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:
Oct. 15, 2002
Filed:
Apr. 30, 1999
Jun Xu, Minneapolis, MN (US);
Boone B. Owens, Wrightsville Beach, NC (US);
William H. Smyrl, New Brighton, MN (US);
Regents of the University of Minnesota, Minneapolis, MN (US);
Abstract
Amorphous manganese dioxide cathodes for lithium batteries with lithium metal or other lithium-containing anodes, the cathode being synthesized by a sol-gel approach involving reduction of sodium permanganate with fumaric acid disodium salt carried out at room temperature to ensure an amorphous structure. The resulting amorphous manganese dioxide has a nanoporous structure and a high internal surface area of 350 m /g. The amorphous manganese dioxide can electrochemically intercalate more than 1.6 moles of lithium per mole of manganese, and its theoretical capacity is 2 moles of lithium per mole of manganese. The host structure remains amorphous in the entire intercalation range and the intercalation process is reversible. Lithium battery cathodes comprising the amorphous manganese dioxide, a carbon powder and a binder provide a charge capacity in the level of 436 mAh/g and store energy at the level of 1056 mWh/g. Copper doped amorphous manganese oxides showed significant improvement in cycling performance.