CARBON MATERIAL FOR NEGATIVE ELECTRODE FOR LITHIUM ION RECHARGEABLE BATTERY, CARBON MATERIAL FOR NEGATIVE ELECTRODE FOR LOW CRYSTALLINE CARBON-IMPREGNATED LITHIUM ION RECHARGEABLE BATTERY, NEGATIVE ELECTRODE PLATE, AND LITHIUM ION RECHARGEABLE BATTERY

摘要

There is obtained a carbon material for lithium-ion secondary battery negative electrode, a low-crystalline carbon impregnated carbon material for lithium-ion secondary battery negative electrode, a negative electrode plate, and a lithium-ion secondary battery, each of which realizes a first charge/discharge cycle with less gas generation and provides a rapid charge/discharge. The carbon material is obtained by: blending and kneading a carbonaceous aggregate with a binder to form a composition; press molding the composition into an article; carbonizing the press molded article; graphitizing the article to obtain an artificial graphite block; milling the block; and carrying out particle size control. The carbon material has characteristics of: (1) R-value = (I 1360 /I 1580 ) ‰¥ 0.2, where R-value is defined by the ratio of D band to G band in Raman spectrum using Nd: YAG laser light of 532 nm wavelength; and (2) d(002) ‰¥ 0.336nm, and Lc(002) ‰¤ 50 nm, where d(002) and Lc(002) are crystallographic parameters calculated by Gakushin-method. The carbon material is used for the negative electrode plate of a lithium-ion secondary battery, and used in the lithium-ion secondary battery having therein the negative electrode plate.