Phase Stability Study of Li1-xMnPO4 (0≤x≤1) Cathode for Li Rechargeable Battery

被引：112

作者：

Kim, Sung-Wook ^{[1
]}

Kim, Jongsoon

Gwon, Hyeokjo

Kang, Kisuk

机构：

[1] Korea Adv Inst Sci & Technol, Dept Mat Sci & Engn, Taejon 305701, South Korea

来源：

JOURNAL OF THE ELECTROCHEMICAL SOCIETY | 2009年 / 156卷 / 08期

关键词：

cathodes; electron microscopy; lithium compounds; manganese compounds; secondary cells; solid-state phase transformations; X-ray diffraction; ELECTRODE MATERIALS; LITHIUM BATTERIES; MN; FE; OLIVINES; DIAGRAM; LIMPO4;

D O I：

10.1149/1.3138705

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

The phase stability of Li1-xMnPO4 (0 <= x <= 1) is investigated in this study for different Li compositions and temperatures by high temperature X-ray diffraction and electron microscopy. The map of stable phases is determined at temperature ranges between room temperature and 410 degrees C. While pure LiMnPO4 phase is stable at high temperature, partial phase transformation of MnPO4 into Mn2P2O7 is observed in delithiated phases above 210 degrees C. Electron microscopy study also indicates the instability of the delithiated phase. The morphology of LiMnPO4 is severely damaged upon delithiation. The instability of the delithiated phase and the phase transformation into Mn2P2O7 may imply that safety concerns can be raised regarding the LiMnPO4 cathode, unlike its Fe counterpart.

引用

页码：A635 / A638

页数：4

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