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One-Dimensional Porous Li-Confinable Hosts for High-Rate and Stable Li-Metal Batteries.

Dong Woo Kang1, Seong Soo Park2, Hong Jun Choi1

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|June 23, 2022
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Summary

This study introduces a novel porous host material with lithiophilic gold nanoparticles to prevent lithium metal plating issues in batteries. This design enables stable lithium cycling, improving battery performance and longevity.

Keywords:
Li-metal batterycore−shell Li hostelectrospinningfinite element analysisporous shell design

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Nanotechnology

Background:

  • Core-shell hosts are explored for lithium-metal batteries to manage lithium dendrite growth and volume changes.
  • Existing hosts face challenges with surface lithium plating due to hindered ion transport, impacting performance.

Purpose of the Study:

  • To develop a novel 1D porous Li-confinable host with lithiophilic gold (Au@PHCF) to overcome limitations of current hosts.
  • To improve lithium stripping/plating efficiency and achieve stable cycling in lithium-metal batteries.

Main Methods:

  • Synthesis of Au@PHCF using scalable dual-nozzle electrospinning.
  • Electrochemical performance testing of Au@PHCF-Li symmetric cells and LiFePO4 full cells.
  • Finite element analysis to understand the role of structural design and lithiophilicity.

Main Results:

  • Au@PHCF suppresses lithium top plating and enhances Li stripping/plating efficiency, even at high current densities (5 mA cm⁻²).
  • Achieved stable cycling over 1000 cycles for LiFePO4 full cells and 2000 cycles for symmetric cells.
  • Demonstrated fast reversible lithium operation within the host's core space.

Conclusions:

  • The structural design and lithiophilicity of the host are critical for stable lithium-metal battery operation.
  • Au@PHCF offers a promising solution for practical, high-performance lithium-metal batteries.