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A battery is a galvanic cell that is used as a source of electrical power for specific applications. Modern batteries exist in a multitude of forms to accommodate various applications, from tiny button batteries such as those that power wristwatches to the very large batteries used to supply backup energy to municipal power grids. Some batteries are designed for single-use applications and cannot be recharged (primary cells), while others are based on conveniently reversible cell reactions that...
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Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications
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Zwitterionic Cellulose-Based Polymer Electrolyte Enabled by Aqueous Solution Casting for High-Performance Solid-State

Yong Cheng1, Zhichao Cai1, Jinglei Xu1

  • 1State Key Laboratory of Physical Chemistry of Solid Surfaces, College of Materials, Xiamen University, Xiamen, 361005, China.

Angewandte Chemie (International Ed. in English)
|May 7, 2024
PubMed
Summary
This summary is machine-generated.

Zwitterionic cellulose nanofibers enhance polyethylene oxide solid-state electrolytes, improving ionic conductivity and mechanical strength for safer, high-performance batteries.

Keywords:
Li+ ConductivityMechanical StrengthSolid-state BatteriesSolid-state Polymer ElectrolyteZwitterionic Cellulose

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Polymer Science

Background:

  • Polyethylene oxide (PEO)-based solid-state batteries offer high energy and safety.
  • Limitations include low ionic conductivity, poor Li+ transference, and weak mechanical properties.

Purpose of the Study:

  • To address PEO electrolyte limitations by incorporating zwitterionic cellulose nanofibers (ZCNF).
  • To enhance ionic conductivity, Li+ transference, and mechanical strength simultaneously.

Main Methods:

  • Aqueous solution casting method for preparing ZCNF-filled PEO electrolytes.
  • Characterization techniques and theoretical calculations to understand ZCNF's function.
  • Fabrication and testing of LiFePO4|PL-ZCNF|Li solid-state full-cells and pouch-cells.

Main Results:

  • ZCNF disrupts PEO crystallization, aids salt dissociation, and facilitates Li+ transport.
  • Achieved ionic conductivity of 5.37×10-4 S/cm and Li+ transference number of 0.62 at 60°C.
  • Demonstrated high mechanical strength (9.2 MPa) and critical current density (1.1 mA/cm²).
  • Full-cells showed excellent rate capability and cycling stability (900 cycles at 5C).
  • Pouch-cells maintained 93.7% capacity after 1000 cycles at 0.5C and 60°C.

Conclusions:

  • Zwitterionic cellulose nanofibers effectively overcome PEO electrolyte limitations.
  • The developed PL-ZCNF electrolyte shows significant potential for practical solid-state battery applications.
  • Simultaneous improvement in conductivity, transference number, and mechanical properties is achieved.