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Miscible Polyether/Poly(ether-acetal) Electrolyte Blends.

Kevin W Gao1, Whitney S Loo2, Rachel L Snyder3

  • 1Department of Chemical and Biomolecular Engineering, University of California, Berkeley, Berkeley, California 94720, United States; Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States; Joint Center for Energy Storage Research (JCESR), Argonne National Laboratory, Lemont, Illinois 60439, United States.

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|October 12, 2020
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Summary
This summary is machine-generated.

This study demonstrates creating homogeneous polymer electrolytes for batteries by mixing poly(ethylene oxide) (PEO) and poly(1,3,6-trioxocane) (P(2EO-MO)) with lithium salts. Higher salt concentrations surprisingly lead to stable, miscible blends with promising electrochemical properties.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Polymer Science

Background:

  • Modern lithium-ion batteries utilize solvent mixtures, inspiring exploration of polymer blend electrolytes.
  • Polymer electrolytes offer potential advantages over liquid electrolytes in battery applications.
  • Understanding polymer miscibility and salt interactions is crucial for developing effective polymer electrolytes.

Purpose of the Study:

  • To investigate the miscibility and thermodynamic interactions of poly(ethylene oxide) (PEO)/poly(1,3,6-trioxocane) (P(2EO-MO)) blends with lithium bis(trifluoromethanesulfonyl)imide (LiTFSI).
  • To characterize the electrochemical properties of these polymer blend electrolytes.
  • To explore the potential of polymer blends for creating novel and improved polymer electrolytes.

Main Methods:

  • Small-angle neutron scattering (SANS) to determine polymer miscibility and thermodynamic interactions.
  • Electrochemical characterization using symmetric cells to evaluate ionic conductivity and performance.
  • Analysis of Flory-Huggins interaction parameters (χ and χeff) to quantify polymer-polymer and polymer-salt interactions.

Main Results:

  • PEO/P(2EO-MO) blends are homogeneous with attractive interactions (negative χ) in the absence of salt.
  • Addition of small salt amounts induces macrophase separation (positive χeff), while higher concentrations surprisingly lead to miscible blends (negative χeff).
  • Electrochemical properties of the blends are comparable to PEO/LiTFSI electrolytes, indicating P(2EO-MO) behaves similarly to PEO in the presence of salt.

Conclusions:

  • Miscible polymer blend electrolytes can be achieved by carefully controlling polymer composition and salt concentration.
  • The study reveals a critical salt concentration beyond which blends become miscible, enabling enhanced electrolyte properties.
  • This work presents a new strategy for designing advanced polymer electrolytes by combining polymers or synthesizing new ones for blend applications.