| abstract |
Provided are a polyanion-type positive electrode active material capable of improving the initial efficiency of a battery using a carbon material capable of occluding and releasing lithium ions as a negative electrode, and a non-aqueous electrolyte battery using the same. By using lithium cobalt iron phosphate represented by the general formula Li y Fe (1-x) Co x PO 4 (0 <x ≦ 0.05, 0 ≦ y ≦ 1.2) as the positive electrode active material, Compared with the case of using Li y FePO 4 containing no Co, the initial efficiency can be improved. According to the present invention, a lithium secondary battery having excellent battery performance can be provided by using a thermally stable polyanionic positive electrode active material. The battery is particularly suitable for application in fields where high capacity and high output are required, and its industrial applicability is extremely large. [Selection figure] None |