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Introducing Jahn-Teller Distortion in Inorganic Solid-State Electrolytes to Improve Ionic Conductivity.

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Jahn-Teller distortion, typically avoided in batteries, is innovatively used to improve sodium ion transport in solid-state electrolytes by creating glassy phases. This enhances conductivity and battery performance while preventing dendrite formation.

Keywords:
Jahn‐Teller distortiondendriteglassy phasesinorganic solid‐state electrolytessolid‐state sodium batteries

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Solid-State Physics

Background:

  • Jahn-Teller distortion is usually avoided in battery electrodes due to potential damage.
  • Grain boundaries and voids in inorganic solid-state electrolytes (ISEs) hinder sodium ion transport.
  • Solid-state batteries offer safety advantages over traditional lithium-ion batteries but face challenges in ionic conductivity.

Purpose of the Study:

  • To investigate the novel application of Jahn-Teller distortion in inorganic solid-state electrolytes (ISEs) for solid-state batteries.
  • To enhance sodium ion transport by manipulating the microstructure of Na3Zr2Si2PO12 (NZSPM).
  • To address challenges associated with grain boundaries and voids in ISEs.

Main Methods:

  • Introducing Jahn-Teller distortion using high-spin manganese ions (Mn3+) in Na3Zr2Si2PO12 (NZSPM).
  • Forming glassy phases (NZSPM crystal-NZSPM glass (C-G)) within crystalline NZSPM grains.
  • Fabricating and testing solid-state battery cells with the engineered ISE.

Main Results:

  • Jahn-Teller distortion expanded interplanar spacing and created NZSPM glassy phases, enhancing sodium ion transport.
  • The engineered C-G ISE exhibited an ionic conductivity of 0.498 mS cm-1.
  • A Na||C-G||NaNi1/3Fe1/3Mn1/3O2 (NFM) cell demonstrated high performance (>120 mAh g-1 at 0.1 C) without dendrite formation.

Conclusions:

  • Jahn-Teller distortion can be effectively utilized to improve sodium ion conductivity in ISEs by optimizing microstructure.
  • The developed NZSPM crystal-NZSPM glass (C-G) material shows promise for high-performance, safe solid-state batteries.
  • This work provides new insights into controlling material properties for advanced energy storage applications.