Electrochemical Properties of Carbon-Coated NbO2 as a Negative Electrode for Lithium-Ion Batteries

Chang Su Kim; Yong Hoon Cho; Kyoung Soo Park; Soon Ki Jeong; Yang Soo Kim

doi:10.4028/www.scientific.net/KEM.724.87

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HomeKey Engineering MaterialsKey Engineering Materials Vol. 724Electrochemical Properties of Carbon-Coated NbO2...

Electrochemical Properties of Carbon-Coated NbO₂ as a Negative Electrode for Lithium-Ion Batteries

Abstract:

We investigated the electrochemical properties of carbon-coated niobium dioxide (NbO₂) as a negative electrode material for lithium-ion batteries. Carbon-coated NbO₂ powders were synthesized by ball-milling using carbon nanotubes as the carbon source. The carbon-coated NbO₂ samples were of smaller particle size compared to the pristine NbO₂ samples. The carbon layers were coated non-uniformly on the NbO₂ surface. The X-ray diffraction patterns confirmed that the inter-layer distances increased after carbon coating by ball-milling. This lead to decreased charge-transfer resistance, confirmed by electrochemical impedance spectroscopy, allowing electrons and lithium-ions to quickly transfer between the active material and electrolyte. Electrochemical performance, including capacity and initial coulombic efficiency, was therefore improved by carbon coating by ball-milling.

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Periodical:

Key Engineering Materials (Volume 724)

Pages:

87-91

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.724.87

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Online since:

December 2016

Authors:

Chang Su Kim, Yong Hoon Cho, Kyoung Soo Park, Soon Ki Jeong*, Yang Soo Kim

Keywords:

Carbon Coating, Lithium-Ion Battery, NbO₂, Negative Electrode

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