NEGATIVE-ELECTRODE ACTIVE MATERIAL FOR SECONDARY BATTERY

摘要

[PROBLEMS] To provide a storage battery, i.e., secondary battery, which is improved in the coefficient of use of active material and has a high energy density, by using raw materials having the same cost as those for conventional storage batteries especially as the negative-electrode plate of a secondary battery. [MEANS FOR SOLVING PROBLEMS] A negative-electrode active material for the secondary battery is provided, which is a kneaded mixture comprising: a raw active material comprising a metal and an oxide of the metal; and carbon, the carbon being contained in such an amount that the total oil absorption thereof is at least 4.7 mL per mol of the raw active material. The kneaded mixture contains no sulfuric acid radicals or contains sulfuric acid radicals in an amount of 7x10^-2 mol or smaller per mol of the raw active material. The negative-electrode active material, in the state of having not undergone formation, has a bulk density of 2.2x10^-1 to 5x10^-1 mL/g. The carbon may be acetylene black or furnace carbon.