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1. (WO2009117871) A METHOD OF PREPARING A LITHIUM IRON PHOSPHATE CATHODE MATERIAL FOR LITHIUM SECONDARY BATTERIES
Latest bibliographic data on file with the International Bureau   

Pub. No.:    WO/2009/117871    International Application No.:    PCT/CN2008/070611
Publication Date: 01.10.2009 International Filing Date: 28.03.2008
IPC:
C01B 25/45 (2006.01), H01M 4/58 (2010.01), H01M 10/36 (2010.01)
Applicants: BYD COMPANY LIMITED [CN/CN]; No. 3001, Hengping Road, Pingshan, Longgang, Shenzhen, Guangdong 518118 (CN) (For All Designated States Except US).
DAI, Quan [CN/CN]; (CN) (For US Only).
SHEN, Julin [CN/CN]; (CN) (For US Only).
XIAO, Feng [CN/CN]; (CN) (For US Only)
Inventors: DAI, Quan; (CN).
SHEN, Julin; (CN).
XIAO, Feng; (CN)
Agent: RUNPING & PARTNERS; Suite 509, Yingu Mansion, No. 9 Beisihuanxilu, Haidian District, Beijing 100190 (CN)
Priority Data:
Title (EN) A METHOD OF PREPARING A LITHIUM IRON PHOSPHATE CATHODE MATERIAL FOR LITHIUM SECONDARY BATTERIES
(FR) PROCÉDÉ D'ÉLABORATION D'UN MATÉRIAU CATHODIQUE À BASE DE LITHIUM, DE FER ET DE PHOSPHATE POUR DES BATTERIES SECONDAIRES AU LITHIUM
Abstract: front page image
(EN)Described is a method of preparing a cathode material for lithium secondary batteries, the method comprising the following steps: sintering a first mixture containing a lithium compound, an iron compound, a phosphorous compound and a carbon additive at a first temperature, to obtain a first sintering product; mixing the first sintering product and a carbon additive, to obtain a second mixture; and sintering the second mixture at a second temperature, to obtain the cathode material. The cathode material so produced exhibits superior electrical properties.
(FR)La présente invention concerne un procédé d'élaboration d'un matériau cathodique pour des batteries secondaires au lithium. Ce procédé comporte plusieurs opérations. On commence par fritter à une première température un premier mélange contenant un composé au lithium, un composé au fer, un composé phosphoreux, et un additif au carbone, ce qui donne un premier produit obtenu par frittage. On prend ensuite le premier produit issu du frittage et on le mélange à une seconde température à un additif au carbone, ce qui donne un second mélange. Enfin, on fritte à une seconde température le second mélange, ce qui donne le matériau cathodique. Le matériau cathodique ainsi obtenu se distingue par ses propriétés électriques supérieures.
Designated States: AE, AG, AL, AM, AO, AT, AU, AZ, BA, BB, BG, BH, BR, BW, BY, BZ, CA, CH, CN, CO, CR, CU, CZ, DE, DK, DM, DO, DZ, EC, EE, EG, ES, FI, GB, GD, GE, GH, GM, GT, HN, HR, HU, ID, IL, IN, IS, JP, KE, KG, KM, KN, KP, KR, KZ, LA, LC, LK, LR, LS, LT, LU, LY, MA, MD, ME, MG, MK, MN, MW, MX, MY, MZ, NA, NG, NI, NO, NZ, OM, PG, PH, PL, PT, RO, RS, RU, SC, SD, SE, SG, SK, SL, SM, SV, SY, TJ, TM, TN, TR, TT, TZ, UA, UG, US, UZ, VC, VN, ZA, ZM, ZW.
African Regional Intellectual Property Organization (BW, GH, GM, KE, LS, MW, MZ, NA, SD, SL, SZ, TZ, UG, ZM, ZW)
Eurasian Patent Organization (AM, AZ, BY, KG, KZ, MD, RU, TJ, TM)
European Patent Office (AT, BE, BG, CH, CY, CZ, DE, DK, EE, ES, FI, FR, GB, GR, HR, HU, IE, IS, IT, LT, LU, LV, MC, MT, NL, NO, PL, PT, RO, SE, SI, SK, 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)