Compositions – Electrically conductive or emissive compositions – Metal compound containing
Reexamination Certificate
2006-01-03
2006-01-03
Kopec, Mark (Department: 1751)
Compositions
Electrically conductive or emissive compositions
Metal compound containing
C252S519100, C429S224000, C429S231100, C429S206000, C423S599000, C423S641000
Reexamination Certificate
active
06982048
ABSTRACT:
The present invention provides a potassium-doped mixed metal oxide cathode material formed by advantageously alloying MnO2with potassium and lithium to provide a new mixed metal oxide cathode material as the positive electrode in rechargeable lithium and lithium ion electrochemical cells. By alloying MnO2 with potassium and lithium in a LixKyMn2O4compound, the cathode materials of the present invention afford overcharge protection that allows the cathode to be fully reversible. Manganese dioxide doped with potassium was initially examined as a cathode material for rechargeable lithium and lithium-ion batteries in order to provide a new mixed metal oxide cathode material as the positive electrode in rechargeable lithium and lithium ion electrochemical cells. The LixKyMn2O4material is incorporated into an electrochemical cell with either a lithium metal or lithium ion anode and an organic electrolyte. In one embodiment, the cathode of the present invention comprises a compound with the general formula LixKyMn2O4, where y<0.5, x+y<1.0 and the reversible region for x is between 0.0<x<1.0−y to provide the required overcharge protection and a high voltage cutoff on charge. In the preferred embodiment, a cathode comprising Li0.8K0.1Mn2O4is provided. The cathode materials, cathodes, lithium electrochemical device and methods of this invention answer the long-felt need for a reversible cathode for rechargeable lithium batteries without suffering from the shortcomings, limitations and disadvantages of, rigid stoichiometry electronic control and loss of reversibility.
REFERENCES:
patent: 5478674 (1995-12-01), Miyasaka
patent: 5561006 (1996-10-01), Lecerf et al.
patent: 6306542 (2001-10-01), Nakano et al.
patent: 6576215 (2003-06-01), Numata et al.
patent: 6761997 (2004-07-01), Munakata et al.
Atwater Terrill B.
Salkind Alvin J.
Kopec Mark
Tereschuk George B.
The United States of America as represented by the Secretary of
Vijayakumar Kallambella
Zelenka Michael
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