| 摘要 |
PROBLEM TO BE SOLVED: To provide a nonaqueous electrolyte secondary battery excellent in the high-rate discharging characteristic and having high safety at the end of its life by specifying the materials constituting a positive electrode and their composition. SOLUTION: This battery is constituted of a rechargeable positive electrode, a negative electrode, and a nonaqueous electrolyte. A positive electrode mix containing scale-like graphite of 3-8 pts.wt. as a conductive material, a tetrafluoroethylene-hexafluoroethylene copolymer of 4-10 pts.wt. as a binder against a positive electrode active material of 100 pts.wt. is used. A core material is coated with the positive electrode mix, then it is heat-treated at 100-250 deg.C to manufacture the positive electrode. When this positive electrode is used, the battery having a small impedance, excellent in the high-rate discharge characteristic, and having high safety at the life end of the charge/discharge cycle is obtained. |
