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Enhancing Anode-Free Battery Performance with Self-Healing Single-Ion Conducting PAMPS-co-PBA Copolymer Interfaces.

Chia-Huan Chung1, Liang-Ting Wu2, Daniel Muara Sentosa2

  • 1Graduate Institute of Applied Science and Technology, National Taiwan University of Science and Technology, No. 43 Keelung Road, Sec 4, Taipei 10607, Taiwan.

ACS Applied Materials & Interfaces
|March 18, 2025
PubMed
Summary

This study introduces a new polymer interface, poly{(2-acrylamido-2-methylpropanesulfonic acid)-co-(butyl acrylate)} (PAMPS-co-PBA), to improve anode-free lithium metal batteries by preventing dendrite growth and enhancing stability.

Keywords:
Anode-freeArtificial interfaceCopolymerLi-metal batteriesSelf-healingSingle-ion conducting

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Polymer Chemistry

Background:

  • Anode-free batteries offer a promising path for high-energy-density lithium metal batteries.
  • Challenges like uneven lithium plating and low Coulombic efficiency hinder commercialization.
  • Developing robust artificial interfaces is crucial for stable battery operation.

Purpose of the Study:

  • To engineer an artificial interface, poly{(2-acrylamido-2-methylpropanesulfonic acid)-co-(butyl acrylate)} (PAMPS-co-PBA), for anode-free lithium metal batteries.
  • To enhance the cyclic stability, solid electrolyte interphase (SEI) integrity, and lithium-ion conductivity.
  • To investigate the self-healing and dendrite suppression capabilities of the designed interface.

Main Methods:

  • Synthesis and characterization of PAMPS-co-PBA using FTIR and 1H NMR.
  • Evaluation of surface morphology, tensile strength, and Li plating/stripping performance.
  • Analysis of SEI properties using XPS and computational modeling (DFT, AIMD).
  • Testing of anode-free full cells with the developed interface.

Main Results:

  • Successful synthesis and validation of PAMPS-co-PBA.
  • Demonstrated prevention of lithium dendrite formation and achieved >99% Coulombic efficiency.
  • XPS and computational studies confirmed self-healing and single-ion conductivity.
  • Anode-free cells with PAMPS-co-PBA showed 1.6x higher capacity retention over 50 cycles compared to bare copper.

Conclusions:

  • PAMPS-co-PBA effectively enhances the stability and performance of anode-free lithium metal batteries.
  • The interface's self-healing and dendrite suppression properties are key to improved cyclic stability.
  • Further optimization of the lithium salt is suggested for long-term cycling performance.