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Engineering Multifunctional Binders for Micro-Silicon Anodes: Mechanisms, Strategies, and Applications
Xuqi Lin1,2, Zimo Huang1,3, Yuhao Liang1,2
1Institute for Sustainable Transformation, School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou, 510006, China.
Small (Weinheim an Der Bergstrasse, Germany)
|November 20, 2025
Summary
Micro-sized silicon anodes show commercial promise for lithium-ion batteries but face cycling challenges. Innovative binder strategies are crucial for stabilizing micro-silicon (micro-Si) anodes and enabling their widespread adoption.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- Silicon anodes offer high capacity for next-generation lithium-ion batteries.
- Micro-sized silicon (micro-Si) presents commercial advantages over nano-silicon due to cost and density.
- Micro-Si anodes suffer from stress, lithium trapping, and unstable solid electrolyte interphase (SEI) formation during cycling.
Purpose of the Study:
- To review the advantages and limitations of nano-Si and micro-Si.
- To elucidate the degradation mechanisms specific to micro-Si anodes.
- To highlight the critical role of binders in overcoming micro-Si anode challenges.
Main Methods:
- Comparative analysis of nano-Si and micro-Si properties and applications.
- Review of state-of-the-art binder design strategies for micro-Si anodes.
- Examination of current advances and practical applications of functional binders.
Main Results:
- Micro-Si anodes possess significant industrial potential despite inherent cycling instabilities.
- Binder selection and design are pivotal in mitigating stress, preventing lithium trapping, and stabilizing the SEI layer.
- Systematic evaluation of binders tailored for micro-Si is currently limited but essential.
Conclusions:
- Binder innovation is key to unlocking the commercial viability of micro-Si anodes.
- Addressing micro-Si degradation mechanisms through advanced binders will accelerate battery technology development.
- Further research into functional binders is necessary for practical micro-Si anode implementation.
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