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Abstract

A process for producing a compound of the formula LiM.sup.3+ O.sub.2 (wherein M.sup.3+ Ni.sup.3+ is or/and Co.sup.3+) or LiMn.sub.2 O.sub.4 is provided which comprises the steps of reacting a basic metal salt represented by the formula M.sup.2+ (OH).sub.2-nx (A.sup.n-).sub.x .multidot.mH.sub.2 O (wherein M.sup.2+ is at least one member selected from among Ni.sup.2+, Co.sup.2+ and Mn.sup.2+, A.sup.n- is an n-valent anion (provided that n is 1 to 3), such as NO.sub.3.sup.-, Cl.sup.-, Br.sup.-, CH.sub.3 COO.sup.- and CO.sub.3.sup.2- and x and m are positive numbers respectively satisfying 0.03.ltoreq.x.ltoreq.0.3 and 0.ltoreq.m.ltoreq.2) with an alkaline water-soluble lithium compound in a molar ratio of Li/M.sup.2+ of 0.3 to 1.3 in an aqueous medium to obtain a slurry, drying the obtained slurry, and firing the resultant residue at about 500.degree. C. or higher in an oxidative atmosphere. This process ensures production of the LiM.sup.3+ O.sub.2 and LiMn.sub.2 O.sub.4, which are highly purified and have high crystallization degrees, in large quantities on a commercial scale. The thus produced LiNi.sup.3+ O.sub.2 exhibits excellent charge-discharge characteristics as an active material of a positive electrode of a secondary battery.

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