Improved Performance of LiNi0.5Mn1.5O4 Cathodes with Electrolytes Containing Dimethylmethylphosphonate (DMMP)

被引：69

作者：

Xu, Mengqing ^{[1
]}

Lu, Dongsheng ^{[1
]}

Garsuch, Arnd ^{[2
]}

Lucht, Brett L. ^{[1
]}

机构：

[1] Univ Rhode Isl, Dept Chem, Kingston, RI 02881 USA

[2] GCN E, BASF SE, D-67056 Ludwigshafen, Germany

来源：

JOURNAL OF THE ELECTROCHEMICAL SOCIETY | 2012年 / 159卷 / 12期

基金：

中国国家自然科学基金;

关键词：

LITHIUM-ION BATTERIES; LIPF6-BASED ELECTROLYTES; OXIDATIVE DECOMPOSITION; SURFACE; INHIBITION; FE; NI;

D O I：

10.1149/2.077212jes

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

The cycling performance of Li/LiNi0.5Mn1.5O4 cells with 1.0 M LiPF6 in ethylene carbonate (EC)/ethyl methyl carbonate (EMC) (3:7) with and without added dimethyl methylphosphonate (DMMP) (0.5-1.0%) was investigated. Addition of DMMP resulted in improved capacity retention during cycling to high voltage. (4.9 V vs Li). Ex-situ surface analysis of LiNi0.5Mn1.5O4 electrodes after cycling via Scanning Electron Microscopy (SEM), X-ray Photoelectron Spectroscopy (XPS) and Infrared (IR) spectroscopy suggest that addition of DMMP inhibits electrolyte decomposition on the surface of the cathode. Addition of DMMP also inhibits the dissolution of Mn from LiNi0.5Mn1.5O4 particles stored in electrolyte at 85 degrees C. (C) 2012 The Electrochemical Society. [DOI: 10.1149/2.077212jes] All rights reserved.

引用

收藏

页码：A2130 / A2134

页数：5

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