Negative Electrode Material for Nonacqueous Electrolyte Secondary Battery of High Input/Output Current, Method for Producing the Same and Battery Employing Negative Electrode Material

摘要

A negative electrode material for a high input/output currant-type non-aqueous electrolyte secondary battery, comprising a carbon material having an average (002) interlayer spacing d₀₀₂ of 0.355-0.400 nm determined by X-ray diffractometry and a true density of 1.50-1.60 g/cm³, 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 is non-graphitizable and has properties suitable for a negative electrode material for high input/output current non-aqueous electrolyte secondary batteries as used in HEV, etc.