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Anchoring an Artificial Solid-Electrolyte Interphase Layer on a 3D Current Collector for High-Performance Lithium

Panlong Li1, Xiaoli Dong1, Chao Li1

  • 1Department of Chemistry and Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Institute of New Energy, iChEM (Collaborative Innovation Center of Chemistry for Energy Materials), Fudan University, Shanghai, 200433, China.

Angewandte Chemie (International Ed. in English)
|January 3, 2019
PubMed
Summary
This summary is machine-generated.

A novel artificial solid-electrolyte interphase (SEI) using garnet-type LLZTO on copper foam effectively suppresses lithium dendrites. This enhances lithium metal battery performance with a long lifespan and high efficiency.

Keywords:
3D copper foamLLZTOlithium anodeslithium plating/strippingsolid-electrolyte interfaces

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • Lithium metal anodes offer high energy density but suffer from dendrite growth and side reactions, limiting their practical application.
  • Developing stable solid-electrolyte interphases (SEIs) is crucial for overcoming these challenges in lithium metal batteries.

Purpose of the Study:

  • To develop a robust artificial SEI on a 3D scaffold for improved lithium plating/stripping performance.
  • To investigate the efficacy of garnet-type Li6.4 La3 Zr1.4 Ta0.6 O12 (LLZTO) anchored on copper foam as an artificial SEI.

Main Methods:

  • Synthesizing an LLZTO-based artificial SEI anchored on a 3D copper foam scaffold via sintering.
  • Investigating the interfacial properties and stability through heat treatment and interdiffusion analysis.
  • Evaluating the electrochemical performance of the modified electrode in lithium plating/stripping tests.

Main Results:

  • The LLZTO layer was effectively fixed on the copper foam through Cu and Ta2 O5 interdiffusion.
  • The 3D structure reduced current density, while the SEI minimized lithium and electrolyte contact.
  • The LLZTO-modified Cu foam demonstrated excellent Li plating/stripping performance: 2400 h lifespan, 20 mA cm-2 rate capability, 8 mA h cm-2 areal capacity over 100 cycles, and >98% efficiency.

Conclusions:

  • The LLZTO-modified copper foam serves as a stable and effective artificial SEI for lithium metal anodes.
  • This strategy significantly enhances the cycling stability, rate capability, and efficiency of lithium metal batteries.
  • The anchoring construction effectively accommodates the volume changes during lithium deposition and stripping.