Lithium composite metal oxide having layered structure

Abstract

A layered structure lithium mixed metal oxide obtained by a method including a step of calcining a lithium mixed metal oxide raw material containing a transition metal element and a lithium element in a molar ratio of the lithium element to the transition metal element of 1 or more and 2 or less, in the presence of an inactive flux containing one or more compounds selected from the group consisting of a carbonate of M, a sulfate of M, a nitrate of M, a phosphate of M, a hydroxide of M, a molybdate of M, and a tungstate of M, wherein M represents one or more elements selected from the group consisting of Na, K, Rb, Cs, Ca, Mg, Sr and Ba.

1 . A layered structure lithium mixed metal oxide obtained by a method comprising:
 a step of calcining a lithium mixed metal oxide raw material comprising a transition metal element and a lithium element in a molar ratio of the lithium element to the transition metal element of 1 or more and 2 or less, in the presence of an inactive flux comprising one or more compounds selected from the group consisting of a carbonate of M, a sulfate of M, a nitrate of M, a phosphate of M, a hydroxide of M, a molybdate of M, and a tungstate of M, wherein M represents one or more elements selected from the group consisting of Na, K, Rb, Cs, Ca, Mg, Sr and Ba.   
     
     
         2 . A positive electrode active material comprising the layered structure lithium mixed metal oxide according to  claim 1 . 
     
     
         3 . A positive electrode comprising the positive electrode active material according to  claim 2 . 
     
     
         4 . A nonaqueous electrolyte secondary battery comprising the positive electrode according to  claim 3 . 
     
     
         5 . The nonaqueous electrolyte secondary battery according to  claim 4 , further comprising a separator. 
     
     
         6 . The nonaqueous electrolyte secondary battery according to  claim 5 , wherein the separator is made of a laminated film which has a heat resistant porous layer and a porous film laminated to each other.