Hard Carbon-coated Natural Graphite Electrodes for High-Energy and Power Lithium-Ion Capacitors
- Authors
- Lim, Young-Geun; Park, Jung Woo; Park, Min-Sik; Byun, Dongjin; Yu, Ji-Sang; Jo, Yong Nam; Kim, Young-Jun
- Issue Date
- Jan-2015
- Publisher
- WILEY-V C H VERLAG GMBH
- Keywords
- Lithium-ion capacitor; Negative electrode; Natural graphite; Hard carbon; Surface modification
- Citation
- BULLETIN OF THE KOREAN CHEMICAL SOCIETY, v.36, no.1, pp.150 - 155
- Indexed
- SCIE
SCOPUS
KCI
- Journal Title
- BULLETIN OF THE KOREAN CHEMICAL SOCIETY
- Volume
- 36
- Number
- 1
- Start Page
- 150
- End Page
- 155
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/94695
- DOI
- 10.1002/bkcs.10036
- ISSN
- 0253-2964
- Abstract
- Hard carbon-coated natural graphite materials have been prepared and evaluated as a negative electrode for high-energy and high-power lithium-ion capacitors. The graphite surface was coated with hard carbon by using polyacrylonitrile as a precursor, which was confirmed by X-ray diffraction, Raman spectroscopy, and transmission electron microscopy. The hard carbon coating on natural graphite particles significantly affects the electrochemical characteristics of lithium-ion capacitors. The full-cell using the hard carbon-coated graphite electrode showed much higher energy and power densities than those with pristine natural graphite and hard carbon electrodes, respectively. Furthermore, the hard carbon-coated graphite electrode exhibited an enhanced cycle performance with a capacity retention of 74.6% after 10,000 cycles, higher than those of pristine natural graphite (33.3%) and the mixture of hard carbon and natural graphite (51.4%). The results clearly indicate that the hard carbon-coated graphite electrode is suitable as a negative electrode material for high-energy and high-power lithium-ion capacitors.
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