Enhanced Li-Ion Accessibility in MXene Titanium Carbide by Steric Chloride Termination

Satoshi Kajiyama, Lucie Szabova, Hiroki Iinuma, Akira Sugahara, Kazuma Gotoh, Keitaro Sodeyama, Yoshitaka Tateyama, Masashi Okubo, Atsuo Yamada

Research output: Contribution to journalArticle

65 Citations (Scopus)

Abstract

Pseudocapacitance is a key charge storage mechanism to advanced electrochemical energy storage devices distinguished by the simultaneous achievement of high capacitance and a high charge/discharge rate by using surface redox chemistries. MXene, a family of layered compounds, is a pseudocapacitor-like electrode material which exhibits charge storage through exceptionally fast ion accessibility to redox sites. Here, the authors demonstrate steric chloride termination in MXene Ti2CTx (Tx: surface termination groups) to open the interlayer space between the individual 2D Ti2CTx units. The open interlayer space significantly enhances Li-ion accessibility, leading to high gravimetric and volumetric capacitances (300 F g−1 and 130 F cm−3) with less diffusion limitation. A Li-ion hybrid capacitor consisting of the Ti2CTx negative electrode and the LiNi1/3Co1/3Mn1/3O2 positive electrode displays an unprecedented specific energy density of 160 W h kg−1 at 220 W kg−1 based on the total weight of positive and negative active materials.

Original languageEnglish
JournalAdvanced Energy Materials
Volume7
Issue number9
DOIs
Publication statusPublished - May 10 2017

Keywords

  • hybrid capacitors
  • intercalation
  • MXene
  • negative electrode
  • pseudocapacitors

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)

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    Kajiyama, S., Szabova, L., Iinuma, H., Sugahara, A., Gotoh, K., Sodeyama, K., Tateyama, Y., Okubo, M., & Yamada, A. (2017). Enhanced Li-Ion Accessibility in MXene Titanium Carbide by Steric Chloride Termination. Advanced Energy Materials, 7(9). https://doi.org/10.1002/aenm.201601873