| 摘要 |
The present invention relates to a negative electrode active material for a lithium ion secondary battery having nanosilicon dispersed on a conducting material and a carbon complex, wherein the negative electrode active material comprises: a nano-silicon (2), a conductive material (3) and a coke (4). The nano-silicon particles are dispersed in the conductive material (3), and the relative weight ratio of the nano-silicon (2) and the conductive material (3) is in the range of 1:0.3 to 1:5. A manufacturing method of a negative electrode active material for a lithium ion secondary battery according to the present invention comprises: a step of mixing the nano-silicon in a pitch after dispersing the nano-silicon in conductive carbon black or a carbon nano-tube; and a step of forming the nano-silicon and a carbon complex by heat treatment at 600 to 1500°C. |
