| 摘要 |
A lithium ion secondary battery comprising: a positive electrode; a negative electrode; and a non-aqueous electrolyte, the positive electrode comprising a positive electrode active material and a binder, the positive electrode active material comprising a lithium-containing composite oxide represented by the chemical formula: <?in-line-formulae description="In-line Formulae" end="lead"?>Li<SUB>a</SUB>(Co<SUB>1-x-y</SUB>Mg<SUB>x</SUB>M<SUB>y</SUB>)<SUB>b</SUB>O<SUB>c</SUB><?in-line-formulae description="In-line Formulae" end="tail"?> where M is at least one selected from Ni, Mn and Al, 0<=a<=1.05, 0.005<=x<=0.025, 0<=y<=0.25, 0.85<=b<=1.1, and 1.8<=c<=2.1. |
