NEGATIVE ELECTRODE ACTIVE MATERIAL FOR RECHARGEABLE BATTERY WITH NONAQUEOUS ELECTROLYTE AND PROCESS FOR PRODUCING NEGATIVE ELECTRODE ACTIVE MATERIAL FOR RECHARGEABLE BATTERY WITH NONAQUEOUS ELECTROLYTE

摘要

Disclosed is a negative electrode active material for a rechargeable battery with a nonaqueous electrolyte, comprising a carbon material using at least one of a petroleum heavy oil and a coal heavy oil as a raw material and a phosphorus compound. The negative electrode active material for a rechargeable battery with a nonaqueous electrolyte is produced so as to satisfy the requirement that the spacing between crystal planes (d002) is not less than 0.340 nm, the size of crystallites in a C axis direction (Lc (110)) is not more than 5 nm, the ratio of intensity of a diffraction peak at a wavelength near 1360 cm-1 as measured by Raman spectroscopy to a diffraction peak at a wavelength near 1580 cm-1, i.e., R1 = I1360/I1580, is larger by 1% to 40% than the ratio of intensity (R0 = I1360/I1580) in a material that is the same as the active material except that the phosphorus compound is not contained.