NOVELTY - A negative electrode comprises a negative electrode active material layer containing negative electrode active material and formed on surface of a negative electrode collector. The negative electrode active material contains 3-40 wt.% silicon material and 40-95 wt.% carbon material. The negative electrode active material layer contains binder chosen from polyvinylidene fluoride, styrene-butadiene rubber, polyimide, polyamidoimide, and polymer containing at least one carboxylic acid group in unit structure.    USE - Negative electrode is used for electrical device e.g. lithium ion secondary battery (all claimed). Uses include but are not limited to electric vehicle, fuel cell vehicle, hybrid electric vehicle, passenger car, truck, bus, notebook personal computer, electric train, mobile telephone and power supply for mounting etc.    ADVANTAGE - The reliable lithium ion secondary battery using the negative electrode has excellent cycle characteristics and durability. The negative electrode has improved dispersibility of solid content in slurry, and reduced uneven distribution of negative electrode active material in inside of negative electrode active material layer.    DETAILED DESCRIPTION - A negative electrode comprises a negative electrode active material layer containing negative electrode active material and formed on surface of a negative electrode collector. The negative electrode active material contains 3-40 wt.% silicon material and 40-95 wt.% carbon material. The silicon material is silicon oxide (SiOx, where x is number of oxygen which satisfies valence of silicon), silicon-containing alloy, amorphous silicon dioxide particles and/or silicon particles. The total amount of silicon material and carbon material is 80-98 wt.%. The negative electrode active material layer contains binder chosen from polyvinylidene fluoride, styrene-butadiene rubber, polyimide, polyamidoimide, and polymer containing at least one carboxylic acid group in unit structure. An INDEPENDENT CLAIM is included for electrical device.