NON-AQUEOUS ELECTROLYTE SECONDARY BATTERY-USE CATHODE MATERIAL, PRODUCTION METHOD THEREFOR, NON-AQUEOUS ELECTROLYTE SECONDARY BATTERY-USE CATHODE AND NON-AQUEOUS ELECTROLYTE SECONDARY BATTERY USING THE CATHODE MATERIAL

摘要

In order to provide a nonaqueous electrolyte secondary battery negative electrode material that has an excellent discharging capacity, the charge/discharge efficiency and the charge load characteristics, a manufacturing method thereof, a nonaqueous electrolyte secondary battery negative electrode with the negative electrode material and a nonaqueous electrolyte secondary battery, the invention provides a nonaqueous electrolyte secondary battery negative electrode material including graphite particles that have a block-like structure where a plurality of flat graphite fine particles assembles or bonds non-parallel with each other, the aspect ratio of 5 or less and a volume of fine pores in the range of 10 to 10 5 nm in a volume of 400 to 2000 cm 3 /kg; and a layer of carbon formed on a surface of the graphite particle, wherein a ratio (by weight ratio) of the layer of carbon to the graphite particle is in the range of 0.001 to 0.01, a manufacturing method thereof, a nonaqueous electrolyte secondary battery negative electrode with the negative electrodematerial and a nonaqueous electrolyte secondary battery.