CARBON MATERIAL FOR NEGATIVE ELECTRODE OF NONAQUEOUS ELECTROLYTE SECONDARY BATTERY, METHOD FOR PRODUCING SAME, NEGATIVE ELECTRODE OF NONAQUEOUS SECONDARY BATTERY USING SAME, AND NONAQUEOUS ELECTROLYTE SECONDARY BATTERY

摘要

The present invention provides a carbon material which is used for an electrode of a nonaqueous secondary battery that exhibits excellent characteristics by having both high-rate charge and discharge characteristics and high cycle characteristics. Another objective of the present invention is to reduce the production cost of a battery by shortening the battery fabrication step by making the electrolyte absorption rate higher. Specifically provided is a carbon material for a negative electrode of a nonaqueous electrolyte secondary battery, which is characterized by satisfying the following conditions (1) and (2). (1) The aspect ratio of the carbon material is not more than 10. (2) The desorbed CO amount of the carbon material as determined by a temperature programmed desorption mass spectrometer (TPD-MS) up to 1,000°C is 2-15 µmol/g (inclusive).