Pseudocapacitive Characteristics of Low-Carbon Silicon Oxycarbide for Lithium-Ion Capacitors

Martin Halim, Guicheng Liu, Ryanda Enggar Anugrah Ardhi, Chairul Hudaya, Ongky Wijaya, Sang Hyup Lee, A. Young Kim, Joong Kee Lee*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

54 Scopus citations


Lithium-ion capacitors (LICs) and lithium-ion batteries (LIBs) are important energy storage devices. As a material with good mechanical, thermal, and chemical properties, low-carbon silicon oxycarbide (LC-SiOC), a kind of silicone oil-derived SiOC, is of interest as an anode material, and we have examined the electrochemical behavior of LC-SiOC in LIB and LIC devices. We found that the lithium storage mechanism in LC-SiOC, prepared by pyrolysis of phenyl-rich silicon oil, depends on an oxygen-driven rather than a carbon-driven mechanism within our experimental scope. An investigation of the electrochemical performance of LC-SiOC in half- and full-cell LIBs revealed that LC-SiOC might not be suitable for full-cell LIBs because it has a lower capacity (238 mAh g-1) than that of graphite (290 mAh g-1) in a cutoff voltage range of 0-1 V versus Li/Li+, as well as a substantial irreversible capacity. Surprisingly, LC-SiOC acts as a pseudocapacitive material when it is tested in a half-cell configuration within a narrow cutoff voltage range of 0-1 V versus Li/Li+. Further investigation of a "hybrid" supercapacitor, also known as an LIC, in which LC-SiOC is coupled with an activated carbon electrode, demonstrated that a power density of 156 000 W kg-1 could be achieved while maintaining an energy density of 25 Wh kg-1. In addition, the resulting capacitor had an excellent cycle life, holding â90% of its energy density even after 75 000 cycles. Thus, LC-SiOC is a promising active material for LICs in applications such as heavy-duty electric vehicles.

Original languageEnglish (US)
Pages (from-to)20566-20576
Number of pages11
JournalACS Applied Materials and Interfaces
Issue number24
StatePublished - Jun 21 2017

Bibliographical note

Publisher Copyright:
© 2017 American Chemical Society.


  • lithium-ion capacitor
  • low-carbon silicon oxycarbide
  • oxygen-driven mechanism
  • prelithiation
  • pseudocapacitive characteristic
  • silicone oil-derived SiOC

ASJC Scopus subject areas

  • General Materials Science


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