Suppression of Jahn-Teller distortion of spinel LiMn2O4 cathode

被引：145

作者：

Li, Xifei ^{[1
,2
]}

Xu, Youlong ^{[1
]}

Wang, Chunlei ^{[2
]}

机构：

[1] Xi An Jiao Tong Univ, Elect Mat Res Lab, Key Lab, Minist Educ, Xian 710049, Peoples R China

[2] Florida Int Univ, Dept Mech & Mat Engn, Miami, FL 33174 USA

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2009年 / 479卷 / 1-2期

关键词：

LiMn2O4; Shell; Core; Suppression; Jahn-Teller distortion; RECHARGEABLE LITHIUM BATTERIES; MANGANATE THIN-FILMS; LI-ION BATTERIES; 4 V LIMN2O4; ELECTROCHEMICAL PROPERTIES; OXIDES; TEMPERATURE; IMPROVEMENT; ELECTRODES; TRANSPORT;

D O I：

10.1016/j.jallcom.2008.12.081

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：

Jahn-Teller distortion is one of the most important reasons of capacity fade for spinet LiMn2O4 as cathode material for lithium ion batteries. In this work, we proposed an approach to prepare the modified spinel LiMn2O4 to suppress this distortion. Transmission electron microscopy (TEM) indicated that the LiNixMn2-xO4 shell/LiMn2O4 core particle was successfully formed. The modified LiMn2O4 results in the lattice shrinkage and increases Mn-O bond strength, improving the spinet structural stability. During charge and discharge cycle, the modified LiMn2O4 is beneficial to the suppression of Jahn-Teller distortion at the surface of LiMn2O4 particles, which is confirmed by differential scanning calorimetry (DSC) and X-ray diffraction (XRD) analysis. This suppression of Jahn-Teller distortion is attributed to the shell of LiNixMn2-xO4 solid solution formed on the surface of LiMn2O4 particles. (C) 2008 Elsevier B.V. All rights reserved.

引用

页码：310 / 313

页数：4

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