Efficient Sodium Storage in Rolled‐Up Amorphous Si Nanomembranes |
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| Authors: | Shaozhuan Huang Lixiang Liu Yun Zheng Ye Wang Dezhi Kong Yingmeng Zhang Yumeng Shi Lin Zhang Oliver. G. Schmidt Hui Ying Yang |
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| Affiliation: | 1. Pillar of Engineering Product Development, Singapore University of Technology and Design, Singapore, Singapore;2. Institute for Integrative Nanosciences, Leibniz Institute for Solid State and Materials Research Dresden, Dresden, Germany;3. School of Materials Science and Engineering, Nanyang Technological University, Singapore, Singapore;4. International Collaborative Laboratory of 2D Materials for Optoelectronic Science & Technology of Ministry of Education, Engineering Technology Research Center for 2D Material Information Function Devices and Systems of Guangdong Province, College of Optoelectronic Engineering, Shenzhen University, Shenzhen, China;5. Institute for Solid State Physics, Leibniz Universit?t Hannover, Hannover, Germany |
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| Abstract: | Alloying‐type materials are promising anodes for high‐performance sodium‐ion batteries (SIBs) because of their high capacities and low Na‐ion insertion potentials. However, the typical candidates, such as P, Sn, Sb, and Pb, suffer from severe volume changes (≈293–487%) during the electrochemical reactions, leading to inferior cycling performances. Here, a high‐rate and ultrastable alloying‐type anode based on the rolled‐up amorphous Si nanomembranes is demonstrated. The rolled‐up amorphous Si nanomembranes show a very small volume change during the sodiation/desodiation processes and deliver an excellent rate capability and ultralong cycle life up to 2000 cycles with 85% capacity retention. The structural evolution and pseudocapacitance contribution are investigated by using the ex situ characterization techniques combined with kinetics analysis. Furthermore, the mechanism of efficient sodium‐ion storage in amorphous Si is kinetically analyzed through an illustrative atomic structure with dangling bonds, offering a new perspective on understanding the sodium storage behavior. These results suggest that nanostructured amorphous Si is a promising anode material for high‐performance SIBs. |
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| Keywords: | alloying‐type anode materials amorphous Si nanomembranes dangling bonds pseudocapacitance contributions sodium‐ion batteries sodium storage mechanisms |
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