Carbonaceous material for nonaqueous electrolyte secondary battery negative electrode

A method of producing a carbonaceous material for a nonaqueous electrolyte secondary battery negative electrode, the method comprising:

• (1) a step of pulverizing a non-graphitizable carbon precursor to obtain a non-graphitizable carbon precursor containing more than 25.6 wt. % and not more than 80 wt.% of a volatile component;
• (2) a heat treatment step of holding the pulverized non-graphitizable carbon precursor for at least one minute at a temperature of from 250 to 800° C.;
• and
• (3) a calcination step of calcining the product at an attainment temperature of from 800 to 1,600° C.,
• wherein the carbonaceous material for a nonaqueous electrolyte secondary battery negative electrode has a sulfur content of at most 4,000 ppm and a specific surface area ratio of greater than 5.5 and at most 11.0 calculated by the following formula:
• the specific surface area ratio =BET/CALC;
• wherein BET (Brunauer-Emmett-Teller) is a specific surface area having units of m2/g determined by a BET method, and CALC is a value obtained by a formula:
• 6/(Dv50×ρBt), wherein Dv50 is average particle size having units of μm and ρBt is butanol true density having units of g/cm3.