Aqueous processing of lithium-ion battery cathodes using hydrogen peroxide-treated vapor-grown carbon fibers for improvement of electrochemical properties
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The electrochemical behavior of aqueous processing lithium cobalt oxide (LiCoO2) cathodes used hydrogen peroxide (H2O2)-treated vapor-grown carbon fibers (VGCFs) as a conductive agent for lithium-ion batteries has been investigated and improved. The sedimentation experiments show that the dispersibility in water of H2O2-treated VGCFs is better than that of KS-6 (flaky graphite) or as-received VGCFs. This improvement is due to the surface chemistry of H2O2-treated VGCFs has become more hydrophilic that was evidenced by its significant shift of iso-electric point (I.E.P) from pH 6.7 to 5.0. As a result, the H2O2-treated VGCFs can be well-dispersed in the LiCoO2 electrode which was observed by scanning electron microscope. Furthermore, the rate capability results of electrodes show that addition with H2O2-treated VGCFs has better performance than that with KS-6 or as-received VGCFs.
KeywordsRate Capability Styrene Butadiene Rubber Conductive Agent Lithium Cobalt Oxide LiCoO2 Cathode
Funding for this study was provided by the National Science Council of the Republic of China under Grant No: NSC 95-2221-E-027-034.
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