| 摘要 |
A non-aqueous electrolyte secondary battery including a positive electrode, a negative electrode, a separator interposed between the positive electrode and the negative electrode, and an electrolyte, wherein the positive electrode comprises a positive electrode active material comprising a particle of a composite oxide represented by a general formula: Li<SUB>x</SUB>Me<SUB>1-y-z</SUB>M<SUB>y</SUB>L<SUB>z</SUB>O<SUB>2</SUB>. In the general formula, the element Me is at least one transition metal element except Ti, Mn, Y and Zr, the element M is at least one selected from the group consisting of Mg, Ti, Mn and Zn, and the element L is at least one selected from the group consisting of Al, Ca, Ba, Sr, Y and Zr, and 1<=x<=1.05, 0.005<=y<=0.1 (with a proviso that 0.005<=y<=0.5 is satisfied in the case of the element M being Mn) and 0<=z<=0.05 are satisfied. The separator includes a plurality of laminated monolayer films, the plurality of monolayer films each have a microporous structure, and a positive electrode-side monolayer film selected from the plurality of monolayer films which faces the positive electrode is made of polypropylene.
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