Multilevel Gradient-Ordered Silicon Anode with Unprecedented Sodium Storage
© 2023 Wiley-VCH GmbH..
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.
| Medienart: |
E-Artikel |
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| Erscheinungsjahr: |
2024 |
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| Erschienen: |
2024 |
| Enthalten in: |
Zur Gesamtaufnahme - volume:36 |
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| Enthalten in: |
Advanced materials (Deerfield Beach, Fla.) - 36(2024), 7 vom: 28. Feb., Seite e2310270 |
| Sprache: |
Englisch |
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| Beteiligte Personen: |
Li, Ying [VerfasserIn] |
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| Links: |
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| Themen: |
Gradient-order structure |
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| Anmerkungen: |
Date Revised 15.02.2024 published: Print-Electronic Citation Status PubMed-not-MEDLINE |
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| doi: |
10.1002/adma.202310270 |
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| funding: |
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| Förderinstitution / Projekttitel: |
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| 520 | |a 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 | ||
| 650 | 4 | |a Journal Article | |
| 650 | 4 | |a gradient-order structure | |
| 650 | 4 | |a silicon anode | |
| 650 | 4 | |a sodium storage mechanism | |
| 650 | 4 | |a sodium-ion batteries | |
| 650 | 4 | |a universality of electrochemical reconstruction | |
| 700 | 1 | |a Wu, Feng |e verfasserin |4 aut | |
| 700 | 1 | |a Li, Yu |e verfasserin |4 aut | |
| 700 | 1 | |a Feng, Xin |e verfasserin |4 aut | |
| 700 | 1 | |a Zheng, Lumin |e verfasserin |4 aut | |
| 700 | 1 | |a Liu, Mingquan |e verfasserin |4 aut | |
| 700 | 1 | |a Li, Shuqiang |e verfasserin |4 aut | |
| 700 | 1 | |a Qian, Ji |e verfasserin |4 aut | |
| 700 | 1 | |a Wang, Zhaohua |e verfasserin |4 aut | |
| 700 | 1 | |a Ren, Haixia |e verfasserin |4 aut | |
| 700 | 1 | |a Gong, Yuteng |e verfasserin |4 aut | |
| 700 | 1 | |a Wu, Chuan |e verfasserin |4 aut | |
| 700 | 1 | |a Bai, Ying |e verfasserin |4 aut | |
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