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:
Feb. 04, 2014
Filed:
Mar. 19, 2008
Pierre Gibot, Amiens, FR;
Christian Masquelier, Boves, FR;
Jean-marie Tarascon, Mennecy, FR;
Stephane Levasseur, Brussels, BE;
Philippe Carlach, Antwerp, BE;
Pierre Gibot, Amiens, FR;
Christian Masquelier, Boves, FR;
Jean-Marie Tarascon, Mennecy, FR;
Stephane Levasseur, Brussels, BE;
Philippe Carlach, Antwerp, BE;
Umicore, Brussels, BE;
Centre National de la Recherche Scientifique, Paris-Cedex, FR;
Abstract
The invention relates to active materials for the manufacture of Li-based batteries. A crystalline nanometric powdered material with formula Li(M, M')PO, in particular LiFePO(O≦x≦1), is disclosed, exhibiting single phase Li insertion/extraction mechanism at room temperature when used as positive electrode material in Li-based batteries. Compared to current LiFePO, the novel material results in smooth, sloping charge/discharge voltage curve greatly simplifying the monitoring of the state of charge of the batteries. The coexistence of mixed valence states for Fe (i.e. FeVFe) is believed to increase the electronic conductivity in the room temperature single phase LiFePOmaterial, compared to state of the art two-phase materials. This, together with the nanometric size of the particles and their sharp monomodal size distribution, contributes to the exceptional high-rate capability demonstrated in batteries.