| 摘要 |
PROBLEM TO BE SOLVED: To prevent igniting and to enhance safety by housing a positive elec trode, using a lithium nickel composite oxide as an active material and a lithium ion movable organic electrolyte in a sealed container, and including a specified range at weight percent of vinylene carbonate in the organic electrolyte. SOLUTION: An electrode group, prepared by winding strip-shaped positive electrode and negative electrode via a separator 5, is put in a battery can 6, the terminal of a negative electrode current collector 3 is welded to the bottom, and an electrolyte is poured into the battery can 6. A positive tab terminal 8 is welded to a positive electrode current collector 1 and a positive electrode cap 7. The battery can 6 is sealed with the positive electrode cap 7 via an insulating gasket 9. A lithium nickel composite oxide represented by the general formula LiNixCoyOz (0.7<=x<=0.9, 0.1<=y<=0.3, x+y=1, 0.001<=z<=0.02) is used as a positive active material 2. In the electrolyte, as a solute 0.75-2.5 mol/1 LiPF6 is contained, and in addition, 1-20 wt.% vinylene carbonate is contained. |
