| 摘要 |
PROBLEM TO BE SOLVED: To provide a secondary nonaqueous electrolyte lithium ion battery having an excellent charging and discharging cycle characteristic by containing salt in any one of a space on a positive electrode, a space on a negative electrode, lithium salt contained nonaqueous electrolyte and a space inside a battery can. SOLUTION: A collector is coated with the electrode mix, which contains the active material, and after laminating the obtained sheet-like positive electrode and negative electrode and a band-shaped separator, they are spirally wound, and inserted into a battery can, and the inside of the battery can is filled with the nonaqueous electrolyte, which contains the lithium salt, so as to form a cylindrical nonaqueous secondary battery. At this stage, the salt is contained in either one of the space on the positive electrode sheet, the space on the negative electrode sheet, the nonaqueous electrolyte, or the space inside the battery can. As the salt, the salt of alkaline metal or alkaline earth metal, or the salt of carbonic acid, oxalic acid, nitric acid, acetic acid, phosphoric acid, and boric acid is desirable, and the salt at 0.02-10% by weight in relation to the positive electrode active material is desirable exists, besides the active material. LiBF4 at 1-50% by mole in relation to the whole of the supporting salt desirably exists in the nonaqueous electrolyte. |
