Low-temperature performance of LiFePO4/C cathode in a quaternary carbonate-based electrolyte

被引：224
作者：
Liao, Xiao-Zhen [1 ]
Ma, Zi-Feng [1 ]
Gong, Qiang [1 ]
He, Yu-Shi [1 ]
Pei, Li [1 ]
Zeng, Ling-Jie [1 ]
机构：
[1] Shanghai Jiao Tong Univ, Dept Chem Engn, Shanghai 200240, Peoples R China
来源：
ELECTROCHEMISTRY COMMUNICATIONS | 2008年 / 10卷 / 05期
基金：
中国国家自然科学基金; 上海市自然科学基金;
关键词：
low-temperature performance; LiFePO4/C cathode; quaternary carbonate-based electrolyte; lithium ion batteries;
D O I：
10.1016/j.elecom.2008.02.017
中图分类号：
O646 [电化学、电解、磁化学];
学科分类号：
081704 ;
摘要：
The low-temperature performance of LiFePO4/C cathode in a quaternary carbonate-based electrolyte (1.0 M LiPF6/EC+DMC+DEC+EMC (1: 1: 1:3, v/v)) was studied. The discharge capacities of the LiFePO4/C cathode were about 134.5 mAh/g (20 degrees C), 114 mAh/g (0 degrees C), 90 mAh/g (-20 degrees C) and 69 mAh/g (-40 degrees C) using a 1C charge-discharge rate. Cyclic voltammetry measurements show obviously sluggish of the lithium insertion-extraction process of the LiFePO4/C cathode as the operation temperature falls below -20 degrees C. Electrochemical impedance analyses demonstrate that the sluggish of charge-transfer reaction on the electrolyte/LiFePO4/C interface and the decrease of lithium diffusion capability in the bulk LiFePO4 was the main performance limiting factors at low-temperature. (C) 2008 Elsevier B.V. All rights reserved.
引用
收藏
页码：691 / 694
页数：4
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