| 摘要 |
PURPOSE:To provide a secondary battery maintaining high operating voltage and having an excellent charge/discharge characteristic by adding phosphorus to a composite oxide of lithium and cobalt mainly constituting a positive electrode active material. CONSTITUTION:To form a positive electrode 1, phosphorus of 1-5mol.% is added to LiCoO2 for an active material carbon black and tetrafluoroethylene are used for a conductive material and a binder, a water dispersion is mixed and coated on both faces of an aluminum foil, it is dried, roller, and cut, and a positive electrode lead plate 2 made of titanium is welded. To form a negative electrode 3, a carbon material is used for a main active material, an acrylic binder is mixed, it is coated on both faces of a copper foil, it is dried, rolled, and cut, a negative electrode lead plate 4 made of copper is spot-welded. The positive electrode 1 and the negative electrode 3 are spirally wound via a separator 5 made of a polypropylene porous film to constitute an electrode plate group, and a nonaqueous electrolyte is used for the electrolyte. |
