CNT-CoO Complex Conductive Agent for the Positive Electrodes of MH/Ni Batteries

Abstract:

CoO was usually added to the positive electrodes of MH/Ni batteries as the conductive agent. In this paper, well crystallized multi-walled carbon nanotubes (CNTs) with diameter about 10 nm were added to the positive electrodes of MH/Ni batteries together with CoO. During the process of transformation from CoO to CoOOH, a complex conductive network was created with CNTs as the frame. Because of the high conductivity and the excellent tension characteristics of CNTs, the charge-transfer capability of the electrode was improved and the integrality of the complex conductive network was enhanced. The electrochemical measurements indicated that the impedance of the electrode with CNT-CoO complex conductive agent was lessened compared to the electrode with simple CoO agent. Performance tests of the sealed batteries showed that the positive electrodes with CNT-CoO complex conductive agent exhibited higher discharge voltage, improved capacity, modified discharge stability and prolonged lifespan, especially at high current rates.

• Periodical: Materials Science Forum (Volumes 610-613)
• Pages: 488-491
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.610-613.488
• Online since: January 2009
• Authors: Jian Bo Wu, Yong Feng Yuan, Wei Ping Chen
• Keywords: Carbon Nanotube (CN), Conductive Agent, CoO, High-Rate Performance, MH/Ni Battery

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