Moisture driven aging mechanism of LiFePO4 subjected to air exposure

被引：56

作者：

Cuisinier, Marine ^{[1
]}

Martin, Jean-Frederic ^{[1
,2
]}

Dupre, Nicolas ^{[1
]}

Yamada, Atsuo ^{[2
]}

Kanno, Ryoji ^{[2
]}

Guyomard, Dominique ^{[1
]}

机构：

[1] Univ Nantes, CNRS, UMR 6502, Inst Mat Jean Rouxel,IMN, F-44322 Nantes 3, France

[2] Tokyo Inst Technol, Dept Elect Chem, Interdisciplinary Grad Sch Sci & Engn, Midori Ku, Yokohama, Kanagawa 2268502, Japan

来源：

ELECTROCHEMISTRY COMMUNICATIONS | 2010年 / 12卷 / 02期

关键词：

Li-ion; Cathode; LiFePO4; Aging; Moisture; STABILITY; CATHODES;

D O I：

10.1016/j.elecom.2009.12.003

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

The impact of air exposure on LiFePO4-C nanocomposites has been investigated at moderate temperature. We show here that the storage in 120 degrees C hot air for 30 days leads not only to the material delithiation but also to the formation of an amorphous ferric phosphate side-phase, accounting for 38% of the total iron. The formed phase is found to be partially hydrated, suggesting a water-driven aging mechanism and a proposed hypothetic formula: LixFePO4(OH)(x). The side-phase displays new electrochemical activity but poor cyclability and the overall battery performance is thus deteriorated. The regeneration of pristine structure, together with the performance recovery can be achieved by a simple thermal treatment under inert atmosphere. (C) 2009 Elsevier B.V. All rights reserved.

引用

页码：238 / 241

页数：4

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