Patent ID: 7208248

Claim:
A negative electrode for lithium secondary battery, comprising: a current collector having provided thereon an active material layer comprising an active material and an organic material having binding and thickening effects, wherein (1) the active material is in such a carbonaceous powder form that when a dispersion prepared by dispersing 100 g of the active-material powder in 200 g of water together with 2 g of carboxymethyl cellulose is examined by the grind gauge method for determining the degree of dispersion in accordance with JIS K5400, the maximum dispersed particle diameter is 50 μm or smaller, (2) the active material layer has a thickness of 50 μm or smaller, and (3) the active material layer has an arithmetic mean roughness (Ra) as measured in accordance with JIS B0601 of 5 μm or smaller; wherein the active material comprises an amorphous material in which an interplanar spacing d 002 for a crystal face (002) is 0.349 nm or larger and a thickness of superposed layers L c is smaller than 10 nm.