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Active Control of Interface Dynamics in NASICON-Based Rechargeable Solid-State Sodium Batteries.

Zheng Sun1, Lei Li2, Chen Sun1

  • 1Beijing Key Laboratory of Construction Tailorable Advanced Functional Materials and Green Applications, School of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, P. R. China.

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Summary

This study introduces an interface dynamic control (IDC) strategy for NASICON-based solid-state sodium batteries. The strategy enhances stability and suppresses sodium dendrite growth, enabling high performance in all-solid-state sodium metal batteries.

Keywords:
All-solid-stateDendrite growthInterface DynamicsNASICON electrolyteSodium metal batteries

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • Solid-state batteries face challenges like dendrite growth and poor electrolyte-electrode compatibility.
  • NASICON-structured electrolytes are promising for solid-state sodium batteries but require interface optimization.

Purpose of the Study:

  • To develop an interface dynamic control (IDC) strategy for stable NASICON-based solid-state sodium batteries.
  • To improve the ionic conductivity and interfacial properties of Na3Zr2Si2PO12 solid electrolytes.

Main Methods:

  • Incorporation of CuO as an intergranular phase to enhance Na3Zr2Si2PO12 densification and ionic conductivity.
  • Formation of a Na-Cu-O interlayer to improve interfacial properties and suppress sodium dendrite growth.
  • Fabrication and testing of all-solid-state sodium metal batteries with a modified NASICON electrolyte and Na3V1.5Cr0.5(PO4)3 cathode.

Main Results:

  • Optimized Na3Zr2Si2PO12 electrolyte achieved an ionic conductivity of 1.74 × 10^-3 S cm^-1 at 25 °C.
  • Reduced interfacial area-specific resistance to 70 ohm cm^-2, enhancing resistance to Na dendrite growth.
  • All-solid-state sodium metal batteries demonstrated 87.4% capacity retention after 300 cycles at 100 mA g^-1.

Conclusions:

  • The interface dynamic control (IDC) strategy effectively ensures stable operation of NASICON-based solid-state sodium batteries.
  • The developed strategy offers a new route for rational interface design in solid electrolytes for high energy-density and safe electrochemical energy storage.