PRODUCTION OF POSITIVE ELECTRODE ACTIVE MATERIAL NICKEL ACID LITHIUM FOR NUN-AQUEOUS SECONDARY BATTERY AND NON- AQUEOUS SECONDARY BATTERY

摘要

PROBLEM TO BE SOLVED: To provide a method for producing a positive electrode active material LiNiO2 for non-aq. secondary battery exhibiting stable charge-discharge characteristic at a low cost and effectively in the view point of resource and to provide a lithium ion secondary battery excellent in charge-discharge cycle characteristic. SOLUTION: An aq. solution is prepared by dissolving a water soluble lithium compound and a water soluble nickel compound in a buffer solution consisting of an organic acid and a lithium salt. Next, deposit is formed by adding oxalic acid thereinto. The formed deposit is filtered out from the aq. solution with filtration, centrifugal separation or the like. The resultant deposit is dried and fired to produce LiNiO2. Further, NiLiO2 is obtained by preparing the solution, after the deposit is filtered out, again into the state before oxalic acid is added, forming the precursor by the same method as that above mentioned and firing. The filtrate after the deposit is filtered out is circulated by repeating the operation.