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Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications
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Lithium Borate Polycarbonates for High-Capacity Solid-State Composite Cathodes.

Thomas Charlesworth1, Kanyapat Yiamsawat1, Hui Gao1,2

  • 1Chemistry Research Laboratory, University of Oxford, 12 Mansfield Road, Oxford, OX1 3TA, UK.

Angewandte Chemie (International Ed. in English)
|May 31, 2024
PubMed
Summary
This summary is machine-generated.

New block copolymer binders significantly enhance solid-state battery performance. These binders improve capacity and retention in composite cathodes, paving the way for commercialization.

Keywords:
BatteriesMaterials SciencePolymer ElectrolytesPolymerizationRing-Opening (Co)Polymerization

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Polymer Chemistry

Background:

  • Solid-state batteries require advanced composite cathodes for improved performance.
  • Polymeric binders are crucial for maintaining ionic conductivity and chemo-mechanical stability in composite cathodes.

Purpose of the Study:

  • To develop and evaluate novel block copolymer networks as binders for solid-state battery composite cathodes.
  • To enhance the capacity, capacity retention, and ionic conductivity of composite cathodes.

Main Methods:

  • Synthesis of block copolymer networks comprising lithium borate polycarbonates and poly(ethylene oxide).
  • Fabrication and electrochemical testing of all-solid-state composite cathodes using nickel-rich LiNi0.8Co0.1Mn0.1O2, Li6PS5Cl, and carbon.
  • Characterization of ionic conductivity and Li-ion transference numbers.

Main Results:

  • The block copolymer binders improved cathode capacity to 200 mAh g-1 at 1.75 mA cm-2 and capacity retention to 94% over 300 cycles.
  • The binders exhibited high Li-ion conductivities (0.2 mS cm-1 at 30°C) and Li-ion transference numbers close to unity (tLi+ ~0.94).
  • Tetrahedral anions provided hydrogen-bonding crosslinking and selective Li-ion conductivity.

Conclusions:

  • Block copolymer networks are effective binders for enhancing solid-state battery composite cathode performance.
  • The developed binders offer a promising route for improving the processability and commercial viability of solid-state batteries.
  • These findings can inform future binder designs for various battery configurations, including lithium-sulfur systems.