Patent ID: 7718307
Filing Date: 2010-05-18
Classification: C01B,H01M,Y02E

Abstract:
1. A negative electrode material for a high input/output current-type non-aqueous electrolyte secondary battery, comprising a carbon material having an average (002) interlayer spacing d 002 of 0.355-0.400 nm determined by X-ray diffractometry and a true density of 1.50-1.60 g/cm 3 , and exhibiting a capacity (A) of at least 50 mAh/g in a battery voltage range of 0.3-1.0 V and a ratio ((A)/(B)) of at least 0.3 between the capacity (A) and a capacity (B) in a battery voltage range of 0-1.0 V when measured as discharge capacities with a counter electrode of lithium; the negative electrode material further showing a lowering of at most 2% in efficiency defined as discharge capacity/charge capacity after 1 month of standing in atmospheric air.