In order to apply to the high-power anode materials of lithium ion battery, various cokes samples were prepared by milling, pitch coating, and following heat treatment. The samples were milled and the larger particles were removed by sieving. Two types of raw cokes and four pitch coated cokes treated at different temperatures were tested as the anode materials for lithium ion battery, and their electrical performance was compared with the cokes without pitch coating. Although the anode materials prepared with cokes showed lower charge-discharge capacity than the graphite anode materials, their power capability was superior to that of graphite. The electrochemical performance of various anodes with the pitch coated cokes was demonstrated as a function of preparation conditions.
Artificial graphite generally manufactured by carbonization sintering of shape-body of
Kneaded mixture using granular cokes as filler and pitch as binder, going through pitch
impregnation process if necessary and finally applying graphitization heat treatment. The effect of
thermal oxidation with air or CO2 atmosphere on IG-11 graphite samples was investigated. The
results show a localized oxidation process which progressively reveals the large coke particles with
increasing overall weight loss in air. The surface of graphite was peel off which was not changed
the specific gravity after air oxidation. However, the specific gravity of graphite continuously
decreased by CO2 oxidation. Decreasing of specific gravity in the CO2 oxidation was because that
CO2 gas ingress the surface to interior. The pore shape after the CO2 oxidation showed the longneck
beakers.
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