Issue 9, 2020

Fe2CS2 MXene: a promising electrode for Al-ion batteries

Abstract

Aluminum-ion batteries are one of the most promising candidates for next-generation rechargeable batteries. However, the strong electrostatic interactions between highly ionic Al3+ and the electrode hinder the reversible intercalation and fast transport of Al ions. This study suggests a design strategy for a MXene electrode for realizing high-performance Al-ion batteries. Instead of early transition metals and oxygen, the metal M and surface termination T of general MXene (Mn+1XnTx), the use of late transition metals and sulfur can dramatically improve the capacity and rate capability, respectively. The capacity increases 2.2-fold, from 288 mA h g−1 (Ti2CO2) to 642 mA h g−1 (Fe2CS2), and the Al-ion diffusivity increases 104-fold, from 2.8 × 10−16 cm2 s−1 (Ti2CO2) to 6.0 × 10−12 cm2 s−1 (Fe2CS2). This remarkable performance enhancement is due to the charge redistribution in the M and T layers by the late transition metals and the shallowing of the potential energy surface for Al-ion intercalation by sulfur.

Graphical abstract: Fe2CS2 MXene: a promising electrode for Al-ion batteries

Supplementary files

Article information

Article type
Communication
Submitted
17 10 2019
Accepted
07 1 2020
First published
21 2 2020

Nanoscale, 2020,12, 5324-5331

Fe2CS2 MXene: a promising electrode for Al-ion batteries

S. Lee, S. C. Jung and Y. Han, Nanoscale, 2020, 12, 5324 DOI: 10.1039/C9NR08906C

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