Patent ID: 7816037
Filing Date: 2010-10-19
Classification: H01M,Y02E,Y10T

Abstract:
1. An anode material for lithium ion secondary battery comprising a coated graphite powder, which is a graphite powder in which interior portions of fine pores are coated with a carbonized material of thermoplastic resin, wherein the coated graphite powder has: (1) a mesopore volume defined by IUPAC is 0.01 cc/g or less as calculated with the BJH method as viewed from desorption isotherm; (2) an average particle size as measured by a laser-scattering-particle-size-distribution measuring device ranges from 10 μm to 50 μm, and a ratio of standard deviation to the average particle size, σ/D, is 0.02 or less; (3) a peak strength ratio R of 1,360 cm (4) a rate of oxidation loss when oxidized in atmospheres of 400° C. and an air mass flow of 3 L/min. for one hour is 2 wt % or more; (5) a specific surface area is in the range of 1.6 m (6) an average interlayer spacing d