Synthesis and characterization of a hierarchically structured three-dimensional conducting scaffold for highly stable Li metal anodes

Ji Young Kim, Guicheng Liu, Minh Xuan Tran, Ryanda Enggar Anugrah Ardhi, Hansung Kim, Joong Kee Lee

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

Herein, the lithiophilicity of Li2O and the capillary action-induced absorption of molten Li are employed to fabricate a hierarchically structured three-dimensional (3D) Li metal electrode comprising Li2O-coated Cu foam (Li2O@Cu foam), the unique structural characteristics of which allow one to suppress Li dendrite formation and confine Li movement within the foam matrix. The lithiophilicity of Li2O@Cu foam is ascribed to the occurrence of in situ interfacial reactions between Li and Cu oxides formed on the surface of Cu foam, and the formation of the Li2O@Li@Cu hierarchical structure is shown to significantly stabilize the interfacial characteristics of the Li metal anode even in harsh electrochemical environments. In addition to being lithiophilic, Li2O@Cu foam allows for homogeneous plating and stripping of Li ions, since the nucleation overpotential of Li2O toward Li ions is low, e.g., the lowest overpotential of 13 mV is observed during Li plating/stripping at 1.0 mA cm-2. At a total capacity of 1.0 mA h cm-2, Li2O@Cu foam exhibits a coulombic efficiency of >99.0% over 150 cycles at 0.5 mA cm-2, whereas a slightly smaller value of ∼97.5% is observed for 100 cycles at 5 mA cm-2.

Original languageEnglish
Pages (from-to)12882-12892
Number of pages11
JournalJournal of Materials Chemistry A
Volume7
Issue number20
DOIs
Publication statusPublished - 2019

Bibliographical note

Funding Information:
This work was supported by research grants of NRF (NRF-2019R1A2B5B03001772) funded by the National Research Foundation under the Ministry of Science and ICT, Republic of Korea. This work is also supported by Korea Institutional Program (2E29592).

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)

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