Hard carbon-coated natural graphite electrodes for high-energy and power lithium-ion capacitors

Young Geun Lim, Jung Woo Park, Min Sik Park, Dongjin Byun, Ji Sang Yu, Yong Nam Jo, Young Jun Kim

Research output: Contribution to journalArticle

10 Citations (Scopus)

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 highpower lithium-ion capacitors.

Original languageEnglish
Pages (from-to)150-155
Number of pages6
JournalBulletin of the Korean Chemical Society
Volume36
Issue number1
DOIs
Publication statusPublished - 2015 Jan 20

Keywords

  • Hard carbon
  • Lithium-ion capacitor
  • Natural graphite
  • Negative electrode
  • Surface modification

ASJC Scopus subject areas

  • Chemistry(all)

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