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In Situ TEM Investigation of Lithium Intercalation in Ti3C2TX MXenes for Energy Storage Applications
Conference proceeding   Open access   Peer reviewed

In Situ TEM Investigation of Lithium Intercalation in Ti3C2TX MXenes for Energy Storage Applications

Sudhajit Misra, Matthew Boebinger, Tyler S Mathis, Michael Naguib, Yury Gogotsi and Raymond Unocic
Microscopy and microanalysis / editor-in-chief, John Mansfield, v 27(S1), pp 2736-2737
01 Aug 2021
DOI: https://doi.org/10.1017/S1431927621009624
url
https://doi.org/10.1017/s1431927621009624View
Published, Version of Record (VoR)Maybe Open Access (Publisher Bronze),  Open
url
https://doi.org/10.1017/S1431927621009624View
Published, Version of Record (VoR) Open

Abstract

MXenes are a new class of two-dimensional (2D) transition metal carbides (nitrides and carbonitrides) that have unique electronic, optical, electrochemical, and mechanical properties [1]. MXenes have high volumetric capacitance, which is attributed to their unique atomic structure and surface functional group chemistry that allows for high electronic and ionic conductivity, important properties for energy storage materials [2]. In addition to fast surface redox reaction pathways, ion intercalation within MXenes layers provides an additional charge storage mechanism [2,3]; thus, it is crucial to fundamentally understand the mechanisms of ion intercalation. Among the family of synthesized MXenes, the most widely studied phase is Ti3C2Tx, where Tx represents the surface functional groups (-F, -OH, and =O). Bulk measurements of Ti3C2TxMXenes show that cation intercalation can lead to changes in the surface chemistry and enhance volumetric capacitance [4]. Additionally, recent density functional theory-based calculations show that lithium uptake in Ti3C2Tx is reduced by four times due to -F and -OH surface terminations [5]. Measurements on bulk MXene electrodes in electrochemical cells have demonstrated the redox reactions and charge storage due to ion intercalation; however, the mechanism of ion intercalation at the nanoscale is still unclear [2].

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