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An integrated cathode and solid electrolyte via in situ polymerization with significantly reduced interface

Jialiang Yuan1, Ran Dong1, Yuan Li1

  • 1School of Chemical Engineering, Sichuan University, Chengdu, 610065, China. zhenguowu@scu.edu.cn.

Chemical Communications (Cambridge, England)
|November 22, 2021
PubMed
Summary

Researchers developed an integrated cathode and solid electrolyte (ICSE) to reduce interfacial resistance in solid-state batteries. This novel design enhances battery performance and longevity, paving the way for practical applications.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • High interfacial resistance between solid electrolytes and electrodes hinders solid-state battery performance.
  • Developing solid-state batteries with high energy density requires strategies to overcome interfacial challenges.

Purpose of the Study:

  • To propose and demonstrate a novel integrated cathode and solid electrolyte (ICSE) strategy.
  • To eliminate the contact interface between the cathode and solid electrolyte.

Main Methods:

  • Fabrication of a porous polymer film (PVDF-HFP/PVDF) on a LiFePO4 electrode.
  • Infiltration and concentration of curable monomers (PEGDA/PETMP/TFEMA) into the porous membrane.
  • Ultraviolet (UV) curing to form the integrated cathode and solid electrolyte (ICSE).

Main Results:

  • The LiFePO4//ICSE//Li solid battery achieved a high reversible capacity of 153 mA h g⁻¹.
  • A capacity retention of over 140 mA h g⁻¹ was maintained after 150 cycles at 0.1C and 25 °C.
  • The ICSE strategy effectively reduced interfacial resistance.

Conclusions:

  • The developed ICSE strategy successfully integrates the cathode and solid electrolyte, avoiding interfacial issues.
  • This approach significantly enhances the electrochemical performance and cycle stability of solid-state batteries.
  • The ICSE strategy holds promise for the practical advancement of all-solid-state batteries.