Incorporation of conductive polymer into soft carbon electrodes for lithium ion capacitors

Young Geun Lim, Min Sik Park, Ki Jae Kim, Kyu Sung Jung, Jung Ho Kim, Mohammed Shahabuddin, Dong Jin Byun, Ji Sang Yu

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16 Citations (Scopus)

Abstract

The positive effects of incorporating electrically conductive poly(3,4-ethylenedioxythiophene)-polystyrene sulfonate (PEDOT-PSS) into the negative electrode (NE) of a lithium ion capacitor (LIC) is investigated. The binding material of the NE, styrene-butadiene rubber (SBR), is partially substituted by conductive PEDOT-PSS. The soft carbon NE with 1.0 wt% PEDOT-PSS exhibits enhanced capacity retention of 64% at a current density of 5 C by lowering its electrical and electrochemical charge transfer resistance. The rate capability increased with increasing amounts of PEDOT-PSS, with no variation in the Li<sup>+</sup> diffusivity. This improved electrochemical performance of the NE is also reflected in the LIC full-cell configuration. An LIC employing a 1.0 wt% PEDOT-PSS NE delivers 6.6 F at a high current density of 100 C, which is higher than the 6.0 F measured for the LIC with a bare NE. Moreover, the LIC with the 1.0 wt% PEDOT-PSS NE retains 85% of its initial capacitance even after 5000 cycles. These results are mainly attributed to the favourable electrical network formed by the incorporation of PEDOT-PSS into the NE. Thus, we believe that the incorporation of conductive PEDOT-PSS is a viable approach for obtaining high-power LICs.

Original languageEnglish
Article number21631
Pages (from-to)49-56
Number of pages8
JournalJournal of Power Sources
Volume299
DOIs
Publication statusPublished - 2015 Dec 20

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Keywords

  • Conductive polymer
  • Lithium ion capacitor
  • Negative electrode
  • Soft carbon

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Energy Engineering and Power Technology
  • Renewable Energy, Sustainability and the Environment
  • Physical and Theoretical Chemistry

Cite this

Lim, Y. G., Park, M. S., Kim, K. J., Jung, K. S., Kim, J. H., Shahabuddin, M., Byun, D. J., & Yu, J. S. (2015). Incorporation of conductive polymer into soft carbon electrodes for lithium ion capacitors. Journal of Power Sources, 299, 49-56. [21631]. https://doi.org/10.1016/j.jpowsour.2015.08.083