Multilevel Gradient-Ordered Silicon Anode with Unprecedented Sodium Storage

Ying Li, Feng Wu, Yu Li*, Xin Feng, Lumin Zheng, Mingquan Liu, Shuqiang Li, Ji Qian, Zhaohua Wang, Haixia Ren, Yuteng Gong, Chuan Wu*, Ying Bai*

*此作品的通讯作者

科研成果: 期刊稿件文章同行评审

4 引用 (Scopus)

摘要

While cost-effective sodium-ion batteries (SIBs) with crystalline silicon anodes promise high theoretical capacities, they perform poorly because silicon stores sodium ineffectively (capacity <40 mAh g−1). To address this issue, herein an atomic-order structural-design tactic is adopted for obtaining unique multilevel gradient-ordered silicon (MGO-Si) by simple electrochemical reconstruction. In situ-formed short-range-, medium-range-, and long-range-ordered structures construct a stable MGO-Si, which contributes to favorable Na–Si interaction and fast ion diffusion channels. These characteristics afford a high reversible capacity (352.7 mAh g−1 at 50 mA g−1) and stable cycling performance (95.2% capacity retention after 4000 cycles), exhibiting record values among those reported for pure silicon electrodes. Sodium storage of MGO-Si involves an adsorption–intercalation mechanism, and a stepwise construction strategy of gradient-ordered structure further improves the specific capacity (339.5 mAh g−1 at 100 mA g−1). Reconstructed Si/C composites show a high reversible capacity of 449.5 mAh g−1, significantly better than most carbonaceous anodes. The universality of this design principle is demonstrated for other inert or low-capacity materials (micro-Si, SiO2, SiC, graphite, and TiO2), boosting their capacities by 1.5–6 times that of pristine materials, thereby providing new solutions to facilitate sodium storage capability for better-performing battery designs.

源语言英语
文章编号2310270
期刊Advanced Materials
36
7
DOI
出版状态已出版 - 15 2月 2024

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Li, Y., Wu, F., Li, Y., Feng, X., Zheng, L., Liu, M., Li, S., Qian, J., Wang, Z., Ren, H., Gong, Y., Wu, C., & Bai, Y. (2024). Multilevel Gradient-Ordered Silicon Anode with Unprecedented Sodium Storage. Advanced Materials, 36(7), 文章 2310270. https://doi.org/10.1002/adma.202310270