LITHIUM SECONDARY BATTERY, ACTIVE SUBSTANCE FOR NEGATIVE ELECTRODE THEREOF AND NEGATIVE ELECTRODE THEREOF

摘要

PROBLEM TO BE SOLVED: To provide a highly safe and durable lithium secondary battery for which enhancement of high output/high input performance by reduction of the thickness of active substance layer can be realized.

SOLUTION: There is provided an active substance of carbonaceous powder for negative electrode of lithium secondary battery. With respect to a dispersion obtained by dispersing 100 g of active substance powder together with 2 g of carboxymethyl cellulose in 200 g of water, the grain diameter at graining initiation as measured on the basis of dispersion degree according to the grind(fineness) gauge method defined in JIS K5400 is 50 μm or less. There is further provided a negative electrode of lithium secondary battery comprising a current collector, and, superimposed thereon, an active substance layer containing an active substance and an organic material capable of exerting binding and thickening effects. The active substance layer has a thickness of 50 μm or less and an arithmetic mean roughness(Ra) of 5 μm or less measured in accordance with JIS B0601. The provided lithium secondary battery comprises this negative electrode.

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