Transition metal oxide containing solid solution lithium, non-aqueous electrolyte secondary battery positive electrode and non-aqueous electrolyte secondary battery

Abstract

A transition metal oxide containing solid solution lithium contains a transition metal oxide containing lithium, which is represented by a chemical formula: Li[NiCoMn[Li]]Owhere 0<a<1.4; 0≦b<1.4; 0<c<1.4; 0.1<d≦0.4; a+b+c+d=1.5; and 1.1≦a+b+c<1.4. The transition metal oxide containing lithium includes: a layered structure region; and a region changed to a spinel structure by being subjected to charge or charge/discharge in a predetermined potential range. When a ratio of an entire change from LiMnOwith a layered structure in a region to be changed to the spinel structure to LiMnOwith the spinel structure is defined to be 1, a spinel structure change ratio of the transition metal oxide containing lithium is 0.25 or more to less than 1.0.