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Stable Lithium Metal Anode Enabled by 3D Soft Host.

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Summary
This summary is machine-generated.

This study introduces a novel melamine sponge@silver nanowires (MS@AgNWs) current collector for lithium metal batteries. This innovation enables uniform lithium deposition, enhancing battery performance and cycle life.

Keywords:
lithium metalsilver nanowiressoft substratestress reliefuniform deposition

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • Lithium (Li) metal anodes are critical for next-generation batteries but face challenges from dendrite growth and volume expansion.
  • These issues limit the practical application and safety of lithium metal batteries.

Purpose of the Study:

  • To develop a novel current collector for stable and reversible lithium metal anode.
  • To address lithium dendrite growth and volume expansion issues in lithium metal batteries.

Main Methods:

  • Fabrication of a melamine sponge@silver nanowires (MS@AgNWs) composite current collector.
  • Integration of lithophilic nanoseeds, 3D current rectification, and a stress-releasing substrate.
  • Electrochemical testing of MS@AgNWs-Li anodes in symmetric and full cells (with LiFePO4 cathode).

Main Results:

  • The MS@AgNWs host facilitated uniform Li deposition by releasing stress.
  • Achieved high Coulombic efficiency (99.1% over 300 cycles) and low overpotentials (10 mV at 1 mA cm⁻²).
  • Demonstrated superior long-term stability (>1000 h in symmetric cells) and excellent performance in full cells (138.2 mAh g⁻¹ at 1C after 400 cycles).

Conclusions:

  • The MS@AgNWs current collector effectively suppresses Li dendrites and volume expansion.
  • This approach significantly enhances the stability and performance of lithium metal anodes.
  • Scalable fabrication offers potential for practical, flexible lithium metal batteries.