PURPOSE: To enhance the charge and discharge capacity of a secondary battery by using LiMO2 (M=Ni, Co) and LiMn2O4 as positive electrode active materials in the secondary battery which uses composite oxides of lithium and nickel or the like as positive electrode active materials and metal lithium or lithium carbon as negative electrode active material.
CONSTITUTION: 0.1mol (24.88g) nickel acetate tetrahydrate and 0.102mol (0.673g) lithium acetate, for example, are mixed with 50ml ethylene glycol and heat dissolved, and heating is continued until the odor of acetate is removed. Heating is further continued to vaporize the ethylene glycol and the mixture is solidified after passing through a consistent liquid state. To remove organic substances the mixture is heat treated in air at 400°C for three hours, and powders obtained are ground and burned in an oxygen flow at 700°C for five hours and are further burned in an oxygen flow at 800°C for five hours to obtain LiNiO2. The amount of solvent used is thus reduced so as to enable mass production.
NOGUCHI HIDEYUKI
OZAWA AKIHISA
NOGUCHI HIDEYUKI
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