Negative Electrode Active Material for Nonaqueous Electrolyte Secondary Batteries

摘要

Provided is a novel negative electrode for nonaqueous electrolyte secondary batteries, which is capable of improving cycle characteristics and is also capable of suppressing aggregation of active material particles in a slurry. The negative electrode active material for nonaqueous electrolyte secondary batteries, which contains silicon and has a D50 of 0.1 μm to 5 μm, and the amount of water measured at 120° C. to 300° C. by the Karl-Fischer method (referred to as “amount of water”) per specific surface area (referred to as “CS”), that is, the amount of water/CS, of 0.1 to 80 ppm/(m2/cc).

主权项

1. A negative electrode active material for nonaqueous electrolyte secondary batteries, the active material comprising silicon,
wherein a D50 according to a laser diffraction scattering type particle size distribution analysis method is 0.1 μm to 5 μm, and an amount of water measured by a laser diffraction particle size distribution analyzer at 120° C. to 300° by a Karl-Fischer method per specific surface area (CS), that is, an amount of water/CS, is 5 to 80 ppm/(m2/cc) wherein the negative electrode active material for nonaqueous electrolyte secondary batteries is obtained by a method other than heating raw material of metal to obtain a molten metal, solidifying the molten metal and then grinding the solidified metal by a mechanical alloying method in an inert gas atmosphere or in a vacuum atmosphere.