https://scholars.lib.ntu.edu.tw/handle/123456789/75863
標題: | Graphitization of unburned carbon from oil-fired fly ash applied for anode materials of high power lithium ion batteries | 作者: | Yeh, Tzoo-Shing Wu, Yu-Shiang Lee, Yuan-Haun |
關鍵字: | Anode materials; Electrochemical characterization; Lithium-ion batteries; Unburned carbon | 公開日期: | 2011 | 起(迄)頁: | 309-315 | 來源出版物: | Materials Chemistry and Physics | 摘要: | Unburned carbon is an industrial waste product of oil-fired fly ash. From the viewpoint of waste recycling, using ground unburned carbon with an average size of 6 μm heat treatment at 2700 °C, and both charge and discharge at 0.1 C, yields the first columbic efficiency of about 93.6%. Moreover, after 50 cycles, the discharge capacity is 325.5 mAh g-1, and the capacity retention is about 97.5%. The two conditions tested for rate capability are as follows: First, a charge at 0.2 C rate and discharge at variable C-rates in which the unburned carbon after heat treatment at higher temperature exhibits a higher capacity in the 0.2-3 C region. However, unburned carbon with heat treatment at 2300 °C is a suitable material for the higher C-rate region (5-10 C). Second, for both charge and discharge at the same C-rate, the unburned carbon after heat treatment at higher temperature exhibits a higher capacity in the 0.2-0.5 C region; however, unburned carbon without graphitization treatment is a suitable material for the higher C-rate region (3-10 C). Based on TEM observations, the graphitization treatment samples had annular microstructure which has many active sites, improving the intercalation/deintercalation of lithium ions. Therefore, these results show that compared to natural graphite, graphitization of unburned carbon is more suitable for the anode materials of a high power battery. © 2011 Elsevier B.V. All rights reserved. |
URI: | http://ntur.lib.ntu.edu.tw//handle/246246/243679 | DOI: | 10.1016/j.matchemphys.2011.06.045 | SDG/關鍵字: | Active site; After-heat treatment; Anode material; Average size; Capacity retention; Charge and discharge; Columbic efficiency; Discharge capacities; Electrochemical characterization; High power battery; High-power; Higher temperatures; Intercalation/deintercalation; Lithium ions; Lithium-ion battery; Natural graphite; Rate capabilities; TEM observations; Unburned carbons; Waste recycling; Anodes; Ashes; Characterization; Electric batteries; Energy conversion; Fly ash; Graphitization; Heat treatment; Ions; Lead acid batteries; Lithium; Lithium alloys; Lithium batteries; Lithium compounds; Graphite |
顯示於: | 材料科學與工程學系 |
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