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:
Mar. 02, 2010
Filed:
Apr. 11, 2007
Calin Wurm, Amiens, FR;
Mathieu Morcrette, Amiens, FR;
Sylvain Gwizdala, Brienon sur Armancon, FR;
Christian Masquelier, Amiens, FR;
Calin Wurm, Amiens, FR;
Mathieu Morcrette, Amiens, FR;
Sylvain Gwizdala, Brienon sur Armancon, FR;
Christian Masquelier, Amiens, FR;
Le Centre National de la Rocherche Scientifique, Paris Cedex, FR;
Umicore, Brussels, BE;
Abstract
Methods of manufacture and use of phosphates of transition metals are described as positive electrodes for secondary lithium batteries, including a process for the production of LiMPOwith controlled size and morphology, M being FeCoNiMn, where 0≦x≦1, 0≦y≦1, 0≦w≦1, and x+y+z+w=1. According to an exemplary embodiment, a process is described for the manufacture of LiFePOincluding the steps of providing an equimolar aqueous solution of Li, Feand PO, evaporating water from the solution to produce a solid mixture, decomposing the solid mixture at a temperature of below 500° C. to form a pure homogeneous Li and Fe phosphate precursor, and annealing the precursor at a temperature of less than 800° C. in a reducing atmosphere to produce the LiFePOpowder. The obtained powders can have a particle size of less than 1 μm, and can provide superior electrochemical performance when mixed for an appropriate time with an electrically conductive powder.