Partic. vol. 6 no. 5 pp. 383-388 (October 2008)
doi: 10.1016/j.partic.2008.06.001

Dry modification of electrode materials by roller vibration milling at room temperature

Shengjuan Li, Shulin Wang^*, Bo Xu

wangshul@online.sh.cn

Abstract

For the first time dry roller vibration milling at room temperature was used to prepare active carbon (AC) nano-particles and to modify MnO₂ powder as electrode materials. In 30 min AC was milled to a mean particle size of 30–50 nm with increased crystallinity and higher specific surface area, predominantly mesoporous and with improved pore diameter distribution. Then, AC nano-particles were incorporated with MnO₂ or bismuth-doped MnO₂ nano-particles synthesized by sol–gel methods to prepare nano-composite electrode materials for studying their electrochemical performance. The AC nano-particles combined with 10 wt.% bismuth-doped MnO₂ nano-particles were found to possess excellent electrochemical property with specific capacitance up to 308 F/g and without obvious attenuation with increasing current. Our method seems to open a new way to improve AC based electrode materials used for clean energy such as super capacitors.

Keywords

Active carbon; Roller vibration milling; Electrode materials; Nano-materials; Super-capacitors