O3. The samples were characterized by galvanostatic charge-discharge,cyclic voltammetry(CV) and electrochemical impedance spectroscopy(EIS). The results indicated that the initial capacity was as high as 595.84mAhog-1 and the colombic efficiency was 45.7%when Ti:Sb=4:1. The capacity was still 249.57mAhog-1 after 20 charge-discharge cycles. The possible reaction mechanism was proposed and used to explained the losses of capacity. EIS results showed that Sb-doping could suppressed the electrochemical reaction resistant.

Key words: Lithium ion battery, Li4Ti5O12, Doping, anode material