The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 03, 2006
Filed:
May. 04, 2004
Terrill B. Atwater, North Plainfield, NJ (US);
Alvin J. Salkind, Princeton, NJ (US);
Terrill B. Atwater, North Plainfield, NJ (US);
Alvin J. Salkind, Princeton, NJ (US);
The United States of America as represented by the Secretary of the Army, Washington, DC (US);
Abstract
The present invention provides a potassium-doped mixed metal oxide cathode material formed by advantageously alloying MnOwith 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 LiKMnOcompound, 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 LiKMnOmaterial 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 LiKMnO, 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 LiKMnOis 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.