| 摘要 |
PROBLEM TO BE SOLVED: To provide a negative electrode material for nonaqueous electrolytic liquid secondary battery superior in discharge capacity, charge and discharge efficiency, low-temperature charge characteristics, cycle characteristics, and high density of the electrode by maintaining features of non-orientation graphite particles, a negative electrode, and a nonaqueous electrolytic liquid secondary battery. SOLUTION: The negative electrode material has a massive structure in which a plurality of flat-shape graphite particulates are collected or joined mutually unparallel. The average particle size (50%D) is 10μm or more and 50μm or less, aspect ratio is 5 or less, true specific gravity is 2.22 or more, bulk density is 800 kg/m<SP>3</SP>or more and 1,000 kg/m<SP>3</SP>or less, specific surface area measured in BET method is 2.0 m<SP>2</SP>/g or more and 4.0 m<SP>2</SP>/g or less, in Raman spectrum analysis using argon laser of a wavelength 5,145Å, R value in a formula (1): R value=I<SB>1350</SB>/I<SB>1580</SB>is less than 0.2, and it has a heat generation peak at 550°C or more and 620°C or less in a differential thermal analysis in the air stream, and the peak area at temperature increase 5°C/min is 100 (μVs)/mg or more and 500 (μVs)/mg or less. COPYRIGHT: (C)2008,JPO&INPIT |
