2007 NSTI Nanotechnology Conference and Trade Show - Nanotech 2007 - 10th Annual

Applications of Chemically Modified Carbon Nanofibers on the Development of High-powered and Water-based Lithium-ion Batteries

C.C. Li, J.T. Lee, Y.J. Chu and Y.L. Tung
National Taipei University of Technology, TW

Keywords:
carbon nanofibers, lithium-ion battery, cathode

Abstract:
Carbon nanofibers (CNFs) have attracted great interest in the applications of lithium-ion battery due to their unique structure and superior physical properties. However, most as-received CNFs are olephilic and only appropriate for use in the organic-based cathode processes. For environmental and cost considerations, the water-based system has attracted much attention. To improve the electrochemical properties of aqueous processed cathodes, the CNFs are suggested as replacements for flaky graphite such as KS-6. However, the aggregation of CNFs is significant in aqueous suspensions because the olephilic fibers are difficult to wet and disperse in water. Therefore, to obtain a well-dispersed slurry in order to prepare a reliable high quality electrode, surface treatment of CNFs is required. In this investigation, the efficiencies of KS-6, unmodified CNFs and H2O2-modified CNFs on improving the electrochemical properties of lithium cobalt oxide (LiCoO2) cathodes were compared. Results of sedimentation, zeta-potentials, X-ray photon spectroscopy (XPS), scanning electron microscopy (SEM) and electrochemical evaluations show that only the H2O2-modified CNFs can be well dispersed and give the best electronic conductivity and rate capability of electrodes.

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