Pseudocapacitance of MXene nanosheets for high-power sodium-ion hybrid capacitors

Xianfen Wang, Satoshi Kajiyama, Hiroki Iinuma, Eiji Hosono, Shinji Oro, Isamu Moriguchi, Masashi Okubo and Atsuo Yamada ()
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Xianfen Wang: School of Engineering, The University of Tokyo
Satoshi Kajiyama: School of Engineering, The University of Tokyo
Hiroki Iinuma: School of Engineering, The University of Tokyo
Eiji Hosono: National Institute of Advanced Industrial Science and Technology
Shinji Oro: Graduate School of Engineering, Nagasaki University
Isamu Moriguchi: Graduate School of Engineering, Nagasaki University
Masashi Okubo: School of Engineering, The University of Tokyo
Atsuo Yamada: School of Engineering, The University of Tokyo

Nature Communications, 2015, vol. 6, issue 1, 1-6

Abstract: Abstract High-power Na-ion batteries have tremendous potential in various large-scale applications. However, conventional charge storage through ion intercalation or double-layer formation cannot satisfy the requirements of such applications owing to the slow kinetics of ion intercalation and the small capacitance of the double layer. The present work demonstrates that the pseudocapacitance of the nanosheet compound MXene Ti2C achieves a higher specific capacity relative to double-layer capacitor electrodes and a higher rate capability relative to ion intercalation electrodes. By utilizing the pseudocapacitance as a negative electrode, the prototype Na-ion full cell consisting of an alluaudite Na2Fe2(SO4)3 positive electrode and an MXene Ti2C negative electrode operates at a relatively high voltage of 2.4 V and delivers 90 and 40 mAh g−1 at 1.0 and 5.0 A g−1 (based on the weight of the negative electrode), respectively, which are not attainable by conventional electrochemical energy storage systems.

Date: 2015
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DOI: 10.1038/ncomms7544

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