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
收藏
页码：1215 / 1219
页数：5
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