NEGATIVE ELECTRODE MATERIAL FOR NONAQUEOUS ELECTROLYTE SECONDARY BATTERY AND METHOD FOR PRODUCING THE SAME

摘要

PROBLEM TO BE SOLVED: To provide: a negative electrode material for a nonaqueous electrolyte secondary battery, high in capacity and excellent in initial charge/discharge efficiency and cycle characteristics; a method for producing the negative electrode material for a nonaqueous electrolyte secondary battery; and a nonaqueous electrolyte secondary battery manufactured using the negative electrode material for a nonaqueous electrolyte secondary battery.SOLUTION: A negative electrode material for a nonaqueous electrolyte secondary battery includes a silicon-carbon composite material. A method for producing the negative electrode material for a nonaqueous electrolyte secondary battery includes the steps of: preparing silicon nanoparticles; preparing a silicon-carbon composite material including the silicon nanoparticles and a carbonaceous material; and subjecting the silicon-carbon composite material to thermal-compression treatment.