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:
Nov. 02, 2004
Filed:
Sep. 24, 2001
Sony Corporation, Tokyo, JP;
Abstract
A LiFePO carbon composite material is to be synthesized in a single phase satisfactorily to achieve superior cell characteristics. In preparing a cathode active material, a starting material for synthesis of a compound represented by the general formula Li FePO , where 0<x≦1, is mixed, milled and sintered and a carbon material is added to the resulting mass at an optional time point in the course of mixing, milling and sintering. Li PO , Fe (PO ) or its hydrates Fe (PO ) H O, where n denotes the number of hydrates, are used as the starting material for synthesis of Li FePO . The particle size distribution of particles of the starting material for synthesis following the milling with the particle size not less than 3 &mgr;m is set to 2.2% or less in terms of the volumetric integration frequency.