MIXED CARBON MATERIAL AND NEGATIVE ELECTRODE FOR NONAQUEOUS RECHARGEABLE BATTERY

摘要

Disclosed is a mixed carbon material that is a negative electrode material which can suppress a lowering in charge acceptability and high-temperature storage stability in a high-capacitance and high-density electrode.  The mixed carbon material contains a carbon material A comprising a core material of a graphite powder and an amorphous carbon and/or carbon having a turbostratic structure deposited on or covering the surface of the core material and a carbon material B of a graphite powder.  The compressibility measured as a packed material density (g/cm3) by filling 1.00 g of a material into a cylindrical mold having an inner diameter of 15 mm, pressing the material at a pressure of 8.7 kN, and reducing the pressure to 0.15 kN is 1.60 to 1.78 g/cm3 for the carbon material A and 1.75 to 1.85 g/cm3 for the carbon material B.  The compressibility of the carbon material A is smaller than that of the carbon material B, and the mixing ratio (carbon material A/carbon material B) is 1 to 9 in terms of mass ratio.