| 摘要 |
PROBLEM TO BE SOLVED: To provide a negative electrode with high voltage, high energy density, high cycle characteristics, and high high-rate discharge characteristics by constituting with natural graphite serving as a negative active material, porous carbon powder serving as an additive, and a binder. SOLUTION: Natural graphite powder, porous carbon powder such as acetylene black and carbon black, and a binder such as a fluorine polymer compound, a thermoplastic resin, a polymer compound having rubber elasticity, and a synthetic adhesive material are mixed, slurry is formed, and the slurry is applied to both surfaces of a current collector made of a metal foil to form a negative electrode. The porous carbon powder retains an electrolyte and acts so as to supply it to the natural graphite in accordance with its necessity, lithium ions are smoothly inserted into/released from the layers of the natural graphite, and lithium ions are quickly moved even in high rate discharge. The high rate discharge characteristics of the negative electrode are enhanced. |
