Mixtures of lithium manganese oxide spinel as cathode active mat

Details Mixtures of lithium manganese oxide spinel as cathode active mat Mixtures of lithium manganese oxide spinel as cathode active mat

1999-03-01

2000-12-12

Weiner, Laura

Chemistry: electrical current producing apparatus, product, and

Current producing cell, elements, subcombinations and...

Electrode

429224, 4292311, 4292313, 4292316, H01M 432

Patent

active

061596361

ABSTRACT:
A method of making lithium manganese oxide of spinel structure is disclosed. The method involves the step of prelithiating a manganese oxide by reacting it with lithium hydroxide or lithium salt and then reacting the prelithiated manganese oxide in a second step at elevated temperature, for example, with lithium carbonate to form a lithium manganese oxide spinel. The spinel product may be used advantageously in secondary (rechargeable) batteries. The spinel product may be admixed with a partially substituted nickelite, preferably, LiNi.sub.x Co.sub.1-x O.sub.2 (0.1<x<0.9) or LiNi.sub.x Mg.sub.1-x O.sub.2 (0.85<x<0.97) and mixtures thereof to form the active material for the positive electrode of a rechargeable lithium ion cell. A preferred mixture for the positive electrode of lithium ion cells comprises lithium manganese oxide spinel and LiNi.sub.x Co.sub.1-x O.sub.2 (0.1<x<0.9). The positive electrode for lithium ion cells may also be formed of a layer comprising active material of lithium manganese oxide spinel overlayed with a second layer comprising active material formed of a partially substituted nickelite, preferably LiNi.sub.x Co.sub.1-x O.sub.2 (0.1<x<0.9) or LiNi.sub.x Mg.sub.1-x O.sub.2 (0.85<x<0.97) and mixtures thereof.

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C. Delmas, I. Saadoune and A. Rougier, "The Cycling Properties of LixNi1-yCoyO2 Electrode", Journal of Power Sources, 43-44 (1993) , pp. 595-602.

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