| abstract |
(57) [Summary] [PROBLEMS] When a graphite material is used for a negative electrode of a non-aqueous solvent secondary battery, a high discharge capacity and high charge / discharge efficiency are realized, and at the same time, a good electrode structure is improved while improving electrode filling properties. Can be secured, PC The present invention provides a negative electrode capable of using an electrolyte solution containing, and enables the production of a lithium ion secondary battery having a large capacity and excellent rate characteristics, cycle stability, and low-temperature characteristics. A mesophase pitch is used as a raw material. A non-scale graphite powder produced by graphitization at a temperature of not less than ℃, wherein the optical structure is a mosaic structure, and the plane spacing d of crystallites in the C-axis direction in X-ray diffraction. 002 is 0.3358 nm or more, crystallite size Lc 002 is 100 nm or less, 136 in Raman scattering spectrum. A lithium salt was dissolved in a negative electrode using a graphite powder in which the intensity ratio (I1360 / I1580) of two Raman bands of 0 and 1580 cm -1 was 0.1 or more as a carbon material, and a nonaqueous solvent containing propylene carbonate. A non-aqueous solvent secondary battery using an electrolytic solution. |