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Structure and electrochemical properties of ball-milled Co-carbon nanotube composites as negative electrode material of alkaline rechargeable batteries
- Source :
- Journal of Power Sources. 196:5751-5755
- Publication Year :
- 2011
- Publisher :
- Elsevier BV, 2011.
-
Abstract
- A series of cobalt-carbon nanotube (CNT) composites is synthesized by direct ball-milling of Co and CNT powders with different Co/CNT weight ratios. The microstructure, morphology and chemical state of the ball-milled Co-CNT composites are characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS). It is found that metallic Co nanoparticles of 50–100 nm in size are highly dispersed on the inactive CNT matrix after ball-milling. The electrochemical performance of Co-CNT composites as negative electrode material of alkaline rechargeable batteries is investigated by galvanostatic charge–discharge, linear polarization and cyclic voltammetry (CV) techniques. The results show that the Co-CNT composite (weight ratio 5/1, BM 10 h) displays the optimized electrochemical performance, including discharge capacity and cycle stability. The reversible faradaic reaction between Co and Co(OH)2 is dominant for ball-milled Co-CNT composites.
- Subjects :
- Nanotube
Materials science
Renewable Energy, Sustainability and the Environment
Energy Engineering and Power Technology
Nanoparticle
Carbon nanotube
Microstructure
Electrochemistry
law.invention
Chemical state
X-ray photoelectron spectroscopy
law
Electrical and Electronic Engineering
Physical and Theoretical Chemistry
Composite material
Cyclic voltammetry
Subjects
Details
- ISSN :
- 03787753
- Volume :
- 196
- Database :
- OpenAIRE
- Journal :
- Journal of Power Sources
- Accession number :
- edsair.doi...........907cbf370adb18ae70e4938038172048