| 摘要 |
PROBLEM TO BE SOLVED: To provide a lithium secondary battery having a small irreversible capacity, when it is initially charged and discharged, and having superior charge and discharge cycle characteristics, a negative electrode material capable of constituting the lithium secondary battery, and to provide a manufacturing method therefor. SOLUTION: This negative electrode material for the lithium secondary battery contains graphite of which the R value, that is the peak intensity ratio in 1,360 cm<SP>-1</SP>with respect to a peak intensity in 1,580 cm<SP>-1</SP>in an argon ion laser Raman spectrum, is 0.1-0.5, and of which the plane spacing d<SB>002</SB>of a 002 plane is 0.338 nm or less, and an a natural polysaccharide or its derivative for covering a surface thereof, and this lithium secondary battery includes a negative electrode containing the negative electrode material. The negative electrode material is obtained by the manufacturing method, having a process for dispersing the graphite, in a solution with the natural polysaccharide or its derivative dissolved in water. COPYRIGHT: (C)2011,JPO&INPIT
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