US 6,982,048 B1 | ||
Potassium stabilized manganese dioxide for lithium rechargeable batteries | ||
Terrill B. Atwater, North Plainfield, N.J. (US); and Alvin J. Salkind, Princeton, N.J. (US) | ||
Assigned to The United States of America as represented by the Secretary of the Army, Washington, D.C. (US) | ||
Filed on May 04, 2004, as Appl. No. 10/843,635. | ||
Application 10/843635 is a division of application No. 09/954294, filed on Sep. 11, 2001, granted, now 6,770,398. | ||
Int. Cl. H01M 4/50 (2006.01); H01M 4/58 (2006.01); C01G 45/12 (2006.01) |
U.S. Cl. 252—518.1 | 19 Claims |
1. A method for making a cathode material for a lithium electrochemical system, comprising the steps of:
drying a manganese oxide and a potassium additive;
forming a first mixture by mixing said manganese oxide and said potassium additive;
forming an intermediate compound by heat-treating said first mixture;
forming a potassium-manganese mixed metal oxide;
heat-treating said potassium-manganese mixed metal oxide;
providing said potassium-manganese mixed metal oxide with the general formula
LixKyMnO2, where y<0.5 and x+y<1.0, and a reversible region where 0.0<x<1.0−y;
said potassium-manganese mixed metal oxide being Li0.375K0.125MnO2;
preventing a phase change in a cathode;
providing an initial specific capacity of about 130 mAhrs/g in said cathode; and
permitting said cathode to be fully reversible.
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