Chemistry of inorganic compounds – Oxygen or compound thereof – Metal containing
Reexamination Certificate
2002-07-31
2010-10-19
Bos, Steven (Department: 1793)
Chemistry of inorganic compounds
Oxygen or compound thereof
Metal containing
C423S593100, C423S594400, C423S594600, C423S596000, C429S218100, C429S221000, C429S222000, C429S223000, C429S224000, C429S231900, C429S231950
Reexamination Certificate
active
07815888
ABSTRACT:
Disclosed is a process for producing a secondary battery cathode material by calcining raw materials. The process is characterized by calcining the raw materials together with one or more substances, which are selected from the group consisting of hydrogen, water and water vapor, and conductive carbon and/or a substance, which can form conductive carbon by pyrolysis, added thereto. As crystals of the secondary battery cathode material obtained by this process have been controlled fine sizes, the secondary battery cathode material promotes movements of ions of an alkali metal led by lithium between the interiors of grains of the cathode material and an electrolyte to suppress polarization in an electrode reaction, and further, increases an area of contact between the positive material and a conductivity-imparting material to provide improved conductivity so that improvements are assured in voltage efficiency and specific battery capacity.
REFERENCES:
patent: 5141687 (1992-08-01), Haar et al.
patent: 5942204 (1999-08-01), Dunmead et al.
patent: 6051173 (2000-04-01), Fasano et al.
patent: 6528033 (2003-03-01), Barker et al.
patent: 6730281 (2004-05-01), Barker et al.
patent: 7491468 (2009-02-01), Okada et al.
patent: 2002/0015894 (2002-02-01), Wariishi et al.
patent: 2002/0039275 (2002-04-01), Takeuchi et al.
patent: 2002/0195591 (2002-12-01), Ravet et al.
patent: 2307119 (2000-10-01), None
patent: 2334386 (2000-10-01), None
patent: 0662727 (1995-07-01), None
patent: 1049182 (2000-11-01), None
patent: 1325525 (2003-07-01), None
patent: 1325526 (2003-07-01), None
patent: 1379468 (2004-01-01), None
patent: 52-20395 (1977-02-01), None
patent: 63-58763 (1988-03-01), None
patent: 07-254412 (1995-10-01), None
patent: 09-293509 (1997-11-01), None
patent: 09-293510 (1997-11-01), None
patent: 11-67212 (1999-03-01), None
patent: 2000-340232 (2000-12-01), None
patent: 2001-15111 (2001-01-01), None
patent: 2002-75364 (2002-03-01), None
patent: 2002-110163 (2002-04-01), None
patent: 2002-110165 (2002-04-01), None
patent: 2002-117848 (2002-04-01), None
patent: 2004-509058 (2004-03-01), None
patent: WO-00/60679 (2000-10-01), None
patent: WO-02/27824 (2002-04-01), None
Checked Internation Search Report.
“Characterization of LiFePo4 as the cathode material for rechargeable lithium batteries” by Masayo Takahashi et al., NTT Telecommunications Energy Laboratories, pp. 349-345, Jul. 2001.
Chen, et al. “Carbon in LifePO4/C Composite Electrodes to Maximize Specific Energy, Volumetric Energy, and Tap Density” Hournel of the Electrochemical Society, (2002), 149; A1184-A1189.
Hatta Naoki
Okada Shigeto
Yamaki Jun-Ichi
Bos Steven
Leason Ellis LLP
Mitsui Engineering & Shipbuilding Co. Ltd.
Okada Shigeto
Wartalowicz Paul A
LandOfFree
Method of producing secondary battery cathode material, and... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method of producing secondary battery cathode material, and..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method of producing secondary battery cathode material, and... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-4161176