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Enhanced electrochemical p erformance of acicular MnO 2 by adding conductive additive

XINGHUA LIANG1,* , XIAOMING HUA1, YUSI LIU1, SHUAIBO ZENG1, HAIYAN CHEN2

Affiliation

  1. Guangxi Key Laboratory of Automobile Components and Vehicle Technology , Guangxi University of Scie nce and Technology, Liuzhou 545006, Guangxi C hina
  2. School of Materials and Energy , Guangdong University of Technology Guangzhou510000, Guang dong C hina

Abstract

We have demonstrated a type of acicular manganese dioxide (MnO 2 via a facile chemical method. By a dd ing different proportions of acetylene black (AB) or Multi walled carbon nanotubes( MW C NT s in MnO 2 a s conductive additive s , the capacitance of the electrodes with AB and MW CNT s has substantially increased about 30% compared with AB only at 0.25A/g and in the 0.5M Na 2 SO 4 electrolyte. Moreover, the electrode with 15% MW C NT s shows the worst cyclic performance among those three electrode mater i al s, which attribute to the rejection o f the diffu sion of ions in the electrolyte from the intensive conductive netwo rk of MW CNTs. However , the electrode with 5% MW CNT s and 10% AB has a great cycling performance at 78.3% capacitance retention over 1000 cycles. T h e morphology and structure of the MnO 2 / MW CNT s are systematically characterized by scanning electron micros cope (SEM) and X ray diffraction (XRD)..

Keywords

MnO 2 , Multi walled carbon nanotubes S upercapacitor, C onductive additive.

Submitted at: Jan. 12, 2014
Accepted at: July 10, 2014

Citation

XINGHUA LIANG, XIAOMING HUA, YUSI LIU, SHUAIBO ZENG, HAIYAN CHEN, Enhanced electrochemical p erformance of acicular MnO 2 by adding conductive additive, Journal of Optoelectronics and Advanced Materials Vol. 16, Iss. 7-8, pp. 788-791 (2014)