Negative electrode material for nonacqueous electrolyte secondary battery of high input/output current, method for producing the same and battery employing negative electrode material

• Main Authors: MAEDA MARIKO, NAGAI AISAKU, SHIMIZU KAZUHIKO, MORINISHI SYUJI, HOSHI AKIKO
• Format: Patent
• Language: English
• Published: 18.05.2010
• Subjects: BASIC ELECTRIC ELEMENTS; CHEMISTRY; COMPOUNDS THEREOF; ELECTRIC EQUIPMENT OR PROPULSION OF ELECTRICALLY-PROPELLEDVEHICLES; ELECTRICITY; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES, IN GENERAL; INORGANIC CHEMISTRY; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; METALLURGY; NON-METALLIC ELEMENTS; PERFORMING OPERATIONS; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY; TRANSPORTING; VEHICLES IN GENERAL

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.