Performance improvement of graphite/LiNi0.4Co0.2Mn0.4O2 battery at high voltage with added Tris (trimethylsilyl) phosphate

被引：48
作者：
Rong, Haibo
Xu, Mengqing [1 ]
Xie, Boyuan
Huang, Weizhao
Liao, Xiaolin
Xing, Lidan
Li, Weishan
机构：
[1] S China Normal Univ, Engn Res Ctr Mat & Technol Electrochem Energy Sto, Sch Chem & Environm, Minist Educ, Guangzhou 510006, Guangdong, Peoples R China
来源：
JOURNAL OF POWER SOURCES | 2015年 / 274卷
基金：
中国国家自然科学基金;
关键词：
Lithium ion battery; High voltage; Electrolyte; Interface; Additive; LINI1/3CO1/3MN1/3O2 CATHODE MATERIALS; LAYERED LINI0.4MN0.4CO0.2O2; ION; ELECTROLYTES; TRIS(TRIMETHYLSILYL)PHOSPHATE; LI(NI1/3CO1/3MN1/3)O-2; LINI0.5CO0.2MN0.3O2; ADDITIVES; BEHAVIOR; SULFONE;
D O I：
10.1016/j.jpowsour.2014.10.123
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：
The performance of graphite/LiNi0.4Co0.2Mn0.4O2 pouch cells cycled to 435 V with 1.0 M LiPF6 in EC/DMC/EMC (1/1/1, v/v/v) solution with and without TMSP at room temperature has been investigated. Incorporation of 1% TMSP to the control electrolyte results in a significant improvement in cycling stability and rate performance of graphite/LiNi0.4Co0.2Mn0.4O2 cells. Electrochemical impedance spectra (EIS) results indicate that the use of TMSP can dramatically decrease the impedance of the graphite/LiNi0.4Co0.2Mn0.4O2 pouch cells. After 70 cycles, ex-situ analyses of the graphite/LiNi0.4Co0.2Mn0.4O2 cells were conducted via the combinations of XPS, SEM, TEM, and ICP-MS. The enhanced performance is ascribed to the modified cathode film with TMSP incorporated, which inhibits the continuous decomposition of the electrolyte on the cathode surface and provides the protection for the cathode bulk material upon cycling. (C) 2014 Elsevier B.V. All rights reserved.
引用
收藏
页码：1155 / 1161
页数：7
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