NONAQUEOUS ELECTROLYTE SECONDARY BATTERY

摘要

A nonaqueous electrolyte secondary battery comprising a negative electrode and positive electrode capable of lithium occlusion and release and, interposed therebetween, a separator and nonaqueous electrolyte, wherein the positive electrode contains a positive electrode active material of the formula: LiM1-xLxO2 (wherein the relationship 0.005<=x<=0.1 is satisfied; M is at least one member selected from the group consisting of Mn, Co and Ni, and L is at least one member selected from the group consisting of Mg, Al, Ti, Sr, Zn, B, Ca, Cr, Si, Ga, Sn, P, V, Sb, Nb, Ta, Mo, W, Zr, Y and Fe), and wherein the nonaqueous electrolyte contains a phosphinate compound of the formula (1) (wherein each of R<1>, R<2> and R<3> independently is an aryl or a C1-C5 alkyl, alkenyl or alkynyl).