In-situ synchrotron X-ray absorption studies of LiMn(0.25)Fe(0.75)PO(4) as a cathode material for lithium ion batteries

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题名:	In-situ synchrotron X-ray absorption studies of LiMn(0.25)Fe(0.75)PO(4) as a cathode material for lithium ion batteries
作者:	Shih, HC (Shih, Han C.) Chen, YC (Chen, Yi-Chun) Chen, JM (Chen, Jin-Ming) Hsu, CH (Hsu, Chia-Haw) Lee, JF (Lee, Jyh-Fu) Yeh, JW (Yeh, Jien-Wei)
贡献者:	奈米材料研究所
关键词:	X-ray absorption Olivine structure Lithiation mechanism Jahn-Teller effect Lithium ion batteries
日期:	2009
上传时间:	2011-11-30 12:55:59 (UTC+8)
摘要:	Recently, lithium bi-metal phosphates (LiM'M '' PO(4)) have been synthesized for use as cathode materials in order to increase cell voltages and electrical performances. In this work, we have substituted Mn(2+) at the 4c site of LiFePO(4) to prepare the lithium bi-metal phosphate LiMn(0.25)Fe(0.75)PO(4) 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 Mn(2+) 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.
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