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Double Ionic-Electronic Transfer Interface Layers for All-Solid-State Lithium Batteries.

Jingang Zheng1, Chengguo Sun1,2,3, Zhenxing Wang2

  • 1School of Chemical Engineering, University of Science and Technology Liaoning, Anshan, 114051, China.

Angewandte Chemie (International Ed. in English)
|May 21, 2021
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Summary
This summary is machine-generated.

Researchers developed novel interface layers for solid-state lithium batteries, significantly reducing resistance and improving stability. This breakthrough enhances battery performance and longevity for advanced energy storage applications.

Keywords:
lithium-metal batteriesmixed ion-electron interface layerspolymer electrolytessolid electrolyte interphasesolid-state batteries

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Polymer Science

Background:

  • All-solid-state lithium batteries face challenges with high interfacial resistance and poor stability between electrodes and solid electrolytes, hindering Li+ ion migration.
  • Effective interface engineering is crucial for advancing solid-state battery technology and large-scale implementation.

Purpose of the Study:

  • To develop and investigate novel interface layers that mitigate high resistance and improve stability at the electrode-electrolyte interface in all-solid-state lithium batteries.
  • To enhance the compatibility of the interface with Li+ migration and improve overall battery performance.

Main Methods:

  • In-situ polymerization of 2,2'-bithiophene within a polyethylene oxide (PEO) electrolyte to form polythiophene (PT) interface layers.
  • Fabrication and electrochemical testing of all-solid-state LiFePO4 || PT-PEO-PT || Li battery cells.

Main Results:

  • Formation of double ionic-electronic transfer interface layers (PT) at the cathode-electrolyte interface.
  • Achieved a sevenfold decrease in interface resistance.
  • Demonstrated high capacity retention (approx. 94%) after 1000 cycles at 2C rate.
  • Observed lower polarization voltage and superior interface stability with good Li anode compatibility.

Conclusions:

  • The developed polythiophene interface layers effectively reduce interfacial resistance and enhance cycle stability in all-solid-state lithium batteries.
  • This strategy offers a promising approach for overcoming key limitations in solid-state battery technology.
  • The mixed ionic-electronic conductive layers ensure good contact and compatibility, paving the way for practical applications.