| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a negative electrode material for a lithium secondary battery capable of obtaining a lithium secondary battery having a large charge/discharge capacity and excellent charge discharge cycle characteristics, and to provide a negative electrode for the lithium secondary battery and the lithium secondary battery using the negative electrode material. <P>SOLUTION: The negative electrode material for the lithium secondary battery includes Si particles and a plurality of kinds of carbonaceous materials, the average particle diameter (D50) of the Si particles is 0.05-1 μm, and the porosity of a layer including the negative electrode material is 25-50 vol.%. A layer containing the negative electrode material: 10 wt.% polyvinylidene fluoride to the weight of the negative electrode material and 30 wt.% N-methylpyrrolidone to the weight of the negative electrode material are added to the negative electrode material for the lithium secondary battery and kneaded, and the kneaded material is coated, dried, and rolled at 1.0 Mpa to obtain the material. <P>COPYRIGHT: (C)2009,JPO&INPIT |
