Nb2CTxMXene Cathode for High-Capacity Rechargeable Aluminum Batteries with Prolonged Cycle Lifetime

Jiahui Li, Fanshuai Zeng, Jehad K. El-Demellawi, Qicai Lin, Shengkun Xi, Junwei Wu, Jiancheng Tang, Xixiang Zhang, Xingjun Liu*, Shaobo Tu*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

16 Scopus citations

Abstract

Aluminum-ion batteries have garnered significant interest as a potentially safer and cheaper replacement for conventional lithium-ion batteries, offering a shorter charging time and denser storage capacity. Nonetheless, the progress in this field is considerably hampered by the limited availability of suitable cathode materials that can sustain the reversible intercalation of Al3+/[AlCl4]-ions, particularly after long cycles. Herein, we demonstrate that rechargeable Al batteries embedded with two-dimensional (2D) Nb2CTxMXene as a cathode material exhibit excellent capacity and exceptional long cyclic performance. We have successfully improved the initial electrochemical performance of Nb2CTxMXene after being properly delaminated to a single-layered microstructure and subjected to a post-synthesis calcining treatment. Compared to pristine Nb2CTxMXene, the Al battery embedded with the calcined Nb2CTxMXene cathode has, respectively, retained high capacities of 108 and 80 mAh g-1after 500 cycles at current densities of 0.2 and 0.5 A g-1in a wide voltage window (0.1-2.4 V). Noteworthily, the cyclic lifetime of Nb2CTxMXene was extended from ∼300 to >500 times after calcination. We reveal that attaining Nb2CTxnanosheets with a controllable d-spacing has promoted the migration of the [AlCl4]-and Al3+ions in the MXene interlayers, leading to enhanced charge storage. Furthermore, we found out that the formation of niobium oxides and amorphous carbon after calcination probably benefits the electrochemical performance of Nb2CTxMXene electrode in Al batteries.

Original languageEnglish (US)
Pages (from-to)45254-45262
Number of pages9
JournalACS Applied Materials and Interfaces
Volume14
Issue number40
DOIs
StatePublished - Oct 12 2022

Bibliographical note

Publisher Copyright:
© 2022 American Chemical Society. All rights reserved.

Keywords

  • 2D MXene
  • aluminum-ion battery
  • calcination
  • cathode materials
  • intercalation

ASJC Scopus subject areas

  • General Materials Science

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