Electrochemically Lithiated Plasma Carbon as Anode Materials for Li-Ion Capacitors

Electrochemically Lithiated Plasma Carbon as Anode Materials for Li-Ion Capacitors
Issue Date
International Congress on Materials and Renewable Energy (MRE 2013)
B-doped and undoped plasma carbons which have hard carbon properties are prepared by plasma pyrolysis method using acetylene (C2H2) and diborane (B2H6) precursors as carbon and boron sources, respectively. Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) are carried out for the observation of morphologies with and without incorporation of B heteroatom. To measure the physical characteristics of the carbon material, we evaluate x-ray diffraction (XRD), Raman spectroscopy, Brunauer-Emmett-Teller (BET) method, and temperature programmed desorption (TPD). As increasing boron contents, particle size increase from 90 to 250 nm and graphite grains are also formed (002) and (101) orientation. The B-doped plasma carbons are formed around 7 graphitic layers and bulk conductivity improve compared with plasma carbon. Moreover, CO group of carbon surface increase relatively than CO2 group meaning storing the electron from carbonyl, hydroxyl and quinone groups [1, 2]. Although the capacitances at the low rate are almost same, the specific capacitances of B-doped carbon (180 F g-1) are higher than that of undoped plasma carbon (152 F g-1) at a relatively high current density of 5000 mA g-1. Therefore, boron doping helps graphitization of carbon structure as catalyst and serves to improve the bulk conductivity which leads to make rate capability batter at the relatively high current density.
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