To elucidate the gas generation mechanism due to electrolyte decomposition in commercial lithium-ion cells after long cycling, we developed a device which can accurately determine the volume of generated gas in the cell. Experiments on Li C rLi CoO cells x 61yx 2 using electrolytes such as 1 M LiPF in propylene carbonate PC , dimethyl carbonate DMC., ethyl methyl carbonate EMC., and diethyl Ž. Ž Ž 6 carbonate DEC are presented and discussed. In the nominal voltage range 4.2–2.5 V , compositional change due mainly to ester Ž. Ž . exchange reaction occurs, and gaseous products in the cell are little. Generated gas volume and compositional change in the electrolyte are detected largely in overcharged cells, and we discussed that gas generation due to electrolyte decomposition involves different decomposition reactions in overcharged and overdischarged cells.
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