Abstract: A non-aqueous electrolyte secondary battery has a positive electrode (11) containing a positive electrode active material, a negative electrode (12) containing a negative electrode active material, and a non-aqueous electrolyte solution (14) in which a solute is dissolved in a non-aqueous solvent. The positive electrode active material is obtained by sintering a titanium-containing oxide on a surface of a layered lithium-containing transition metal oxide represented by the general formula Li1+xNiaMnbCocO2+d, where x, a, b, c, and d satisfy the conditions x+a+b+c=1, 0.7?a+b, 0?x?0.1, 0?c/(a+b)<0.35, 0.7?a/b?2.0, and ?0.1?d?0.1.

Abstract: A non-aqueous electrolyte secondary battery includes: a positive electrode containing a positive electrode active material, a negative electrode containing a negative electrode active material; and a non-aqueous electrolyte having lithium ion conductivity. The positive electrode includes a lithium-containing transition metal oxide having a layered structure and being represented by the general formula Li1+x(NiaMnbCoc)O2+?, where x+a+b+c=1, 0.7?a+b, 0?x?0.1, 0?c/(a+b)<0.35, 0.7?a/b?2.0, and ?0.1???0.1. The non-aqueous electrolyte contains a lithium salt having an oxalato complex as an anion.