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Stabilizing Lithium Metal Anodes by a Self-Healable and Li-Regulating Interlayer.

Ximing Cui1, Ying Chu1, Xiaohui Wang1

  • 1State Key Laboratory of Robotics and Systems, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin 150001, P. R. China.

ACS Applied Materials & Interfaces
|September 10, 2021
PubMed
Summary
This summary is machine-generated.

A novel interlayer of trifluorophenyl-modified poly(ethylene imine) (PEI-3F) effectively suppresses side reactions and dendrite growth in lithium metal anodes. This innovation enhances battery stability and performance for high-energy-density applications.

Keywords:
cycling stabilitydendrite depressionlithium anodelithium regulationself-healable

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Polymer Chemistry

Background:

  • Lithium metal anodes offer high energy density but suffer from interface instability.
  • Side reactions and dendrite growth impede practical application of lithium metal batteries.

Purpose of the Study:

  • To develop a protective interlayer for lithium metal anodes.
  • To address challenges of side reactions and dendrite formation at electrode/electrolyte interfaces.

Main Methods:

  • Synthesized a trifluorophenyl-modified poly(ethylene imine) network (PEI-3F) as an interlayer.
  • Utilized dynamic imine bonding for self-healing properties.
  • Investigated Li+ coordination and distribution adjustment by the interlayer.

Main Results:

  • PEI-3F interlayer demonstrated excellent cycling stability over 250 cycles in asymmetric Li||Cu cells.
  • Dendrite-free lithium metal anode morphology was achieved.
  • A lithium-sulfur cell using the modified anode retained 91% capacity after 100 cycles at high sulfur loading.

Conclusions:

  • The PEI-3F interlayer is a viable strategy to overcome intrinsic drawbacks of lithium metal anodes.
  • This approach offers a novel pathway for developing stable, high-energy-density batteries.
  • The self-healing interlayer concept can be extended to other light-metal electrode systems.