Superior high-rate cycling performance of LiFePO4/C-PPy composite at 55 °C

被引：105

作者：

Yang, Yang ^{[1
]}

Liao, Xiao-Zhen ^{[1
]}

Ma, Zi-Feng ^{[1
]}

Wang, Bao-Feng ^{[2
]}

He, Li ^{[1
]}

He, Yu-Shi ^{[1
]}

机构：

[1] Shanghai Jiao Tong Univ, Dept Chem Engn, Shanghai 200240, Peoples R China

[2] Shanghai Univ Elect Power, Shanghai 200090, Peoples R China

来源：

ELECTROCHEMISTRY COMMUNICATIONS | 2009年 / 11卷 / 06期

基金：

上海市自然科学基金;

关键词：

Polypyrrole coating; LiFePO4/C cathode; Lithium ion batteries; CATHODE MATERIALS; PHOSPHO-OLIVINES; LITHIUM; ELECTROLYTE; REDUCTION; BATTERIES;

D O I：

10.1016/j.elecom.2009.04.021

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

070208 [无线电物理];

摘要：

A facile chemical polymerization method was applied to prepare LiFePO4/C-PPy composite using Fe(III)tosylate as oxidant. The as-prepared LiFePO4/C-PPy sample with My content of approximately 4 wt% showed great rate capability with a discharge capacity of 115 mAh/g at 20C. High temperate cycling performance of the LiFePO4/C-PPy sample was compared with bare LiFePO4/C at 5C charge-discharge rate at 55 degrees C. The LiFePO4/C-PPy cathode showed superior cycling stability with an initial capacity of 155 mAh/g. Ninety percentage of this initial capacity was retained after 300 cycles, compared to 40% of that of bare LiFePO4/C. The LiFePO4/C-PPy electrode showed stable discharge plateau voltage of 3.35-3.25 V vs. Li+/Li during long term cycling. The superior performance of the LiFePO4/C-PPy electrode was due to the enhanced electrical conductivity, negligible iron dissolution and alleviated electrode cracking contributed by PPy coating. (C) 2009 Elsevier B.V. All rights reserved.

引用

页码：1277 / 1280

页数：4

共 15 条

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