Development of novel lithium borate additives for designed surface modification of high voltage LiNi0.5Mn1.5O4 cathodes

被引：167

作者：

Xu, Mengqing ^{[1
]}

Zhou, Liu ^{[1
]}

Dong, Yingnan ^{[1
]}

Chen, Yanjing ^{[1
]}

Demeaux, Julien ^{[1
]}

MacIntosh, Alex D. ^{[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：

ENERGY & ENVIRONMENTAL SCIENCE | 2016年 / 9卷 / 04期

关键词：

ELECTROLYTE INTERFACE FORMATION; ELECTROCHEMICAL PERFORMANCE; ION BATTERIES; LI-ION; SPINEL CATHODE; LIPF6-BASED ELECTROLYTES; COATED LINI0.5MN1.5O4; BIS(OXALATO) BORATE; VINYLENE CARBONATE; LONG-LIFE;

D O I：

10.1039/c5ee03360h

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

A novel series of lithium alkyl trimethyl borates and lithium aryl trimethyl borates have been prepared and investigated as cathode film forming additives. The borates are prepared via the reaction of lithium alkoxides or lithium phenoxides with trimethyl borate. Incorporation of 0.5-2.0% (wt) of the lithium borates to a baseline electrolyte (1.0 M LiPF6 in 3 : 7 (EC/EMC)) results in improved capacity retention and efficiency of high voltage graphite/LiNi0.5Mn1.5O4 cells especially upon cycling at elevated temperature (55 degrees C). The improved performance results from the sacrificial oxidation of the lithium borate on the cathode surface to generate a cathode passivation film. The lithium borates can be readily structurally modified to act as a functional group delivery agent to modify the cathode surface. Ex situ surface analysis of the electrodes after cycling confirms that the lithium borates modify the cathode surface and generate a borate rich surface film which inhibits electrolyte oxidation and Mn dissolution.

引用

页码：1308 / 1319

页数：12

共 51 条

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