Thermodynamics and kinetics of self-discharge in graphite-lithium electrodes

被引：8

作者：

Reynier, Y ^{[1
]}

Yazami, R ^{[1
]}

Fultz, B ^{[1
]}

机构：

[1] CALTECH, Div Engn & Appl Sci, Pasadena, CA 91125 USA

来源：

SEVENTEENTH ANNUAL BATTERY CONFERENCE ON APPLICATIONS AND ADVANCES, PROCEEDINGS | 2002年

关键词：

D O I：

10.1109/BCAA.2002.986387

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

Li/EC-DMC-LiPF6/LixC6 half-cells were discharged to 0V vs. Li (+)/Li then stored at temperatures ranging between 50 and 85 degreesC for times between 1 and 12 days. The remaining capacity was measured by galvanostatis delithiation. The time evolution of the open-cicuit voltage (OCV) was also monitored during storage. The activation energy of the self-discharge reaction was determined independently from the temperature dependence of the reaction rate constant and from analysis of the OCV curves. It was found to ba approximately 50 kJ.mol(-1). Most of the capacity losses were recoverable after further charge/discharge cycling. The remarkable thermal stability of LixC6 electrode is related to the protective role of the Solide Electrolyte Interphase (SEI). The SEI evolves to more stable composition during aging due to an increase of its insoluble inorganic part.

引用

页码：145 / 150

页数：6