Method for the preparation of cathode active material and...

Details Method for the preparation of cathode active material and... Method for the preparation of cathode active material and...

2006-09-05

2006-09-05

Bos, Steven (Department: 1754)

Chemistry of inorganic compounds

Phosphorus or compound thereof

Oxygen containing

C423S179500, C429S221000

Reexamination Certificate

active

07101521

ABSTRACT:
A LiFePO4carbon 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 LixFePO4, 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. Li3PO4, Fe3(PO4)2or its hydrates Fe3(PO4)2.nH2O, where n denotes the number of hydrates, are used as the starting materials for synthesis of LixFePO4. 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.

REFERENCES:
patent: 6528033 (2003-03-01), Barker et al.
patent: 09134725 (1997-05-01), None
patent: WO 97/40541 (1997-10-01), None
patent: WO 98/12768 (1998-03-01), None
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Grant & Hackh's Chemical Dictionary, 5thedition, 1987, no month, p. 578.
Pending U.S. Appl. No. 09/965,273—Method for the Preparation of Cathode Active Material and Method for the Preparation of Non-Aqueous Electrolyte; Inventor(s)—Hosoya, M. et al., filed Sep. 27, 2001.
Pending U.S. Appl. No. 09/961,863—Method for the Preparation of Cathode Active Material and Method for the Preparation of Non-Aqueous Electrolyte; Inventors(s)—Hosoya, M. et al., filed Sep. 24, 2001.

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