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Enhancing Lithium Stripping Efficiency in Anode-Free Solid-State Batteries through Self-Regulated Internal Pressure.

Daxian Cao1, Tongtai Ji1, Zhengxuan Wei1

  • 1Department of Mechanical and Industrial Engineering, Northeastern University, 360 Huntington Avenue, Boston, Massachusetts 02115, United States.

Nano Letters
|October 11, 2023
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Summary

An innovative elastic carbon felt layer boosts anode-free all-solid-state lithium metal battery performance by maintaining consistent anode contact during lithium stripping, significantly improving initial efficiency and cycle life.

Keywords:
all-solid-state Lithium metal batteriesanode-freeinterface contactpressure regulationstripping efficiency

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • Anode-free all-solid-state lithium metal batteries (ASLMBs) offer high energy density and safety.
  • However, they face challenges with low initial Coulombic efficiency and poor cycle life, particularly at high cathode loadings.
  • These issues are linked to interfacial contact loss during lithium stripping.

Purpose of the Study:

  • To develop a strategy for enhancing the performance and longevity of anode-free ASLMBs.
  • To address the problem of interfacial contact loss during lithium stripping in ASLMBs.
  • To improve the initial Coulombic efficiency and cycling stability of ASLMBs.

Main Methods:

  • Introduction of a conductive carbon felt elastic layer at the anode.
  • Utilizing operando techniques to analyze interfacial behavior.
  • Investigating the self-adjusting pressure and electronic conduction properties of the interlayer.

Main Results:

  • The conductive carbon felt layer ensures consistent lithium-solid electrolyte contact.
  • It effectively releases plating pressure, mitigating interfacial issues.
  • The first Coulombic efficiency increased from 58.4% to 83.7%.
  • Cycling stability showed a >10-fold improvement.

Conclusions:

  • The conductive elastic interlayer is a viable approach to enhance anode-free ASLMB performance.
  • Mitigating lithium stripping inefficiency through self-adjusting interfacial pressure is key to improving battery longevity.
  • This study provides a pathway for developing more stable and efficient ASLMBs.