Method of producing an electrode for a lithium secondary battery, and method of producing a lithium secondary battery

Abstract

A method of producing an active material for a lithium secondary battery, by which impurities causing problems in synthesizing an active material for a lithium secondary battery, including a lithium transition metal oxyanion compound are removed efficiently and enhancement of an energy density is realized, is provided. By cleaning the active material for a lithium secondary battery, including a lithium transition metal oxyanion compound, with a pH buffer solution, for example, it is possible to efficiently remove just only impurities such as Li 3 PO 4 or Li 2 CO 3 , or a substance, other than LiFePO 4 , in which the valence of Fe is bivalent such as FeSO 4 , FeO or Fe 3 (PO 4 ) 2 without dissolving Fe of LiFePO 4 .

1 . A method of producing an electrode for a lithium secondary battery comprising a step of producing an electrode active material by a method comprising preparing an active material including a lithium transition metal oxyanion compound, and cleaning said active material with a pH buffer solution. 
     
     
         2 . A method of producing a lithium secondary battery comprising combining a negative electrode and a nonaqueous electrolyte with a positive electrode produced by a method comprising a step of producing an electrode active material by preparing an active material including a lithium transition metal oxyanion compound, and cleaning said active material with a pH buffer solution.