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Co-sputtering strategy to construct robust sodiophilic interfaces for anode-less sodium metal batteries
Jiawen Dai1, Haoran Wang1, Rui Zhang1
1Hunan Provincial Key Laboratory of Chemical Power Sources, College of Chemistry and Chemical Engineering, Central South University, Changsha, 410083, P. R. China. wanghy419@csu.edu.cn.
Chemical Communications (Cambridge, England)
|September 13, 2024
Summary
A novel copper-bismuth coating improves sodium metal battery performance by enhancing sodiophilicity and stability. This coating facilitates a stable solid electrolyte interphase, boosting battery reversibility without an anode.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- Sodium metal batteries (SMBs) offer high energy density but suffer from poor stability and dendrite formation.
- Anode-less configurations are desirable for SMBs to maximize energy density, but require stable interfaces.
- Achieving stable sodiophilicity and structural integrity is crucial for high-performance SMBs.
Purpose of the Study:
- To develop a composite coating for enhanced sodiophilicity and structural stability in anode-less SMBs.
- To investigate the effect of copper-bismuth composition on battery performance.
- To improve the reversibility and cycling stability of sodium metal anodes.
Main Methods:
- Facile co-sputtering technique to fabricate copper-bismuth composite coatings.
- Electrochemical testing of anode-less SMBs with the composite coating.
- Analysis of the coating's effect on the solid electrolyte interphase (SEI) formation and structural stability.
Main Results:
- The copper-bismuth composite coating effectively enhances sodiophilicity and substrate stability.
- Lower bismuth content in the coating promotes the formation of a thin, dense SEI layer during cycling.
- The anode-less SMBs with the composite coating exhibit improved reversibility and cycling performance.
Conclusions:
- The developed copper-bismuth composite coating is a promising strategy for improving anode-less SMBs.
- The coating's ability to maintain sodiophilicity and form a stable SEI is key to enhanced battery performance.
- This approach offers a pathway towards safer and more efficient sodium metal batteries.
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