物理化学学报 >> 2007, Vol. 23 >> Issue (Supp): 46-50.doi: 10.3866/PKU.WHXB2007Supp11

研究论文 上一篇    下一篇

C/LiNi1/3Co1/3Mn1/3O2体系的放电性能

王剑; 祁毓俊; 李永伟; 其鲁   

  1. 中信国安盟固利新能源科技有限公司, 北京 102200; 北京大学化学与分子工程学院应用化学系新能源材料与技术实验室, 北京 100871
  • 收稿日期:1900-01-01 修回日期:1900-01-01 发布日期:2008-01-04
  • 通讯作者: 其鲁 E-mail:qilu@pku.edu.cn

Discharge Performances of C/LiNi1/3Co1/3Mn1/3O2

WANG Jian; QI Yu-Jun; LI Yong-Wei; QI Lu

  

  1. CITIC Guoan Mengguli New Energy Technology Co. Ltd., Beijing 102200, P. R. China; New Energy Materials and Technology Laboratory, Department of Applied Chemistry, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, P. R. China
  • Received:1900-01-01 Revised:1900-01-01 Published:2008-01-04
  • Contact: QI Lu E-mail:qilu@pku.edu.cn

摘要: 采用碳负极材料和LiNi1/3Co1/3Mn1/3O2正极材料开发出18650型锂离子二次电池, 并采用充放电循环、混合脉冲功率特性测试(HPPC)、面积阻抗率(ASI)等方法研究了C/LiNi1/3Co1/3Mn1/3O2 体系的放电特性, 分析了材料颗粒和形貌、放电温度、电解液等因素对该体系放电性能(特别是大电流放电性能)的影响. 实验结果表明, LiNi1/3Co1/3Mn1/3O2 材料的一次粒子越小, 该体系充放电循环越稳定, 同时大电流放电性能越好; 提高放电温度可显著改善C/LiNi1/3Co1/3Mn1/3O2 的放电性能, 其放电末期的输出功率密度大幅度提高; 而高电导率的电解液也有利于该体系的长期大电流放电的性能.

关键词: 锂离子二次电池, 正极材料, LiNi1/3Co1/3Mn1/3, 放电性能

Abstract: 18650 type Li ion secondary cells were developed using carbon as anode material and LiNi1/3Co1/3·Mn1/3O2 as cathode material. The discharge performance of the C/LiNi1/3Co1/3Mn1/3O2 cell was studied through such methods as charge and discharge cycle, hybrid pulse power characterization (HPPC) and area-specific impedance (ASI) test. Study was also performed on the impact of such factors as material particle and morphology, discharge temperature and electrolyte on the discharge performances of the C/LiNi1/3Co1/3Mn1/3O2 cell, especially on its discharge performance under big currents. The results show that the C/LiNi1/3Co1/3Mn1/3O2 cell presents more stable charge/discharge cycles as well as better discharge performance under big currents with smaller original particle of LiNi1/3Co1/3·Mn1/3O2. It is also demonstrated that elevated discharge temperature prominently improves the discharge performance of the C/LiNi1/3Co1/3Mn1/3O2 cell, with its output power density at late discharge period growing by a large margin. Electrolyte with high conductivity also improves the cell’s long-termcycle performance under big discharge currents.

Key words: Lithiumion secondary battery, Cathode material, LiNi1/3Co1/3Mn1/3O2, Discharge performances

MSC2000: 

  • O646