The thermal stability of lithiated graphite in the presence of solvents, electrolytes and LiPF6 salt was studied using C80 micro-calorimeter. The presence of cyclic carbonates or linear carbonates increases the activity of LixC6-solvent coexisting system, especially for the LixC6-linear carbonates one. LiPF6 was detected that it increases the activity greatly of its coexisting system with lithiated graphite. The coexisting system of LixC6 with the electrolyte of LiPF6/ethylene carbonate + diethyl carbonate shows less thermal stability, which is attributed to the activity between diethyl carbonate and LixC6. This also agrees with the experiment result of LixC6-diethyl carbonate coexisting system. (C) 2009 Elsevier B.V. All rights reserved.