Title:
CARBON-COATED LI-CONTAINING POWDERS AND PROCESS FOR PRODUCTION THEREOF
Document Type and Number:
WIPO Patent Application WO2004001881
Kind Code:
A3
Abstract:
The invention provides a new route for the synthesis of carbon-coated powders having the olivine or NASICON structure, which form promising classes of active products for the manufacture of rechargeable lithium batteries. Carbon-coating of the powder particles is necessary to achieve good performances because of the rather poor electronic conductivity of said structures. For the preparation of coated LiFePO4, sources of Li, Fe and phosphate are dissolved in an aqueous solution together with a polycarboxylic acid and a polyhydric alcohol. Upon water evaporation, polyesterification occurs while a mixed precipitate is formed containing Li, Fe and phosphate. The resin-encapsulated mixture is then heat treated at 700° C. in a reducing atmosphere. This results in the production of a fine powder consisting of an olivine LiFePO4, phase, coated with conductive carbon. When this powder is used as active material in a lithium insertion-type electrode, fast charge and discharge rates are obtained at room temperature and an excellent capacity retention is observed.
Inventors:
AUDEMER ALBANE (BE)
WURM CALIN (FR)
MORCRETTE MATHIEU (FR)
GWIZDALA SYLVAIN (FR)
MASQUELIER CHRISTIAN (FR)
WURM CALIN (FR)
MORCRETTE MATHIEU (FR)
GWIZDALA SYLVAIN (FR)
MASQUELIER CHRISTIAN (FR)
Application Number:
PCT/EP2003/006628
Publication Date:
December 29, 2004
Filing Date:
June 19, 2003
Export Citation:
Assignee:
UMICORE NV (BE)
CENTRE NAT RECH SCIENT (FR)
AUDEMER ALBANE (BE)
WURM CALIN (FR)
MORCRETTE MATHIEU (FR)
GWIZDALA SYLVAIN (FR)
MASQUELIER CHRISTIAN (FR)
CENTRE NAT RECH SCIENT (FR)
AUDEMER ALBANE (BE)
WURM CALIN (FR)
MORCRETTE MATHIEU (FR)
GWIZDALA SYLVAIN (FR)
MASQUELIER CHRISTIAN (FR)
International Classes:
C01B25/30; C01B25/37; C09C3/10; H01M4/131; H01M4/1391; C01B25/45; H01M4/36; H01M4/58; H01M4/62; H01M6/18; H01M10/052; H01M10/36; (IPC1-7): H01M4/58; C09C3/10; C01B25/30; H01M4/62; H01M4/36
Domestic Patent References:
| WO2002027823A1 | 2002-04-04 |
Foreign References:
| EP1184920A2 | 2002-03-06 | |||
| CA2320661A1 | 2002-03-26 | |||
| CA2270771A1 | 2000-10-30 | |||
| EP1193787A2 | 2002-04-03 | |||
| US5910382A | 1999-06-08 | |||
| EP1261050A1 | 2002-11-27 |
Other References:
HUANG H ET AL: "APPROACHING THEORETICAL CAPACITY OF LIFEPO4 THE ROOM TEMPERATURE AT HIGH RATES", ELECTROCHEMICAL AND SOLID-STATE LETTERS, IEEE SERVICE CENTER, PISCATAWAY, NJ, US, vol. 4, no. 10, October 2001 (2001-10-01), pages A170 - A172, XP001100987, ISSN: 1099-0062
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