| 摘要 |
A negative electrode material for non-aqueous electrolyte secondary batteries, which is best suited for large current I/O non-aqueous electrolyte secondary batteries represented by those for hybrid electric vehicles (HEVs), which are unlikely to be influenced by the deterioration of battery characteristics due to water, and a production process thereof are provided. The negative electrode material having at least one exothermic peak in the range of not lower than 650° C. and lower than 700° C., and at least one exothermic peak in the range of not lower than 700° C. and lower than 760° C., in differential thermal analysis measured under an air flow. The production process of the negative electrode material for non-aqueous electrolyte secondary batteries is characterized by carbonizing a negative electrode material precursor having an oxygen content of not less than 5% by weight and less than 10% by weight, under an inert gas flow at a rate of not more than 120 ml/g.h, under a pressure of normal pressure to 10 kPa, at a temperature higher than 1100° C. and lower than 1500° C.
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