Negative electrode material for nonaqueous electrolyte secondary battery and method for producing the same

摘要

A cathode material comprises a lithium-containing composite nitride (1). A cathode material comprises a lithium-containing composite nitride (1), given by Li3-x-yAyMxN; A : alkaline metal except for lithium and alkaline earth metals; M : transition metal; x : greater than or equal to 0.2 and less than or equal to 0.8; and y : greater than 0 and less than or equal to 0.8. Independent claims are included for the following: (1) Method for producing cathode material which involves synthesizing core particles made of a lithium-containing composite nitride (2) represented by Li3-xMxN, where M is a transition metal and x is greater than or equal to 0.2 and less than or equal to 0.8, mixing the core particles with a fine powder of a lithium-containing composite nitride (1), and applying mechanical energy to the mixture to form surface layers made of a lithium-containing composite nitride (1) on the surfaces of the respective core particles by mechanochemical reaction; and (2) Non-aqueous electrolyte secondary battery comprising a lithium-containing composite nitride (1).