Lithiophilic MXene-Guided Lithium Metal Nucleation and Growth Behavior

Son Ha, Daesin Kim, Hyung Kyu Lim, Chong Min Koo, Seon Joon Kim, Young Soo Yun

Research output: Contribution to journalArticlepeer-review

Abstract

The positive effects of a lithiophilic substrate on the electrochemical performance of lithium metal anodes are confirmed in several reports, while the understanding of lithiophilic substrate-guided lithium metal nucleation and growth behavior is still insufficient. In this study, the effect of a lithiophilic surface on lithium metal nucleation and growth behaviors is investigated using a large-area Ti3C2Tx MXene substrate with a large number of oxygen and fluorine dual heteroatoms. The use of the MXene substrate results in a high lithium-ion concentration as well as the formation of uniform solid–electrolyte-interface (SEI) layers on the lithiophilic surface. The solid–solid interface (MXene-SEI layer) significantly affects the surface tension of the deposited lithium metal nuclei as well as the nucleation overpotential, resulting in the formation of uniformly dispersed lithium nanoparticles (≈10–20 nm in diameter) over the entire MXene surface. The primary lithium nanoparticles preferentially coalesce and agglomerate into larger secondary particles while retaining their primary particle shapes. Subsequently, they form close-packed structures, resulting in a dense metal layer composed of particle-by-particle microstructures. This distinctive lithium metal deposition behavior leads to highly reversible cycling performance with high Columbic efficiencies > 99.0% and long cycle lives of over 1000 cycles.

Original languageEnglish
Article number2101261
JournalAdvanced Functional Materials
Volume31
Issue number32
DOIs
Publication statusPublished - 2021 Aug 9

Keywords

  • MXene
  • SEI layer
  • lithiophilic MXene
  • lithium metal batteries
  • metal anodes

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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