Two-Dimensional Phosphorene-Derived Protective Layers on a Lithium Metal Anode for Lithium-Oxygen Batteries

Youngjin Kim, Dongho Koo, Seongmin Ha, Sung Chul Jung, Taeeun Yim, Hanseul Kim, Seung Kyo Oh, Dong Min Kim, Aram Choi, Yongku Kang, Kyoung Han Ryu, Minchul Jang, Young Kyu Han, Seung M. Oh, Kyu Tae Lee

Research output: Contribution to journalArticlepeer-review

119 Scopus citations

Abstract

Lithium-oxygen (Li-O2) batteries are desirable for electric vehicles because of their high energy density. Li dendrite growth and severe electrolyte decomposition on Li metal are, however, challenging issues for the practical application of these batteries. In this connection, an electrochemically active two-dimensional phosphorene-derived lithium phosphide is introduced as a Li metal protective layer, where the nanosized protective layer on Li metal suppresses electrolyte decomposition and Li dendrite growth. This suppression is attributed to thermodynamic properties of the electrochemically active lithium phosphide protective layer. The electrolyte decomposition is suppressed on the protective layer because the redox potential of lithium phosphide layer is higher than that of electrolyte decomposition. Li plating is thermodynamically unfavorable on lithium phosphide layers, which hinders Li dendrite growth during cycling. As a result, the nanosized lithium phosphide protective layer improves the cycle performance of Li symmetric cells and Li-O2 batteries with various electrolytes including lithium bis(trifluoromethanesulfonyl)imide in N,N-dimethylacetamide. A variety of ex situ analyses and theoretical calculations support these behaviors of the phosphorene-derived lithium phosphide protective layer.

Original languageEnglish
Pages (from-to)4419-4430
Number of pages12
JournalACS Nano
Volume12
Issue number5
DOIs
StatePublished - 22 May 2018

Keywords

  • lithium metal
  • lithium phosphide
  • lithium-oxygen batteries
  • phosphorene
  • protective layers

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