An in-situ formed bifunctional layer for suppressing Li dendrite growth and stabilizing the solid electrolyte interphase layer of anode free lithium metal batteries

Semaw Kebede Merso, Teshager Mekonnen Tekaligne, Haile Hisho Weldeyohannes, Yosef Nikodimos, Kassie Nigus Shitaw, Shi Kai Jiang, Chen Jui Huang, Zewdu Tadesse Wondimkun, Bikila Alemu Jote, Lennart Wichmann, Gunther Brunklaus, Martin Winter, She Huang Wu, Wei Nien Su, Chung Yuan Mou, Bing Joe Hwang

Research output: Contribution to journalArticlepeer-review

Abstract

Anode-free lithium metal batteries (AFLMBs) can achieve a high energy density. However, achieving high-capacity retention and Coulombic efficiency (CE) are challenging without a continuous Li supply from the Cu anode side. The lower CE and rapid capacity decay in AFLMBs are primarily due to non-uniform Li deposition and electrolyte decomposition during cycling. Herein, strontium fluoride (SrF2) nanoparticles are applied on Cu foils to attain the in-situ forming of a bifunctional interfacial layer, a Li-Sr alloy, and a LiF-rich SEI composite layer during Li plating. The derived Cu@SrF2 electrode has excellent plating/stripping stability and outstanding performance. AFLMB full cell (Cu@SrF2//NCM111) attains an average Coulombic efficiency (ACE) of 98.6 % and capacity retention of 51.0 % at the 60th cycle using a commercial carbonate-based electrolyte. In contrast, the bare AFLMB full cell (BCu//NCM111) only has an ACE of 94.9 % with a capacity retention of 10.2 % under the same conditions. The concept is proven in lithium metal batteries (LMBs). This strategy provides a simultaneous Li nucleation and formation of LiF-rich SEI layers, rendering it promising to realize AFLMBs and LMBs with long lifespans and high CE.

Original languageEnglish
Article number105955
JournalJournal of Energy Storage
Volume56
DOIs
Publication statusPublished - Dec 10 2022
Externally publishedYes

Keywords

  • Anode-free
  • Bifunctional material
  • Li nucleation
  • Li-Sr alloy
  • SrF particles

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

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