Journal of Hazardous Materials 2009-08-15

Effects of solvents and salt on the thermal stability of lithiated graphite used in lithium ion battery.

Qingsong Wang, Jinhua Sun, Chunhua Chen

Index: J. Hazard. Mater. 167(1-3) , 1209-14, (2009)

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Abstract

The thermal stability of lithiated graphite in the presence of solvents, electrolytes and LiPF(6) salt was studied using C80 micro-calorimeter. The presence of cyclic carbonates or linear carbonates increases the activity of Li(x)C(6)-solvent coexisting system, especially for the Li(x)C(6)-linear carbonates one. LiPF(6) was detected that it increases the activity greatly of its coexisting system with lithiated graphite. The coexisting system of Li(x)C(6) with the electrolyte of LiPF(6)/ethylene carbonate+diethyl carbonate shows less thermal stability, which is attributed to the activity between diethyl carbonate and Li(x)C(6). This also agrees with the experiment result of Li(x)C(6)-diethyl carbonate coexisting system.