MULTILAYER-STRUCTURE CARBON MATERIAL FOR NONAQUEOUS SECONDARY BATTERIES, NEGATIVE ELECTRODE FOR NONAQUEOUS SECONDARY BATTERIES USING SAME, AND NONAQUEOUS SECONDARY BATTERY

摘要

A multilayer-structure carbon material for nonaqueous secondary batteries, which is obtained by coating at least a part of the surface of graphite particles with a carbonaceous material and satisfies the conditions (1)-(3) described below. (1) The average particle diameter (d50) of the multilayer-structure carbon material is from 19.1 mum to 50 mum (inclusive). (2) The circularity of the multilayer-structure carbon material is 0.88 or more. (3) The ratio of the rolling load (P) as defined below to the d50 of the multilayer-structure carbon material, namely P/d50, is 30 or less. P = (the linear pressure (kg/5 cm) necessary for rolling a negative electrode active material layer using the multilayer-structure carbon material under specific conditions)