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Reactive Carbide-Based Synthesis and Microstructure of NASICON Sodium Metal All Solid-State Electrolyte.
Callum J Campbell1, Scott Monismith2, Vikalp Raj1
1Materials Science and Engineering Program & Texas Materials Institute (TMI), The University of Texas at Austin, Austin, TX, 78712, USA.
Advanced Materials (Deerfield Beach, Fla.)
|November 5, 2025
Summary
A new method using carbide precursors for synthesizing sodium-ion solid-state electrolytes (SSEs) improves microstructure and suppresses dendrite growth, enhancing battery safety and performance.
Area of Science:
- Materials Science
- Electrochemistry
- Solid-state Chemistry
Background:
- Solid-state electrolytes (SSEs) are crucial for next-generation batteries.
- Traditional NASICON-type NZSP (Na1+xZr2SixP3-xO12) electrolytes are synthesized using oxide-based methods.
- Achieving high density and controlled microstructure in SSEs remains a challenge.
Purpose of the Study:
- To develop a novel carbide precursor-based synthesis route for NASICON-type NZSP SSEs.
- To investigate the microstructural differences between carbide-derived and oxide-derived NZSP.
- To evaluate the impact of microstructure on sodium dendrite suppression and electrochemical performance.
Main Methods:
- Synthesis of NZSP using reactive carbide precursors (ZrC and SiC).
- Conventional sintering at 1200 °C.
- Quantitative stereology and cryogenic focused ion beam (cryo-FIB) for microstructural analysis.
- Electrochemical testing (critical current density) and post-mortem analysis.
- Phase field simulations.
Main Results:
- Carbide-derived NZSP achieved 98% compact density, significantly denser than oxide-derived baseline (93%).
- Carb-NZSP exhibited a lower secondary ZrO2 volume fraction (0.2% vs 3%) and agglomerated glassy phase, unlike the dispersed, percolated phase in baseline material.
- Carb-NZSP showed a higher critical current density (CCD) of 3.1 mA cm-2 compared to 1.0 mA cm-2 for the baseline, indicating improved dendrite suppression.
- Cryo-FIB revealed dendrite propagation patterns around NZSP grains and secondary phases.
- Phase field simulations confirmed that zirconia deflects dendrites, while glassy phase accelerates their growth.
Conclusions:
- Reactive carbide precursor synthesis offers a superior route to dense NZSP SSEs with controlled microstructures.
- Microstructural control, particularly the distribution of secondary phases like glassy phosphate and zirconia, is critical for suppressing sodium dendrite growth.
- The developed Carb-NZSP demonstrates enhanced performance and potential for safer solid-state batteries.
