Method of treating lithium manganese oxide spinel

Details Method of treating lithium manganese oxide spinel Method of treating lithium manganese oxide spinel

1996-07-12

1998-03-31

Kalafut, Stephen

Chemistry: electrical current producing apparatus, product, and

Current producing cell, elements, subcombinations and...

Electrode

423599, 4271263, 427377, H01M 450

Patent

active

057336857

ABSTRACT:
A method of treating lithium manganese oxide of spinel structure is disclosed. The method involves heating the lithium manganese oxide spinel in an atmosphere of an inert gas which does not react with the spinel. Such gases may be selected advantageously from argon, helium, nitrogen, and carbon dioxide. Preferred nonreacting gases which may be employed for spinel treatment are nitrogen or carbon dioxide. The spinel is advantageously treated with such gases at elevated temperatures. Alternatively, the spinel may be first coated with a hydroxide, preferably lithium, sodium or potassium hydroxide and then heated in an atmosphere of carbon dioxide gas at elevated temperatures. Such treatment of lithium manganese oxide spinel has been determined to improve the performance of the spinel when employed as an electrode in rechargeable cells such as lithium-ion cells.

REFERENCES:
patent: 5135732 (1992-08-01), Barboux
patent: 5449577 (1995-09-01), Dahn
patent: 5601948 (1997-02-01), Binder et al.
D.G. Wickham and W.J. Croft, J. Phys. Chem. Solids, vol. 7, p. 351 (1958)

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