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Polycarbonate-Based Solid-Polymer Electrolytes for Solid-State Sodium Batteries.

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Summary
This summary is machine-generated.

Solid-polymer electrolytes using polypropylene carbonate (PPC) and sodium bis(fluorosulfonyl)imide (NaFSI) show promise for solid-state batteries. Optimizing NaFSI concentration balances conductivity and stability for enhanced cyclability.

Keywords:
electrochemistrylayered oxide cathodesodium metalsodium‐tin anodesolid polymer electrolytesolid‐state battery

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Polymer Science

Background:

  • Solid-state batteries offer enhanced safety and energy density compared to conventional lithium-ion batteries.
  • Developing efficient solid polymer electrolytes (SPEs) is crucial for advancing sodium-ion solid-state battery technology.
  • Polypropylene carbonate (PPC) and sodium bis(fluorosulfonyl)imide (NaFSI) are explored as components for SPEs.

Purpose of the Study:

  • To investigate the ionic conductivity and electrochemical performance of PPC-based solid-polymer electrolytes with varying NaFSI salt concentrations.
  • To fabricate and evaluate solid-state cathode composites using these SPEs for sodium-ion batteries.
  • To optimize the electrolyte composition and cell design for improved cycling stability and capacity retention.

Main Methods:

  • Preparation of solid-polymer electrolytes with different PPC:NaFSI ratios.
  • Fabrication of Na2/3Ni1/3Mn2/3O2 cathode composites via slurry casting.
  • Electrochemical characterization including ionic conductivity measurements, cycling performance tests, linear sweep voltammetry, and online electrochemical mass spectrometry.

Main Results:

  • Ionic conductivity of PPC-NaFSI electrolytes increases with NaFSI concentration, reaching ~1 mS cm-1 at 80 °C for PPC:NaFSI = 0.5:1.
  • The best cycling performance was achieved with a moderate salt concentration (PPC:NaFSI = 5:1), yielding 83 mA h g-1 initial capacity and 80% retention after 150 cycles at 60 °C.
  • Lower salt concentrations exhibited superior electrochemical stability, crucial for long-term battery operation.

Conclusions:

  • Polypropylene carbonate-based solid-polymer electrolytes with NaFSI are viable for sodium-ion solid-state batteries.
  • Balancing ionic conductivity and electrochemical stability is key for optimizing SPE performance.
  • The findings highlight the potential of these materials for developing safer and more efficient solid-state sodium-ion batteries.