Abstract
Nonstoichiometric microstructured silicon suboxide (SiOx) could be an attractive alternative to graphite as the anode materials of lithium-ion batteries (LIBs) due to its high theoretical capacity and low cost. However, practical applications of SiOx are hampered by their inferior inherent conductivity and distinct volume changes during cycling. In this work, in order to address these issues simultaneously, we designed and fabricated SiOx-based anode materials with TiO1−yNy-carbon coating layer (SiOx@TiON-C) using a scalable solvothermal and thermal reduction method. Our systematic investigations suggest that TiO1−yNy and the C coating layer could accommodate large volume variation and promote electrical conductivity of SiOx during cycling, respectively. As a result, the as-prepared SiOx@TiON-C anode exhibits superior lithium storage performance. Specifically, the resultant SiOx@TiON-C anode could deliver an outstanding reversible capacity of 750.2 mA h g−1 at 500 mA g−1 after 500 cycles, high initial Coulombic efficiency of 75.1% and excellent rate capability. This work offers a promising approach to promote the practical commercialization of microstructured SiOx-based anode materials for next-generation LIBs.
摘要
非化学计量微米氧化硅(SiOx)由于其高理论容量和低成本, 有望 成为锂离子电池石墨负极材料的替代品. 然而, SiOx 的实际应用仍然受 到其较差的固有导电性和循环过程中明显的体积变化的阻碍. 在本工 作中, 为了同时解决这些问题, 我们使用可规模化的溶剂热和热还原方 法制备了具有TiO1−yNy-C涂层的SiOx 基负极材料(SiOx@TiON-C). 我们 通过系统性研究发现, TiO1−yNy-C涂层可以适应SiOx 循环过程中大的体 积变化且有效提高其导电性. 因此, SiOx @TiON-C负极具有突出的储锂 性能. 具体而言, SiOx@TiON-C负极可以在500 mA g−1 的电流密度下循 环500圈后仍保持750.2 mA h g−1 的优异可逆容量, 75.1%的初始库仑效 率和优异的倍率性能. 这项工作为促进下一代锂离子电池微米SiOx 基 负极材料的实际商业化提供了一种很有前途的方法.
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (52102225 and 51874104) and the Start-up Research Grant of Guangdong University of Technology, China (220413729).
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Author contributions Huang X carried out the experiments, analyzed the data and wrote the manuscript; Wei X took park in the data analysis, and revised the manuscript; Lai G contributed to the data analysis, review, and editing; Lin Z directed the whole project. All authors contributed to the general discussion.
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Xiuhuan Huang received her Bachelor degree from Guilin University of Technology in 2017. She is currently a Master candidate at Guangdong University of Technology (GDUT). Her research mainly focuses on the design and fabrication of anode materials for LIBs.
Xiujuan Wei received her PhD degree from Wuhan University of Technology in 2018. At the same year, she joined GDUT as a high-level talent under the “Youth Hundred Talents Plan”. Her research interest covers the high specific energy secondary battery electrode materials and functional polymer binders.
Zhan Lin received his PhD degree (2010) from the North Carolina State University, and now works as a professor at the College of Chemical Engineering and Light Industry, GDUT. He is currently engaged in basic research on the design and application of new energy materials and devices, especially in the field of lithium secondary batteries.
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Boosting lithium storage of SiOx via a dual-functional titanium oxynitride-carbon coating for robust and high-capacity lithium-ion batteries
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Huang, X., Wei, X., Lai, G. et al. Boosting lithium storage of SiOx via a dual-functional titanium oxynitride-carbon coating for robust and high-capacity lithium-ion batteries. Sci. China Mater. 67, 85–92 (2024). https://doi.org/10.1007/s40843-023-2643-8
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DOI: https://doi.org/10.1007/s40843-023-2643-8