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1. (WO2002029920) ELECTROLYTE FOR A SECONDARY CELL
Latest bibliographic data on file with the International Bureau   

Pub. No.:    WO/2002/029920    International Application No.:    PCT/GB2001/004183
Publication Date: 11.04.2002 International Filing Date: 20.09.2001
Chapter 2 Demand Filed:    01.02.2002    
IPC:
H01M 10/36 (2010.01), H01M 4/58 (2010.01), H01M 6/16 (2006.01)
Applicants: AEA TECHNOLOGY BATTERY SYSTEMS LTD [GB/GB]; 329 Harwell, Didcot, Oxfordshire OX11 0QJ (GB) (For All Designated States Except US).
COOWAR, Fazlil [FR/US]; (US) (For US Only)
Inventors: COOWAR, Fazlil; (US)
Agent: MANSFIELD, Peter, Turquand; c/o Accentus plc, Patents Department, 329 Harwell, Didcot, Oxfordshire OX11 0QJ (GB)
Priority Data:
0024347.7 05.10.2000 GB
Title (EN) ELECTROLYTE FOR A SECONDARY CELL
(FR) ELECTROLYTE POUR PILE SECONDAIRE
Abstract: front page image
(EN)A reversible lithium ion cell has a graphitic material as the anode material, and the electrolyte includes propylene carbonate and also a chlorinated diethyl carbonate, and a lithium salt, the concentration by weight of the chlorinated diethyl carbonate being less than 2 %. The chlorinated diethyl carbonate appears to form a passivating layer on the surface of the graphite that prevents interaction of propylene carbonate with graphite, but does not impede reversible intercalation of lithium ions. Such cells may be used over a wide temperature range, and have good capacity.
(FR)L'invention concerne une pile réversible à ion lithium dont l'anode est en matériau graphite, l'électrolyte comprenant du carbonate de propylène un diéthylcarbonate chloré, et un sel de lithium, la concentration en poids du diéthylcarbonate chloré étant inférieure à 2 %. Il apparaît que le diéthylcarbonate chloré forme une couche de passivation sur la surface du graphite qui empêche l'interaction du carbonate de propylène et du graphite, mais ne permet pas d'empêcher une intercalation réversible des ions lithium. On peut utiliser de telles piles dans un grand domaine de températures, et ces piles possèdent une bonne capacité.
Designated States: AE, AG, AL, AM, AT, AU, AZ, BA, BB, BG, BR, BY, BZ, CA, CH, CN, CO, CR, CU, CZ, DE, DK, DM, DZ, EE, ES, FI, GB, GD, GE, GH, GM, HR, HU, ID, IL, IN, IS, JP, KE, KG, KP, KR, KZ, LC, LK, LR, LS, LT, LU, LV, MA, MD, MG, MK, MN, MW, MX, MZ, NO, NZ, PL, PT, RO, RU, SD, SE, SG, SI, SK, SL, TJ, TM, TR, TT, TZ, UA, UG, US, UZ, VN, YU, ZA, ZW.
African Regional Intellectual Property Organization (GH, GM, KE, LS, MW, MZ, SD, SL, SZ, TZ, UG, ZW)
Eurasian Patent Organization (AM, AZ, BY, KG, KZ, MD, RU, TJ, TM)
European Patent Office (AT, BE, CH, CY, DE, DK, ES, FI, FR, GB, GR, IE, IT, LU, MC, NL, PT, SE, TR)
African Intellectual Property Organization (BF, BJ, CF, CG, CI, CM, GA, GN, GQ, GW, ML, MR, NE, SN, TD, TG).
Publication Language: English (EN)
Filing Language: English (EN)