Patent ID: 10446837

Abstract:
A negative electrode active material for a non-aqueous electrolyte secondary battery, including negative electrode active material particles containing a silicon compound expressed by SiOx where 0.5≤x≤1.6, the negative electrode active material particles at least partially coated with a carbon coating, the carbon coating exhibiting a specific surface area ranging from 5 m2/g to 1000 m2/g, the specific surface area being measured by a multipoint BET method after the carbon coating is separated from the negative electrode active material particles, the carbon coating exhibiting a compression resistivity ranging from 1.0×10−3 Ω·cm to 1.0 Ω·cm when the carbon coating is compressed so as to have a density of 1.0 g/cm3, the compression resistivity being measured after the carbon coating is separated from the negative electrode active material particles. This negative electrode active material can increase the battery capacity and improve the cycle performance and battery initial efficiency.