Spinel type lithium-mangenese oxide material, process for prepar

Chemistry: electrical current producing apparatus – product – and – Current producing cell – elements – subcombinations and... – Electrode

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264603, 423599, C01G 4512, H01M 450

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active

058076468

ABSTRACT:
A novel lithium-manganese oxide composition suitable for use in lithium secondary batteries as an active material for positive electrodes, said oxide having a spinel type crystal structure, an Li:Mn molar ratio of 0.9-1.10:2.00, a mean Mn oxidation number of 3.40-3.60 valencies, and a BET specific surface area of at least 1 m.sup.2 /g, substantially all the primary particles of said oxide being less than 1 .mu.m; a process for preparing such an oxide and a lithium secondary battery containing such an oxide are also disclosed.

REFERENCES:
patent: 4828834 (1989-05-01), Nagaura et al.
patent: 4959282 (1990-09-01), Dahn et al.
patent: 5425932 (1995-06-01), Tarascon
J. Phys. Chem. Solids, vol. 7, pp. 351-360, 1958, D.G. Wickham, et al., "Crystallographic and Magnetic Properties of Several Spinels Containing Trivalent JA-1044 Manganese".
Phillips Research Reports Supplements, vol. 3, pp. 20-25, 1964, G. Blasse, "Crystal Chemistry and Some Magnetic Properties of Mixed Metal Oxides With Spinel Structure".

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