| 摘要 |
PROBLEM TO BE SOLVED: To ensure high capacity of a battery by restricting a discharge capacity per unit reaction area of an electrode. SOLUTION: A negative electrode having a carbon material as active substance and a positive electrode having a lithium composite oxide as active material are laminated in three or more layers and is stored in a battery case. An electrode thickness and the number of laminates are determined so that the discharge capacity per unit reaction area of the electrode laminate is 6 to 100mAh/cm<2> . Thereby, high capacity of a battery can be ensured. Restriction of this discharge capacity ensures high capacity during light load, and good characteristics can be obtained even during practical load of about 5 hours %. When the discharge capacity is more than 100mAh/cm<2> , the number of laminates is reduced, and satisfactory characteristics cannot be obtained in an ordinary rectangular or cylindrical secondary battery. When the discharge capacity is less than 6mAh/cm<2> , the number of laminates is increased, and the capacity is similar to that of a conventional battery. Consequently, the discharge capacity is restricted in this range and preferably 6 to 30mAh/cm<2> . |
