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Prefabrication of "Trinity" Functional Binary Layers on a Silicon Surface to Develop High-Performance Lithium-Ion
Weibo Huang1, Yan Wang1,2, Linze Lv1
1College of Energy & Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou, Jiangsu 215006, People's Republic of China.
ACS Nano
|January 25, 2023
Summary
Researchers developed a novel functional layer for silicon anodes, enhancing battery performance and longevity. This breakthrough addresses volume expansion issues, paving the way for next-generation batteries.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- Silicon (Si) anodes are promising for next-generation batteries due to their high capacity.
- Si anodes suffer from interface side reactions and volume expansion, limiting their practical application.
- Stabilizing the silicon anode interface is crucial for improving battery performance.
Purpose of the Study:
- To develop a functional interfacial layer for silicon anodes to mitigate volume expansion and side reactions.
- To enhance the stability and electrochemical performance of silicon anodes.
- To investigate the formation and properties of a novel hybrid solid-electrolyte interphase (SEI).
Main Methods:
- Co-dissolution method to create a "trinity" functional layer (AN) on the Si surface.
- Utilizing azodicarbonamide and 4-nitrobenzenesulfonyl fluoride for the functional layer.
- Electrochemical testing of Si@AN11 electrodes and full-cell configurations.
Main Results:
- The AN interfacial layer induced beneficial electrolyte decomposition, forming a stable hybrid SEI.
- The Si@AN11 electrode demonstrated excellent capacity retention (1407.9 mAh g⁻¹ after 500 cycles) and rate capability (1773.5 mAh g⁻¹ at 10 C).
- A LiNi₀.₅Co₀.₂Mn₀.₃O₂//Si@AN11 full-cell maintained 141.2 mAh g⁻¹ after 350 cycles.
Conclusions:
- The developed "trinity" functional AN layer effectively stabilizes silicon anodes.
- This approach enhances mechanical strength, suppresses electrolyte depletion, and maintains ion/electron transport.
- The strategy of creating composite artificial layers shows potential for next-generation electrode development.
