Tris(trimethylsilyl) phosphite as electrolyte additive for high voltage layered lithium nickel cobalt manganese oxide cathode of lithium ion battery

被引：134

作者：

Mai, Shaowei ^{[1
]}

Xu, Mengqing ^{[1
]}

Liao, Xiaolin ^{[1
]}

Hu, Jiana ^{[1
]}

Lin, Haibin ^{[1
]}

Xing, Lidan ^{[1
]}

Liao, Youhao ^{[1
]}

Li, Xiaoping ^{[1
]}

Li, Weishan ^{[1
]}

机构：

[1] S China Normal Univ, Key Lab Electrochem Technol Energy Storage & Powe, Engn Res Ctr Mat & Technol Electrochem Energy Sto, Sch Chem & Environm,Minist Educ,Guangdong Higher, Guangzhou 510006, Guangdong, Peoples R China

来源：

ELECTROCHIMICA ACTA | 2014年 / 147卷

基金：

中国国家自然科学基金;

关键词：

Lithium ion battery; Layered lithium nickel cobalt manganese oxide; Tris(trimethylsilyl)phosphite; Electrolyte additive; Cyclic stability; Rate Capability; CARBONATE-BASED ELECTROLYTE; LINI0.5MN1.5O4; CATHODE; ELEVATED-TEMPERATURE; PROPYLENE CARBONATE; SELF-DISCHARGE; PERFORMANCE; SULTONE; CELLS;

D O I：

10.1016/j.electacta.2014.09.157

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

Tris(trimethylsilyl) phosphite (TMSPi) is reported as an effective electrolyte additive for high voltage layered lithium nickel cobalt manganese oxide cathode of lithium ion battery. Charge/discharge tests demonstrate that the cyclic stability and rate capability of LiNi1/3Co1/3Mn1/3O2 can be improved significantly by adding 0.5wt% TMSPi into a standard electrolyte, 1.0 M LiPF6 in ethylene carbonate/dimethyl carbonate (1/2, in volume). The capacity retention of LiNi1/3Co1/3Mn1/3O2 is improved from 75.2% to 91.2% after 100 cycles at 0.5 C rate (1C = 160 mA g(-1)), while its discharge capacity at 5 C is enhanced from 122.4 mAh g(-1) to 134.4 mAh g(-1). This improvement can be ascribed to the suppression of electrolyte decomposition and transition metal ion dissolution by TMSPi, due to the preferential oxidation of TMSPi to electrolyte and the formation of a protective solid electrolyte interphase on LiNi1/3Co1/3Mn1/3O2, which are confirmed by electrochemical measurements and surface characterizations. (C) 2014 Elsevier Ltd. All rights reserved.

引用

页码：565 / 571

页数：7

共 30 条

[1] XPS identification of the organic and inorganic components of the electrode/electrolyte interface formed on a metallic cathode [J].