Non-aqeous electrolyte secondary battery

Abstract

A non-aqueous electrolyte secondary battery has a positive electrode containing a positive electrode active material containing a lithium-containing oxide active material, a negative electrode, and a non-aqueous electrolyte. The lithium-containing oxide active material is represented by the general formula Li a Mg b MO 2±α where 0.65≦a≦1.05, 0<b≦0.3, 0≦α≦0.3, and M is at least one of manganese and cobalt.

1 . A non-aqueous electrolyte secondary battery comprising: a positive electrode containing a positive electrode active material comprising a lithium-containing oxide active material; a negative electrode; and a non-aqueous electrolyte, wherein: the lithium-containing oxide active material is represented by the general formula Li a Mg b MO 2±α  where 0.65≦a≦1.05, 0<b≦0.3, 0≦α≦0.3, and M is at least one of manganese and cobalt; and the lithium-containing oxide active material has a main peak at 2θ=17.95° to 18.15°, as determined by an X-ray powder crystal diffraction measurement (Cukα). 
     
     
         2 . The non-aqueous electrolyte secondary battery according to  claim 1 , wherein the lithium-containing oxide active material is represented by the general formula Li a Mg b Mn x Co y O 2±α , where 0.65≦a≦1.05, 0<b≦0.3, 0.45≦x≦0.55, 0.45≦y≦0.55, 0.90≦x+y≦1.10, and 0≦α≦0.3. 
     
     
         3 . The non-aqueous electrolyte secondary battery according to  claim 1 , wherein the lithium-containing oxide active material has a crystal structure belonging to an O2 structure, a T2 structure, an O6 structure, or a mixed structure thereof. 
     
     
         4 . The non-aqueous electrolyte secondary battery according to  claim 2 , wherein the lithium-containing oxide active material has a crystal structure belonging to an O2 structure, a T2 structure, an O6 structure, or a mixed structure thereof. 
     
     
         5 . The non-aqueous electrolyte secondary battery according to  claim 1 , wherein 0<b≦0.2. 
     
     
         6 . The non-aqueous electrolyte secondary battery according to  claim 2 , wherein 0<b≦0.2. 
     
     
         7 . The non-aqueous electrolyte secondary battery according to  claim 3 , wherein 0<b≦0.2. 
     
     
         8 . The non-aqueous electrolyte secondary battery according to  claim 4 , wherein 0<b≦0.2. 
     
     
         9 - 16 . (canceled)