Modified graphite particles and battery using the same

摘要

Modified graphite particles are described, which have an almost circular and tabular shape, an average particle size Ap of 12 to 18 mum, a BET specific surface area Ss of 4 to 6 m2/g, and a BET specific surface area to average particle size ratio, Ss/Ap, of 0.35 or less, and which are obtained by treating tabular particles of lumpy or flaky graphite to break or slightly fold the periphery of the tabular particles to increase the degree of circularity. A battery having the modified graphite particles as an anode active material is also described.