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Dry-Processable Polymer Electrolytes for Solid Manufactured Batteries.

Jiying Yang1, Zhang Cao2, Yuwei Chen1

  • 1Key Laboratory of Rubber-Plastics, Ministry of Education/Shandong Provincial Key Laboratory of Rubber-Plastics, Qingdao University of Science & Technology, Qingdao City 266042, People's Republic of China.

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|October 6, 2023
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Summary
This summary is machine-generated.

A novel solid polymer electrolyte (SPE) using cellulose nanocrystals and polyacrylonitrile offers fast ion transport and mechanical stability for advanced solid-state batteries.

Keywords:
cellulose nanocrystaldry processionic conductivitylithium metal batteryself-assemblysolid polymer electrolyte

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Polymer Science

Background:

  • Solid-state batteries require electrolytes with fast ion transport, good interfacial compatibility, and mechanical strength.
  • Current solid-state electrolytes face challenges in meeting these combined operating requirements.

Purpose of the Study:

  • To develop a novel solid polymer electrolyte (SPE) with a 3D network structure.
  • To enhance ionic conductivity and mechanical stability for solid-state battery applications.

Main Methods:

  • A 3D network SPE was synthesized using in situ graft polymerization of cellulose nanocrystals (CNCs) and polyacrylonitrile (PAN).
  • A dry-processing method was employed, utilizing minimal solvent.
  • The SPE was characterized for ionic conductivity, mechanical properties, and interfacial compatibility.

Main Results:

  • The developed SPE exhibits a 3D network structure with excellent mechanical stability (9.5 MPa tensile strength) and low density (1.2 g cm-3).
  • High ionic conductivity of 3.9 × 10-4 S cm-1 at 18 °C and a high lithium ion migration number (tLi = 0.8) were achieved.
  • Efficient Li+ transport pathways were facilitated by functional groups on CNCs and dipole-dipole interactions between CNCs and PAN.

Conclusions:

  • The combination of hard CNCs and soft PAN in a 3D network provides a promising strategy for high-performance solid polymer electrolytes.
  • The developed SPE demonstrates potential for use in solid-state batteries due to its enhanced ionic conductivity and mechanical properties.
  • A tightly formed interface with LiFePO4 cathodes was achieved, further improving battery performance.