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3D Sodiophilic Ti3C2MXene@g-C3N4Hetero-Interphase Raises the Stability of Sodium Metal Anodes

Journal Article


Abstract


  • Owing to several advantages of metallic sodium (Na), such as a relatively high theoretical capacity, low redox potential, wide availability, and low cost, Na metal batteries are being extensively studied, which are expected to play a major role in the fields of electric vehicles and grid-scale energy storage. Although considerable efforts have been devoted to utilizing MXene-based materials for suppressing Na dendrites, achieving a stable cycling of Na metal anodes remains extremely challenging due to, for example, the low Coulombic efficiency (CE) caused by the severe side reactions. Herein, a g-C3N4layer was attached in situ on the Ti3C2MXene surface, inducing a surface state reconstruction and thus forming a stable hetero-interphase with excellent sodiophilicity between the MXene and g-C3N4to inhibit side reactions and guide uniform Na ion flux. The 3D construction can not only lower the local current density to facilitate uniform Na plating/stripping but also mitigate volume change to stabilize the electrolyte/electrode interphase. Thus, the 3D Ti3C2MXene@g-C3N4nanocomposite enables much enhanced average CEs (99.9% at 1 mA h cm-2, 0.5 mA cm-2) in asymmetric half cells, long-term stability (up to 700 h) for symmetric cells, and stable cycling (up to 800 cycles at 2 C), together with outstanding rate capability (up to 20 C), of full cells. The present study demonstrates an approach in developing practically high performance for Na metal anodes.

Publication Date


  • 2022

Citation


  • Bao, C., Wang, J., Wang, B., Sun, J., He, L., Pan, Z., . . . Wang, J. (2022). 3D Sodiophilic Ti3C2MXene@g-C3N4Hetero-Interphase Raises the Stability of Sodium Metal Anodes. ACS Nano, 16(10), 17197-17209. doi:10.1021/acsnano.2c07771

Scopus Eid


  • 2-s2.0-85139982909

Web Of Science Accession Number


Start Page


  • 17197

End Page


  • 17209

Volume


  • 16

Issue


  • 10

Place Of Publication


Abstract


  • Owing to several advantages of metallic sodium (Na), such as a relatively high theoretical capacity, low redox potential, wide availability, and low cost, Na metal batteries are being extensively studied, which are expected to play a major role in the fields of electric vehicles and grid-scale energy storage. Although considerable efforts have been devoted to utilizing MXene-based materials for suppressing Na dendrites, achieving a stable cycling of Na metal anodes remains extremely challenging due to, for example, the low Coulombic efficiency (CE) caused by the severe side reactions. Herein, a g-C3N4layer was attached in situ on the Ti3C2MXene surface, inducing a surface state reconstruction and thus forming a stable hetero-interphase with excellent sodiophilicity between the MXene and g-C3N4to inhibit side reactions and guide uniform Na ion flux. The 3D construction can not only lower the local current density to facilitate uniform Na plating/stripping but also mitigate volume change to stabilize the electrolyte/electrode interphase. Thus, the 3D Ti3C2MXene@g-C3N4nanocomposite enables much enhanced average CEs (99.9% at 1 mA h cm-2, 0.5 mA cm-2) in asymmetric half cells, long-term stability (up to 700 h) for symmetric cells, and stable cycling (up to 800 cycles at 2 C), together with outstanding rate capability (up to 20 C), of full cells. The present study demonstrates an approach in developing practically high performance for Na metal anodes.

Publication Date


  • 2022

Citation


  • Bao, C., Wang, J., Wang, B., Sun, J., He, L., Pan, Z., . . . Wang, J. (2022). 3D Sodiophilic Ti3C2MXene@g-C3N4Hetero-Interphase Raises the Stability of Sodium Metal Anodes. ACS Nano, 16(10), 17197-17209. doi:10.1021/acsnano.2c07771

Scopus Eid


  • 2-s2.0-85139982909

Web Of Science Accession Number


Start Page


  • 17197

End Page


  • 17209

Volume


  • 16

Issue


  • 10

Place Of Publication