Nanoscale elastic changes in 2D Ti3C2Tx (MXene) pseudocapacitive electrodes

Come, Jeremy; Xie, Yu; Naguib, Michael; Jesse, Stephen; Kalinin, Sergei V.; Gogotsi, Yury; Kent, Paul R.  C.; Balke, Nina

doi:10.1002/aenm.201502290

Nanoscale elastic changes in 2D Ti₃C₂T_x (MXene) pseudocapacitive electrodes

Journal Article · Mon Feb 01 00:00:00 EST 2016 · Advanced Energy Materials

DOI:https://doi.org/10.1002/aenm.201502290· OSTI ID:1240569

Come, Jeremy ^[1]; Xie, Yu ^[1]; Naguib, Michael ^[2]; Jesse, Stephen ^[1]; Kalinin, Sergei V. ^[3]; Gogotsi, Yury ^[4]; Kent, Paul R. C. ^[5]; Balke, Nina ^[1]

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Science
Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge TN 37831 USA
Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, P.O. Box 2008 Oak Ridge TN 37831 USA
Department of Materials Science and Engineering and A.J. Drexel Nanomaterials Institute, Drexel University, Philadelphia PA 19104 USA
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Science; Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Computer Science and Mathematics Division

Designing sustainable electrodes for next generation energy storage devices relies on the understanding of their fundamental properties at the nanoscale, including the comprehension of ions insertion into the electrode and their interactions with the active material. One consequence of ion storage is the change in the electrode volume resulting in mechanical strain and stress that can strongly affect the cycle life. Therefore, it is important to understand the changes of dimensions and mechanical properties occurring during electrochemical reactions. While the characterization of mechanical properties via macroscopic measurements is well documented, in-situ characterization of their evolution has never been achieved at the nanoscale. Two dimensional (2D) carbides, known as MXenes, are promising materials for supercapacitors and various kinds of batteries, and understating the coupling between their mechanical and electrochemical properties is therefore necessary. Here we report on in-situ imaging, combined with density functional theory of the elastic changes, of a 2D titanium carbide (Ti₃C₂T_x) electrode in direction normal to the basal plane during cation intercalation. The results show a strong correlation between the Li+ ions content and the elastic modulus, whereas little effects of K+ ions are observed. Moreover, this strategy enables identifying the preferential intercalation pathways within a single particle.

View Accepted Manuscript (DOE)

Research Organization:: Energy Frontier Research Centers (EFRC) (United States). Fluid Interface Reactions, Structures and Transport Center (FIRST); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

Grant/Contract Number:: AC02-05CH11231; AC05-00OR22725

OSTI ID:: 1240569

Journal Information:: Advanced Energy Materials, Journal Name: Advanced Energy Materials; ISSN 1614-6832

Publisher:: WileyCopyright Statement

Country of Publication:: United States

Language:: English

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Related Subjects

77 NANOSCIENCE AND NANOTECHNOLOGY
MXene
cation intercalation
contact resonance atomic force microscopy
elastic modulus