Stock material or miscellaneous articles – Coated or structually defined flake – particle – cell – strand,... – Rod – strand – filament or fiber
Patent
1996-08-22
1999-02-23
Lewis, Michael
Stock material or miscellaneous articles
Coated or structually defined flake, particle, cell, strand,...
Rod, strand, filament or fiber
4234472, 429218, H01M 458
Patent
active
058741666
ABSTRACT:
A treated mesophase carbon fiber is disclosed having a high density of exposed edges on the fiber surface, and a method of making such a treated fiber. A carbon electrode is also described which is constructed from such treated mesophase carbon fibers. The resulting electrode, formed from such treated flexible carbon fibers, is characterized by a high density of active sites formed from such exposed edges, low corrosion, and good mechanical strength, and may be fabricated into various shapes. The treated mesophase carbon fibers of the invention are formed by first loading the surface of the mesophase carbon fiber with catalytic metal particles to form catalytic etch sites on a hard carbon shell of the fiber. The carbon fiber is then subject to an etch step wherein portions of the hard carbon shell or skin are selectively removed adjacent the catalytic metal particles adhering to the carbon shell. This exposes the underlying radial edges of the graphite-like layers within the carbon shell of the mesophase carbon fiber, which exposed radial edges then act as active sites of a carbon electrode subsequently formed from the treated mesophase carbon fibers.
REFERENCES:
patent: 4562511 (1985-12-01), Nishino et al.
patent: 4702977 (1987-10-01), Hiratsuka et al.
patent: 4980250 (1990-12-01), Takahashi et al.
patent: 5271917 (1993-12-01), Hoffman
patent: 5292408 (1994-03-01), Tanigawa et al.
patent: 5310553 (1994-05-01), Simon et al.
patent: 5472742 (1995-12-01), Lee
Chu, X., et al., "Catalyzed Carbon Gasification Studied by Scanning Tunneling Microscopy and Atomic Force Microscopy", Journal of Catalysis, vol. 140, 1993, pp. 543-556. No month.
Kanno, R., et al., "Carbon Fiber as a Negative Electrode in Lithium Secondary Cells", J. Electrochem. Soc., vol. 139, No. 12, Dec. 1992, pp. 3397-3404.
Takami, Norio, et al., "Rechargeable Lithium-Ion Cells Using Graphitized Mesophase-Pitch-Based Carbon Fiber Anodes", J. Electrochem. Soc., vol. 142, No. 8, Aug. 1995, pp. 2564-2571.
Zaghib, Karim, et al., "Optimization of Electrochemical Properties of Graphite Whisker for Use as Negative Electrode in Lithium Ion Rechargeable Batteries by Control of Whisker Dimensions", The Electrochemical Society Proceedings, vol. 94-28, pp. 121-135. No date.
Chu Xi
Kinoshita Kimio
Hendrickson Stuart L.
Lewis Michael
Martin Paul R.
Regents of the University of California
Taylor John P.
LandOfFree
Treated carbon fibers with improved performance for electrochemi does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Treated carbon fibers with improved performance for electrochemi, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Treated carbon fibers with improved performance for electrochemi will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-304971