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Intertwined Nanosponge Solid-State Polymer Electrolyte for Rollable and Foldable Lithium-Ion Batteries.

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ACS Applied Materials & Interfaces
|February 29, 2020
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Summary

Researchers developed an intertwined nanosponge solid-state polymer electrolyte (INSPE) for flexible lithium-ion batteries (LIBs). This mechanically robust and ionically conductive material enables high-performance, bendable, and foldable energy storage devices.

Keywords:
foldableintertwined nanospongelithium-ion batteryrollablesolid-state polymer electrolyte

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Polymer Science

Background:

  • Solid-state polymer electrolytes are crucial for developing safer and more flexible lithium-ion batteries (LIBs).
  • Existing solid electrolytes often suffer from poor mechanical properties or insufficient ionic conductivity, limiting their application in flexible devices.
  • Achieving both mechanical robustness and high ionic conductivity in a single material remains a significant challenge.

Purpose of the Study:

  • To develop a novel intertwined nanosponge solid-state polymer electrolyte (INSPE) for highly bendable, rollable, and foldable LIBs.
  • To investigate the mechanical reliability and electrochemical performance of the INSPE.
  • To demonstrate the practical application of INSPE in flexible LIBs under severe mechanical deformation.

Main Methods:

  • Fabrication of the INSPE by conjugating intertwined nanosponge (IN) poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-co-HFP) with an ion-conducting polymer electrolyte (PE) comprising poly(ethylene glycol) diacrylate (PEGDA), succinonitrile (SCN), and lithium bis(trifluoromethanesulfonyl)imide (LiTFSI).
  • Characterization of mechanical properties, including tensile strength and elongation.
  • Measurement of ionic conductivity and its stability under various mechanical deformations.
  • Fabrication and testing of flexible LIBs utilizing the INSPE.

Main Results:

  • The INSPE exhibits excellent mechanical properties (tensile strength of 2.1 MPa, elongation of 36.7%) and high ionic conductivity (1.04 × 10⁻³ S·cm⁻¹).
  • The material retains nearly 100% of its ionic conductivity even after significant mechanical deformations.
  • Flexible LIBs incorporating the INSPE demonstrate outstanding energy storage performance, maintaining functionality under bending, rolling, and folding stresses.

Conclusions:

  • The developed INSPE offers a promising solution for creating mechanically stable and highly conductive solid-state electrolytes.
  • The INSPE's unique properties enable the fabrication of high-performance, durable, and flexible LIBs suitable for next-generation portable electronics.
  • This work paves the way for advanced solid-state battery technologies that can withstand rigorous mechanical manipulation.