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First, lithium nitrate, nickel formate, and nickel nitrate were prepared as the compounds of metal elements constituting the lithium nickel complex oxide as the cathode active material for a lithium secondary battery, lithium formate,. Then, 1.0 mol of lithium formate or lithium nitrate and 1.0 mol of nickel nitrate or nickel nitrate were precisely weighed, placed in a vessel, and after adding thereto 4,950 ml of water and 50 ml of nitric acid having a concentration of 60% and a specific gravity of 1.38 or 4,900 ml of water and 100 ml of hydrogen peroxide or 5,000 ml of water only, the mixture was stirred to dissolve the salts. The nitric acid or hydrogen peroxide is a material generating oxygen at the spray pyrolysis, that is, an oxygen-generating material.

1. customplaced in a vessel
2. additionafter adding
3. dissolutionto dissolve the salts