Lithium Difluoro(oxalato)borate as Additive to Improve the Thermal Stability of Lithiated Graphite

被引：66

作者：

Chen, Zonghai ^{[1
]}

Qin, Yan ^{[1
]}

Liu, Jun ^{[1
]}

Amine, K. ^{[1
]}

机构：

[1] Argonne Natl Lab, Div Chem Engn, Argonne, IL 60439 USA

来源：

ELECTROCHEMICAL AND SOLID STATE LETTERS | 2009年 / 12卷 / 04期

关键词：

decomposition; differential scanning calorimetry; graphite; lithium compounds; organic compounds; organometallic compounds; solid electrolytes; thermal stability; LIBOB-BASED ELECTROLYTES; INTERFACE; SALT; SIZE;

D O I：

10.1149/1.3070581

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

The reaction of lithiated graphite with a nonaqueous electrolyte of 1.2 M LiPF6 in ethylene carbonate/ethyl methyl carbonate (3:7 by weight) was investigated using differential scanning calorimetry. The decomposition of the solid electrolyte interphase (SEI) took place at about 100 degrees C and was followed by a continuous formation/decomposition of the SEI up to 250 degrees C. Another two peaks were observed at temperatures above 250 degrees C. These peaks were attributed to the major reaction of lithiated graphite with the nonaqueous electrolyte. With the addition of lithium difluoro(oxalato)borate as an electrolyte additive, the onset temperatures of the three peaks were pushed higher, as confirmed by the activation energies obtained.

引用

页码：A69 / A72

页数：4