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A hybrid solid electrolyte for solid-state sodium ion batteries with good cycle performance.

Meng Cheng1, Tao Qu1, Jie Zi1

  • 1Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, People's Republic of China.

Nanotechnology
|June 27, 2020
PubMed
Summary
This summary is machine-generated.

A flexible hybrid solid electrolyte (HSE) using PVDF-HFP polymer and NASICON ceramic particles offers high ionic conductivity and stability for sodium-ion batteries. This novel HSE enhances electrochemical performance and provides a design strategy for solid-state batteries.

Keywords:
cycle performancehybrid solid electrolyteinterface stabilityionic conductivitysolid-state sodium ion batteries

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Solid-State Batteries

Background:

  • Developing solid-state electrolytes is crucial for safer and more efficient energy storage.
  • Polymer-ceramic hybrid solid electrolytes (HSEs) offer a promising combination of flexibility and ionic conductivity.
  • Sodium-ion batteries are an attractive alternative to lithium-ion batteries due to the abundance of sodium.

Purpose of the Study:

  • To prepare and characterize a novel poly vinylidene fluoride-hexafluoropropylene (PVDF-HFP) based hybrid solid electrolyte (HSE) incorporating Na3Zr2Si2PO12 (NASICON) ceramic particles.
  • To evaluate the electrochemical performance of the HSE in sodium-ion batteries with a Na3V2(PO4)3/C cathode.
  • To demonstrate the potential of HSE as a flexible and stable electrolyte for solid-state sodium-ion batteries.

Main Methods:

  • Solution casting method for HSE preparation.
  • Sol-gel synthesis for carbon-coated sodium vanadium phosphate (Na3V2(PO4)3/C) cathode.
  • Electrochemical testing, including ionic conductivity measurements and battery cycling performance evaluation.

Main Results:

  • The prepared HSE exhibited good flexibility, high ionic conductivity (2.25 × 10^-3 S cm^-1 at RT), and excellent interface stability.
  • Batteries utilizing the HSE demonstrated superior electrochemical performance compared to those with NASICON ceramic solid electrolytes.
  • The HSE-based batteries delivered a reversible capacity of 98 mAh·g^-1 at 0.2 C with 85% capacity retention after 175 cycles at 0.5 C.

Conclusions:

  • The developed HSE combines flexibility and high ionic conductivity, making it suitable for solid-state sodium-ion batteries.
  • The HSE shows excellent interfacial contact with electrodes, crucial for efficient ion transport.
  • This work provides a viable design strategy for advanced solid-state battery electrolytes.