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

摘要

In nonaqueous electrolyte secondary batteries that use silicon or silicon oxide as a negative electrode active material, the initial charge-discharge efficiency and the cycle characteristics are improved. A negative electrode active material particle (13a) is a particulate negative electrode active material used for nonaqueous electrolyte secondary batteries, and includes a base particle (14) composed of silicon or silicon oxide and a conductive coating layer (15) that coats at least part of a surface of the base particle (14). A pore (16) is formed in the particle. The pore (16) preferably includes an interfacial pore (16z) formed between the base particle (14) and the coating layer (15).

主权项

1. A particulate negative electrode active material used for a nonaqueous electrolyte secondary battery the negative electrode active material comprising:
a particle composed of silicon or silicon oxide; and a conductive coating layer that coats at least part of a surface of the particle, wherein pores are formed in the particle.