| 摘要 |
PROBLEM TO BE SOLVED: To provide a carbon material with less irreversible capacity and large discharge capacity by using a resin mainly containing xylenol as a unit skeleton as a raw material of a slightly graphitizable carbon porous body. SOLUTION: As a raw material of a slightly graphitizable carbon material, a slightly graphitizable carbon porous body using a resin mainly containing xylenol as a unit skeleton is used. Especially, xylenol resin having a unit skeleton of each single isomer of xylenol or mixture is preferably used as the raw material of the slightly graphitizable carbon material. The slightly graphitizable carbon material for lithium ion secondary battery is the slightly graphitizable carbon material made of xylenol resin having this skeleton, and is formed by depositing thermally decomposed carbon. At this time, when a powder body of the slightly graphitizable carbon body is formed, the thermally decomposed carbon is deposited using the powder body as a base material, and an open pore with an optimal volume is formed as a lithium ion storage site, this becomes a small diameter inlet through which lithium ion in electrolyte can travel and an organic solvent in electrolyte cannot travel, and has less irreversible capacity. |
