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:
Sep. 05, 2006
Filed:
Sep. 19, 2001
Mamoru Hosoya, Kanagawa, JP;
Kimio Takahashi, Miyagi, JP;
Yuzuru Fukushima, Miyagi, JP;
Sony Corporation, Tokyo, JP;
Abstract
A LiFePOcarbon composite material is to be synthesized in a single phase satisfactorily to prevent the deterioration of the performance of the cathode active material from occurring and achieve superior cell characteristics. In preparing a cathode active material, starting materials for synthesis of a compound represented by the general formula LiFePO, where 0<x≦1, are mixed, milled and a carbon material is added to the resulting mass at an optional time point in the course of mixing, milling and sintering. LiPO, Fe(PO)or its hydrates Fe(PO).nHO, where n denotes the number of hydrates, are used as the starting materials for synthesis of LiFePO. The temperature of a product from said sintering is set to 305° C. or less when said product from said sintering is exposed to atmosphere.