In-situ synchrotron X-ray absorption studies of LiMn0.25Fe0.75PO4 as a cathode material for lithium ion batteries

被引：36

作者：

Chen, Yi-Chun ^{[1
]}

Chen, Jin-Ming ^{[2
]}

Hsu, Chia-Haw ^{[2
]}

Lee, Jyh-Fu ^{[3
]}

Yeh, Jien-Wei ^{[1
]}

Shih, Han C. ^{[1
,4
]}

机构：

[1] Natl Tsing Hua Univ, Dept Mat Sci & Engn, Hsinchu 300, Taiwan

[2] Ind Technol Res Inst, Chutung 310, Taiwan

[3] Natl Synchron Radiat Res Ctr, Hsinchu 300, Taiwan

[4] Chinese Culture Univ, Inst Mat Sci & Nanotechnol, Taipei 111, Taiwan

来源：

SOLID STATE IONICS | 2009年 / 180卷 / 20-22期

关键词：

X-ray absorption; Olivine structure; Lithiation mechanism; Jahn-Teller effect; Lithium ion batteries; LIFEPO4; FE; LI-X(MNYFE1-Y)PO4; MECHANISM; OLIVINES; LIMNPO4;

D O I：

10.1016/j.ssi.2009.06.013

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Recently, lithium bi-metal phosphates (LiM'M '' PO4) have been synthesized for use as cathode materials in order to increase cell voltages and electrical performances. In this work, we have substituted Mn2+ at the 4c site of LiFePO4 to prepare the lithium bi-metal phosphate LiMn0.25Fe0.75PO4 and have found that it greatly enhances the cell voltage. At a 0.05 C discharge rate, the cell capacity was about 153 mAhg(-1) and the average working voltage rose to 3.53 V due to the Mn substitution. However, the capacity and working voltage both decrease as the discharge rate increases. By in-situ metal K-edge absorption analysis, it reveals that the substituted metal Mn2+ does not work completely at a higher discharge rate, due to poor electrical conductivity and a serious Jahn-Teller effect. Crown Copyright (C) 2009 Published by Elsevier B.V. All rights reserved.

引用

页码：1215 / 1219

页数：5

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