| 摘要 |
PROBLEM TO BE SOLVED: To provide a lithium ion secondary cell capable of obtaining a capacity that cannot be achieved by a conventional lithium ion secondary cell. SOLUTION: It manufactures a lithium ion secondary cell by employing as a positive electrode activating material a composite oxide of Li-Co system in the shape of particle where an average particle diameter is equal to or more than 10 μm and the numerical value obtained by dividing the multiplication of the average particle diameter with the specific surface area by 20 is 7-9, employing as a conductive material for a positive pole a mixture a large size conductive material with a small size conductive material, employing as a negative pole activating material a graphitization carbon where the specific surface area is equal to or more than 2.0 m2/g, a surface-to-surface distance of crystallization lattice is less than or equal to 0.3380 nm, and a crystallite numerical value in C axis direction is equal to or more than 30 nm, and employing as an electrolyte solvent a mixing solvent at least one kind selected from diethyl carbonate and ethyl methyl carbonate with ethylene carbonate, propylene carbonate and dimethyl carbonate. |
