Ball-Milled Graphite as an Electrode Material for High Voltage Supercapacitor in Neutral Aqueous Electrolyte
Authors:
- Yaming WangYWYaming Wang
- Jianyun CaoJCJianyun Cao
- Yu ZhouYZYu Zhou
- Jia-Hu OuyangJia-Hu Ouyang
- Dechang JiaDJDechang Jia
- Lixin GuoLGLixin Guo
- 1 January 2012
- journal article
- Published by The Electrochemical Society in Journal of the Electrochemical Society
- Vol. 159 (5) , A579-A583
Abstract
Amorphous carbonaceous material with specific surface area of 422 m2 g−1 has been prepared from natural flake graphite by high-energy ball-milling under air atmosphere. Milling treatment introduces abundant oxygen functional groups (carboxyl and alkoxy) to the graphite surface, and oxygen content reaches as high as 11.5 atom% after 75 h milling. The ball-milled graphite exhibits a three electrode stable potential window of 1.8 V in 1 mol L−1 Na2SO4 aqueous electrolyte. Symmetric supercapacitor based on ball-milled graphite shows a stable charge/discharge cycle behavior when cell voltage is set as high as 1.6 V with a specific capacitance of 81 F g−1. The high utilization ratio (89%) of potential window for this system is attributed to the more negative value of E0V (electrodes potential when the cell voltage is set to 0 V).Keywords
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