| 摘要 |
PURPOSE: To provide a coin type secondary battery having a high capacity efficiency by arranging so that the current to be taken out for the mating areas of a positive and a negative electrode is over 5mA/cm<2> and the separator thickness vs battery capacity ratio is over 0.008 mm/mAh. CONSTITUTION: A coin type lithium secondary battery includes a positive electrode 1 and a negative electrode 2, wherein the latter 2 is formed by processing with a pressure into a disc having a diameter as 70% of the specified diameter of the battery. A negative electrode black mix is prepared by mixing PVDF as binder with graphite in the mix proportion 90:10. A positive electrode can 5 is made in a cylindrical shape of specified height and diameter from stainless steel having a specified thickness and hardness. A positive electrode electricity collector 6 is made in a stainless steel meshing, and a negative electrode can 7 is made of stainless steel having a specified thickness and hardness, and the surface is subjected to nickel plating. A negative electrode electricity collector 8 is made in a stainless steel meshing and spot welded to the inner surface of the negative electrode can 7, and the negative electrode 2 is attached by pressure to this negative electrode electricity collector 8. |
