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:
Aug. 25, 2015
Filed:
Jun. 06, 2011
Jan L. Allen, Silver Spring, MD (US);
T. Richard Jow, Potomac, MD (US);
Jeffrey Wolfenstine, Silver Spring, MD (US);
Jan L. Allen, Silver Spring, MD (US);
T. Richard Jow, Potomac, MD (US);
Jeffrey Wolfenstine, Silver Spring, MD (US);
The United States of America as represented by the Secretary of the Army, Washington, DC (US);
Abstract
A lithiated metal phosphate material substituted by divalent atoms at the M2 site and trivalent atoms, a portion of which are present at both the M2 and the M1 sites. The substituted material has the general formula of LiMTDPO, wherein M is selected from the group consisting of Mn, Co, Niand combinations thereof; T is selected from the group consisting of Fe, Aland Gaand a portion of said T resides at the M2 sites, said portion being greater than 0 and no more than 99 percent of the total T atoms; D is selected from the group consisting of Fe, Mn, Co, Ni, Mg, Zn, Caand combinations thereof; d has a value greater than 0 and no more than 0.3; and t has a value in the range of 0 to 0.3. Also disclosed are electrodes which incorporate the substituted metal phosphate material and are disposed in electrochemical cells as well as batteries, including rechargeable lithium ion batteries. Finally, there is disclosed a method of increasing the life cycle of an electrode by forming the electrode by mixing and dissolving LiHPO, Co(OH)and FeCO.2HO in HNO, evaporating the water from this solution to form a solid powder mixture, heating said mixture to around 600° C. under Nfor approximately 12 hours, cooling, ball milling for about 30 minutes the mixture with 0.01-10 wt. % acetylene black; heating the mixture again to around 600° C. under Nfor about an hour and then coating the mixture onto an Al foil substrate to produce a composite electrode.