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Advancing NASICON-structured solid-state sodium-ion batteries through compositional and interfacial engineering.

Raghunayakula Thirupathi1, Ravi P Srivastava1,2, Bhumika Patankar1

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This study enhances NASICON-type solid electrolytes (SEs) for solid-state batteries (SSBs) by optimizing composition and interfaces. This leads to improved ionic conductivity and electrochemical stability for advanced battery applications.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Solid-State Chemistry

Background:

  • NASICON-type ceramics are promising solid electrolytes (SEs) for solid-state batteries (SSBs).
  • Current limitations include moderate ionic conductivity and high interfacial resistance, hindering practical application.
  • Advancements are crucial for next-generation energy storage solutions.

Purpose of the Study:

  • To review recent advancements in overcoming challenges in NASICON-type SEs for SSBs.
  • To present a dual strategy of compositional and interfacial engineering.
  • To provide a framework for rational design and future research directions.

Main Methods:

  • Compositional engineering via co-doping Na3Zr2Si2PO12 (NZSP) with elements like Yb/Sc, Ce/Sc, and Mg/Si to enhance Na+ conductivity.
  • Interfacial engineering techniques including wetting agent insertion, composite cathode formation, and infiltrated cathodes to improve solid-solid contact and electrochemical stability.
  • Integration of these approaches for rational design of NASICON-based SSBs.

Main Results:

  • Co-doping strategies enhance Na+ conductivity through structural modifications in NZSP.
  • Interfacial engineering improves contact between cathode and SE, boosting electrochemical stability.
  • SSBs with Mg/Si co-doped NZSP, Na metal anode, and infiltrated cathode achieved high active mass loading (2.2 mg cm-2) and good cycling performance (103.8 mA h g-1 at 0.2C, 95% retention after 50 cycles).

Conclusions:

  • A unified framework for designing NASICON-based SSBs by combining compositional and interfacial engineering is presented.
  • The study demonstrates significant progress in achieving high-performance SSBs using optimized NASICON electrolytes.
  • A roadmap for future research and development in NASICON-based SSB technology is outlined.