Effect of tris(trimethylsilyl)borate on the high voltage capacity retention of LiNi0.5Co0.2Mn0.3O2/graphite cells

被引：144

作者：

Zuo, Xiaoxi ^{[1
]}

Fan, Chengjie ^{[1
]}

Liu, Jiansheng ^{[2
]}

Xiao, Xin ^{[1
]}

Wu, Junhua ^{[1
]}

Nan, Junmin ^{[1
]}

机构：

[1] S China Normal Univ, Sch Chem & Environm, MOE Key Lab Theoret Chem Environm, Guangzhou 510006, Guangdong, Peoples R China

[2] Guangzhou Tinci Mat Technol Co Ltd, Guangzhou 510760, Guangdong, Peoples R China

来源：

JOURNAL OF POWER SOURCES | 2013年 / 229卷

关键词：

Tris(trimethylsilyl)borate; Additive; Lithium ion cells; High voltage; Cycling performance; LICOO2 CATHODE MATERIALS; TRIS(PENTAFLUOROPHENYL) BORANE; THERMAL-STABILITY; ELECTROLYTE; PERFORMANCE; IMPROVE; SURFACE; TEMPERATURE; INTERFACE; DENSITY;

D O I：

10.1016/j.jpowsour.2012.12.056

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：

This study demonstrates that tris(trimethylsilyl)borate (TMSB) additive in the electrolyte can dramatically improve the cycling performance of LiNi0.5Co0.2Mn0.3O2/graphite cell at higher voltage operation. And the effects of this additive are characterized by linear sweep voltammetry (LSV), electrochemical impedance spectroscopy (EIS), X-ray photoelectron spectroscopy (XPS), and transmission electron microscopy (TEM). In the voltage range of 3.0-4.4 V, LiNi0.5Co0.2Mn0.3O2/graphite cell with TMSB in the electrolyte retains about 92.3% of its initial capacity compared to the cell without additive in the electrolyte that retains only 28.5% of its initial capacity after 150 cycles, showing the promising prospect of TMSB at higher voltage. The enhanced cycling performance is attributed to the thinner film originated from TMSB on the LiNi0.5Co0.2Mn0.3O2 and the combination of TMSB with PF6- and F- in the electrolyte, which not only protects the undesirable decomposition of EC solvents but also results in lower interfacial impedance. (C) 2012 Elsevier B.V. All rights reserved.

引用

页码：308 / 312

页数：5

共 28 条

[1] Functional electrolytes: Novel type additives for cathode materials, providing high cycleability performance [J].