(19)

(11)

EP 2 118 949 A2

(12)

(88) Date of publication A3: 04.12.2008 (43) Date of publication: 18.11.2009 Bulletin 2009/47 (21) Application number: 08782740.8 (22) Date of filing: 31.01.2008

(51) International Patent Classification (IPC):  H01M 4/58(2006.01) C01B 25/45(2006.01) H01M 10/44(2006.01) (86) International application number: PCT/US2008/052584 (87) International publication number: WO 2008/109209 (12.09.2008 Gazette 2008/37)

(84) Designated Contracting States: AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MT NL NO PL PT RO SE SI SK TR (30) Priority: 08.02.2007 US 888929 P 08.02.2007 US 672931 (71) Applicant: A123 Systems, Inc. Watertown MA 02472 (US)	(72) Inventors: CHIANG, Yet-ming Framingham, MA 01701 (US) GOZDZ, Antoni, S. Marlborough, MA 01752 (US) PAYNE, Martin, W. Avon, OH 44011 (US) (74) Representative: Barrett, Jennifer Catherine et al Kilburn & Strode LLP 20 Red Lion Street London WC1R 4PJ 20 Red Lion Street London WC1R 4PJ (GB)