NEGATIVE ELECTRODE ACTIVE MATERIAL FOR NONAQUEOUS ELECTROLYTE SECONDARY BATTERY, AND NONAQUEOUS ELECTROLYTE SECONDARY BATTERY

Provided is a technique that allows curtailing decreases in the durability of a nonaqueous electrolyte secondary battery. A negative electrode active material disclosed here is a particulate negative electrode active material (10) used in a nonaqueous electrolyte secondary battery (100). The negative electrode active material (10) contains graphite particles (11) which are aggregates of scaly graphite (11a), and carbon black (12). The carbon black (12) is present in internal voids (11s) of the graphite particles (11), and part of the carbon black (12) accumulates on the surface of the graphite particles (11) thereby forming a carbon coating portion (13).