Wang QS, Sun JH, Chen XF, Chu GQ, Chen CH (2009d) Effects of solvents and salt on the thermal stability of charged LiCoO(2). Materials Research Bulletin 44(3), 543-548. [In English]

Web link: http://dx.doi.org/10.1016/j.materresbull.2008.07.006

Keywords:

Inorganic compounds, Intercalation reactions, Electrochemical, measurements, Catalytic properties, lithium-ion batteries, phenyl diphenyl phosphate, elevated-temperatures, exothermic reactions, electrolyte salt, cells, graphite, safety, li0.5coo2, carbonate

Abstract: Lithium-ion batteries safety is an issue that should be solved. The thermal stability of Li(0.5)CoO(2) in the presence of solvents/electrolyte and LiPF(6) salt were studied by using C80 micro-calorimeter in this paper. It was found that the thermal stability of Li(0.5)CoO(2) either in the presence of cyclic carbonate or linear carbonate is decreased greatly, especially for the linear carbonate-Li(0.5)CoO(2). coexisting system, and the thermal stability of dimethyl carbonate-Li(0.5)CoO(2) coexisting system is the least stable one. LiPF(6), can prevent oxygen releasing from Li(0.5)CoO(2) at low temperature, but the delayed reaction will generate more heat at higher temperature. At last, thermal stability of two kinds of electrolytes with Li(0.5)CoO(2) was explored. The LiPF(6)/ethylene carbonate + dimethyl carbonate + ethylmethyl carbonate-Li(0.5)CoO(2) system shows less thermal stability, which is attributed to the activity between dimethyl carbonate and Li(0.5)CoO(2), as well as agree with the thermal experiment on dimethyl carbonate-Li(0.5)CoO(2) coexisting system. (C) 2008 Elsevier Ltd. All rights reserved.