Investigation on capacity fading of LiFePO4 in aqueous electrolyte

被引：145

作者：

He, Ping ^{[1
]}

Liu, Jin-Long ^{[1
]}

Cui, Wang-Jun ^{[1
]}

Luo, Jia-Yan ^{[1
]}

Xia, Yong-Yao ^{[1
]}

机构：

[1] Fudan Univ, Dept Chem, Shanghai Key Lab Mol Catalysis & Innovat Mat, Inst New Energy, Shanghai 200433, Peoples R China

来源：

ELECTROCHIMICA ACTA | 2011年 / 56卷 / 05期

基金：

中国国家自然科学基金;

关键词：

LiFePO4; Capacity fading; Aqueous electrolyte; Li-ion batteries; LITHIUM INTERCALATION; OXYGEN REDUCTION;

D O I：

10.1016/j.electacta.2010.11.027

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：

The capacity loss rate of LiFePO4 in aqueous electrolyte was found to be much faster than it in organic electrolyte. The cycling stability in aqueous electrolyte with various dissolved oxygen content and pH value was extensively studied by cyclic voltammetry. It was found that both high OH- and dissolve O-2 content can accelerate the cycling fading of LiFePO4. It has been proved that the capacity fading of LiFePO4 is due to not only chemical instability but also electrochemical instability. Mossbauer spectroscopy demonstrated that the Fe(III)-containing species was formed in the active materials arisen from the irreversible side reaction. The carbon-coated LiFePO4 prepared by chemical vapor decomposition method shows significantly improvement in cycling stability. The carbon coating technology provides an effective approach to enhance cycling performance in aqueous electrolyte as well as proof of proposed fading mechanism. (C) 2010 Elsevier Ltd. All rights reserved.

引用

页码：2351 / 2357

页数：7

共 15 条

[1]

Building better batteries [J].