C - Chemistry – Metallurgy – 01 – G
Patent
C - Chemistry, Metallurgy
01
G
C01G 53/04 (2006.01) C01G 45/00 (2006.01) C01G 45/02 (2006.01) C01G 51/00 (2006.01) C01G 51/04 (2006.01) C01G 53/00 (2006.01) H01M 4/32 (2006.01) H01M 4/50 (2006.01) H01M 4/52 (2006.01)
Patent
CA 2137081
A process for producing a compound of the formula LiM3+O2 (wherein M3+ is Ni3+ or/and Co3+) or LiMn2O4 is provided which comprises the steps of reacting a basic metal salt represented by the formula M2+(OH)2-nx(A n- )x .cndot. mH2O (wherein M2+ is at least one member selected from among Ni2+, Co2+ and Mn2+, A n- is an n-valent anion (provided that n is 1 to 3), such as NO3-, Cl-, Br-, CH3COO- and CO3 2-, and x and m are positive numbers respectively satisfying 0.03<=x<=0.3 and 0<=m<2) with an alkaline water-soluble lithium compound in a molar ratio of Li/M2+ 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°C or higher in an oxidative atmosphere. This process ensures production of the LiM3+O2 and LiMn2O4, which are highly purified and have high crystallization degrees, in large quantities on a commercial scale. The thus produced LiNi3+O2 exhibits excellent charge-discharge characteristics as an active material of a positive electrode of a secondary battery.
Murakami Tatsuo
Ueda Masami
Shapiro Cohen
Toda Kogyo Corporation
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