Abstract
In terms of low cost and high capacity, porous silicon (Si)-based anodes prepared from Al-Si dealloying method have been studied in lithium-ion batteries (LIBs) to achieve high energy density. However, porous Si-based anodes suffer from disadvantages of inferior lithium storage behavior and poor cycling stability due to their intrinsic particle size and limited pore space. Here, a novel design strategy is presented for the synthesis of the multidimensional structure Si (MSi-Snx) by introducing Sn and Sr into Al-Si melt. By changing the growth pattern and inhibiting the aggregation growth of the crystalline Si, the micron-sized structure is changed to a multidimensional structure with abundant void space and nano-sized secondary dendrite. Consequently, the MSi-Snx@C anode shows long cycling stability (maintaining 935 mAh g−1 after 1000 cycles) and an outstanding rate capacity (734 mAh g−1 at 2 A g−1) because of the improvement of the ion transport behavior. This strategy shows the application potential of the Al-Si dealloying method for synthesizing low-cost and high-performance Si-based anodes in high energy density LIBs.
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Acknowledgements
The authors provide their gratitude to Hefei Institutes of Physical Science, Chinese Academy of Sciences and University of Science and Technology of China for their support.
Funding
This work was financially supported by National Natural Science Foundation of China (No.51804294, No.51874272, and No.52111540265); Anhui Provincial Natural Science Foundation (3No. 1808085ME121); Key Laboratory of Photovoltaic and Energy Conservation Materials, Chinese Academy of Science (PECL2021QN003); HFIPS President Foundation (YZJJZX202018); International Clean Energy Talent Program by China Scholarship Council.
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Juxuan Ding: Methodology, Validation, Data Curation, Writing Original Draft, Writing-Review & Editing. Jifei Sun: Writing-Review & Editing, Validation, Conceptualization, Data Curation. Boyuan Ban: Methodology. Validation. Xuesong Jiang: Investigation. Xiaoxiao Zhu: Investigation. Zhangchao Mo: Investigation. Ling Wang: Investigation. Jian Chen: Validation, Supervision, Investigation, Resources, Writing-Review & Editing.
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Highlights
1. Sn element increases viscosity of Al-Si melt.
2. Morphological control is implemented in Al-Si dealloying method.
3. Multidimensional Si with abundant void space and secondary dendrites is synthesized.
4. Synthesized Si anode delivers excellent cycling stability and high energy density.
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Ding, J., Sun, J., Ban, B. et al. Multidimensional Silicon Anodes via Sn Modified Al-Si Dealloying for high Performance lithium-ion Batteries. Silicon (2024). https://doi.org/10.1007/s12633-024-03015-7
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DOI: https://doi.org/10.1007/s12633-024-03015-7