The Degradation Mechanism of a Composite LiMnPO4 Cathode

被引：20

作者：

Norberg, Nick S. ^{[1
]}

Kostecki, Robert ^{[1
]}

机构：

[1] Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Environm Energy Technol Div, Berkeley, CA 94720 USA

来源：

JOURNAL OF THE ELECTROCHEMICAL SOCIETY | 2012年 / 159卷 / 09期

关键词：

POSITIVE-ELECTRODE MATERIALS; LI-ION; LITHIUM; PERFORMANCE; LIMN2O4; FE; SPECTROSCOPY; BEHAVIOR; LIFEPO4; RAMAN;

D O I：

10.1149/2.018209jes

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

The chemical and structural changes occurring in a LiMnPO4 composite cathode during electrochemical cycling were investigated by ex situ Raman microscopy. An O-2-plasma etching procedure was used to remove the thick surface carbon coating and expose LiMnPO4 particles for Raman characterization of LixMnPO4 at different states of charge (SOC). Pyrophosphate species, Li4P2O7, emerged at the exposed part of the LiMnPO4 composite cathode after a full charge and discharge cycle, indicating that the charged LixMnPO4 electrode is not chemically stable in standard LiPF6/carbonate-based electrolytes at room temperature. (C) 2012 The Electrochemical Society. [DOI: 10.1149/2.018209jes] All rights reserved.

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收藏

页码：A1431 / A1434

页数：4

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