標題: Carbon nanobeads as an anode material on high rate capability lithium ion batteries
作者: Chang, Jian-Chia
Tzeng, Yu-Fen
Chen, Jin-Ming
Chiu, Hsin-Tien
Lee, Chi-Young
應用化學系
Department of Applied Chemistry
關鍵字: Rechargeable lithium battery;Carbonaceous anode;High rate capability
公開日期: 30-十一月-2009
摘要: Carbon nanobeads (CNBs) were prepared by reacting cyclohexachlorobenzene with dispersed sodium metal at 200 degrees C for 4 h. The CNBs prepared in this manner formed uniform nanobeads, with sizes ranging from 100 to 300 nm. Heating resulted in a reduction in the size of the CNBs, and improvements in their degree of crystallinity. The nanosized carbon materials considerably increased the surface area of the powder, reducing the distance of the intercalation/deintercalation pathway, substantially improving the charge capacity of the lithium ion battery at a high charging rate. The charge capacity of CNBs was found to be 238 mAh g(-1), while that of commercial MCMB reached only 36 mAh g(-1), when the charging rate was 1C (372 mAh g(-1)). As the charging rate was further increased to 2C (744 mAh g(-1)) and 3C (1116 mAh g(-1)), the charge capacities of CNBs dropped to 173 and 111 mAh g(-1), respectively. The cyclic performance of the CNBs was measured and found to be significantly improved in comparison to other carbonaceous materials, for up to 100 cycles. Although cyclic performance did result in a gradual reduction in capacity, the CNBs still greatly exceeded the capacity of MCMB. These results clearly demonstrate the potential role of CNBs as anodes for high capacity Li ion batteries for use in the automobile industry. (C) 2009 Elsevier Ltd. All rights reserved.
URI: http://dx.doi.org/10.1016/j.electacta.2009.07.020
http://hdl.handle.net/11536/6405
ISSN: 0013-4686
DOI: 10.1016/j.electacta.2009.07.020
期刊: ELECTROCHIMICA ACTA
Volume: 54
Issue: 27
起始頁: 7066
結束頁: 7070
顯示於類別:期刊論文


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  1. 000272547200040.pdf