Asymmetry between charge and discharge during high rate cycling in LiFePO4 -: In situ X-ray diffraction study

被引：65

作者：

Shin, Ho Chul ^{[1
,2
]}

Chung, Kyung Yoon ^{[1
]}

Min, Won Sik ^{[1
,2
]}

Byun, Dong Jin ^{[2
]}

Jang, Ho ^{[2
]}

Cho, Byung Won ^{[1
]}

机构：

[1] Korea Inst Sci & Technol, Battery Res Ctr, Seoul 136791, South Korea

[2] Korea Univ, Dept Mat Sci & Engn, Seoul 136713, South Korea

来源：

ELECTROCHEMISTRY COMMUNICATIONS | 2008年 / 10卷 / 04期

关键词：

LiFePO4; asymmetry; in situ X-ray diffraction; lithium secondary batteries;

D O I：

10.1016/j.elecom.2008.02.002

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

Asymmetric behavior of structural changes during charge and discharge of C-coated LiFePO4 has been investigated using synchrotron based in situ XRD. C-coated LiFePO4 undergoes phase transformation from triphylite to heterosite during charge and vise versa during discharge. However, it is observed that the phase transformation of C-coated Li1-xFePO4 during discharge is more difficult to be complete than that during charge. At 2C rate, the phase transformation from heterosite to triphylite was hardly observed during discharge while the complete phase transformation was observed in the previous charge. This indicates that the degree of the phase transformation completeness depends on the direction of the phase transformations. (c) 2008 Elsevier B.V. All rights reserved.

引用

页码：536 / 540

页数：5

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