Non-aqueous liquid electrolyte secondary battery

Details Non-aqueous liquid electrolyte secondary battery Non-aqueous liquid electrolyte secondary battery

H - Electricity

01

M

H01M 4/40 (2006.01) H01M 4/58 (2006.01)

Patent

CA 2125003

A non-aqueous liquid electrolyte secondary battery including an anode formed of a carbon material capable of dope and undope of lithium, a cathode formed of a lithium-containing transition metal composite oxide and a non-aqueous liquid electrolyte is disclosed. The carbon material for the anode contains graphite and a non-graphitic carbon material formed of at least a non-graphitizable carbon material or a graphitizable carbon material. The non-graphitic carbon material preferably exhibits a discharge capacity per gram 80% or more of that of the graphite, measured in the first cycle of intermittent charging and discharging. The non-graphitic carbon material exhibits a ratio of a discharge capacity up to 0.3 V to a discharge capacity up to 1.5 V which is not smaller than 0.5, measured in the first cycle of intermittent charging and discharging with a standard of a lithium potential. Specifically, the graphite has a true density of 2.1 g/cm3 or greater, an interplanar distance of (002) of less than 0.340 nm found by X-ray diffraction, and a C-axis crystallite size of the (002) plane of 14.0 nm or greater. The non-graphitic carbon material has a true density of 1.70 g/cm3 or smaller, an interplanar distance of (002) plane of 0.37 nm or greater, and an exothermic peak observed at temperatures except 700°C and higher temperatures in differential thermal analysis in an air stream. The non-aqueous liquid electrolyte is a liquid electrolyte formed by dissolving an electrolyte into a non-aqueous solvent containing ethylene carbonate.

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