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Electron Acceptor-Driven Solid Electrolyte Interphases with Elevated LiF Content for 4.7 V Lithium Metal Batteries.

Yongbiao Mu1,2, Zifan Liao1,2, Youqi Chu1,2

  • 1Shenzhen Key Laboratory of Advanced Energy Storage, Department of Mechanical and Energy Engineering, Southern University of Science and Technology, Shenzhen, 518055, People's Republic of China.

Nano-Micro Letters
|February 24, 2025
PubMed
Summary

This study introduces tris(pentafluorophenyl)borane additive to stabilize high-voltage lithium metal batteries (LMBs). The additive enhances dual interfaces, preventing lithium dendrites and improving cathode stability for durable, high-performance energy storage.

Keywords:
Dendrite formationDual interfacesElectron acceptorHigh-voltage cathodesLithium metal batteries

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Energy Storage

Background:

  • High-voltage lithium metal batteries (LMBs) are limited by lithium dendrite growth and cathode instability.
  • Specific challenges arise with high-voltage cathodes like LiNi0.8Mn0.1Co0.1O2 (NCM811).

Purpose of the Study:

  • To develop a strategy for stabilizing high-voltage LMBs.
  • To mitigate lithium dendrite formation and enhance cathode stability using an additive approach.

Main Methods:

  • Introduction of tris(pentafluorophenyl)borane as an electron acceptor additive into the electrolyte.
  • Engineering of dual interfaces on the lithium metal anode and NCM811 cathode.
  • Electrochemical testing of Li||Cu, Li||Li symmetric, Li||NCM811, Li||LNMO, and NCM811||graphite pouch cells.

Main Results:

  • Additive enables ultra-high voltage operation up to 4.7 V.
  • Li||Cu cells show 98.96% coulombic efficiency; Li||Li cells achieve 4000 h cycle life.
  • Li||NCM811 cells retain 87.8% capacity after 100 cycles at 4.7 V.
  • NCM811||graphite pouch cells maintain 93.4% capacity after 1100 cycles at 1 C.

Conclusions:

  • Additive engineering effectively suppresses lithium dendrites and stabilizes high-voltage cathodes.
  • The strategy significantly enhances the durability and performance of lithium metal batteries.
  • This approach paves the way for practical, high-performance, and long-lasting LMBs.