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Carbon nanofibers (CNFs) of high graphitization degree were prepared by a CVD process at 550-700 o C. They showed different structures according to catalyst and preparation temperatures. The structure of CNF prepared from CO/H 2 over an iron catalyst was controlled from platelet (P) to tubular (T) by raising the decomposition temperature from 550 to 700 o C. The CNFs prepared...
We report here the preparation of Kevlar-derived carbon fibers and the preliminary results on their anodic performances in Li secondary batteries. The single- or two-step carbonization process is employed for the preparation. In the single-step process, the Kevlar flocks are heat-treated under Ar atmosphere from 25 to 800 o C with a heating rate of 5 o C min -1 , but an...
Electrochemical voltage spectroscopy (EVS) was utilized to compare the graphitization tendency of two needle cokes at 2000 to 3000 o C. Of the two precursors, the NC-A-1000 has a higher density and lower impurity than NC-B-1000. The polarized optical microscopic pictures revealed that the NC-A-1000 has a flow-type texture whereas the NC-B-1000 a mixed (flow and mosaic) one, indicative of a...
The reversible Li + storage sites and storage-de-storage mechanisms are studied with the carbonaceous materials prepared from methylnaphthalene-derived isotropic pitches. Results of the electrochemical studies indicate that these carbons have at least three different Li + storage sites: Li + ions are de-stored from site I at 0.0-0.12 V (vs. Li/Li + ), from site II at...
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