Process for producing a positive electrode for lithium secondary

Details Process for producing a positive electrode for lithium secondary Process for producing a positive electrode for lithium secondary

1994-08-09

1996-03-05

Willis, Jr., Prince

Chemistry: electrical current producing apparatus, product, and

Current producing cell, elements, subcombinations and...

Electrode

H01M 450

Patent

active

054966647

ABSTRACT:
An active material for a positive electrode for lithium secondary batteries and composed of a lithium-manganese oxide (Li.sub.x Mn.sub.2 O.sub.4) with a spinel structure is produced by mixing manganese dioxide with lithium formate (HCOOLi) and/or lithium acetate (CH.sub.3 COOLi), heating the resulting mixture for 10 to 100 hours, preferably at a temperature of from 600.degree. C. to 750.degree. C., and if necessary, grinding the heated mixture. The constituents of the mixture contain manganese and lithium in a molar ratio (Mn:Li) of 2:x, where 0.5<x<1.5. The resulting product has an extremely fine crystallinity and exhibits good cycling stability.

REFERENCES:
patent: 4133856 (1979-01-01), Ikeda et al.
patent: 4788372 (1988-11-01), Gaffney
patent: 4980251 (1990-12-01), Thackeray et al.
patent: 5266299 (1993-11-01), Tarascon

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