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Engineering the NASICON electrolyte/Na anode interface with amorphous bismuth oxide for sodium batteries
Jinze Wu1,2, Hui Liu1,2, Yongdan Li1,2,3
1State Key Laboratory of Chemical Engineering, Tianjin Key Laboratory of Applied Catalysis Science and Technology, School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300072, China. cjzhang@tju.edu.cn.
Chemical Communications (Cambridge, England)
|July 3, 2023
Summary
Amorphous bismuth oxide coatings on NASICON electrolytes enhance anode interfacial properties for sodium batteries. This enables stable cycling in sodium symmetric cells, improving battery performance and longevity.
Area of Science:
- Materials Science
- Electrochemistry
- Solid-State Chemistry
Background:
- Interfacial resistance is a major challenge in solid-state sodium batteries.
- Amorphous materials can offer unique properties for solid-electrolyte interphases.
- NASICON (Natrium Super Ionic CONductor) electrolytes are promising for sodium-ion applications.
Purpose of the Study:
- To investigate the effect of amorphous bismuth oxide on the anode-electrolyte interface.
- To evaluate the electrochemical performance of NASICON electrolytes modified with amorphous bismuth oxide.
- To assess the interfacial stability and cycling performance of sodium symmetric cells.
Main Methods:
- Photochemical metal-organic deposition (PMOD) was used to prepare amorphous BiO coatings on NASICON.
- Sodium symmetric cells (Na||NASICON||Na) were assembled with coated and uncoated electrolytes.
- Electrochemical impedance spectroscopy (EIS) and galvanostatic cycling were performed to evaluate interfacial properties and stability.
Main Results:
- Amorphous BiO coatings significantly improved interfacial properties at the anode side.
- The modified Na symmetric cells achieved a critical current density of 1.2 mA cm-2.
- Stable cycling at 0.5 mA cm-2 for 1000 hours at 30 °C was demonstrated.
Conclusions:
- Amorphous BiO coatings are effective in reducing interfacial resistance in NASICON-based sodium batteries.
- The PMOD method provides a viable route for interfacial engineering of solid electrolytes.
- The improved interfacial properties translate to enhanced cycling stability and performance in sodium symmetric cells.
