Journal
CHEMISTRY-A EUROPEAN JOURNAL
Volume 25, Issue 51, Pages 11991-11997Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201903043
Keywords
anodes; lithium-ion batteries (LIBs); metal-organic frameworks (MOFs); MOF-derived Si; SiOx@NC; nanospheres; silicon
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Funding
- National Natural Science Foundation of China [21471090 and 61527809] Funding Source: Medline
- Development Programs of Shandong Province [2017GGX40101, 2017CXGC0503] Funding Source: Medline
- Taishan Scholar Foundation of Shandong Province [ts201511004] Funding Source: Medline
- Shenzhen basic research program [JCYJ20180305164424922] Funding Source: Medline
- Fundamental Research Funds of Shandong University [2018JC023] Funding Source: Medline
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Silicon (Si)-based anode materials with suitable engineered nanostructures generally have improved lithium storage capabilities, which provide great promise for the electrochemical performance in lithium-ion batteries (LIBs). Herein, a metal-organic framework (MOF)-derived unique core-shell Si/SiOx@NC structure has been synthesized by a facile magnesio-thermic reduction, in which the Si and SiOx matrix were encapsulated by nitrogen (N)-doped carbon. Importantly, the well-designed nanostructure has enough space to accommodate the volume change during the lithiation/delithiation process. The conductive porous N-doped carbon was optimized through direct carbonization and reduction of SiO2 into Si/SiOx simultaneously. Benefiting from the core-shell structure, the synthesized product exhibited enhanced electrochemical performance as an anode material in LIBs. Particularly, the Si/SiOx@NC-650 anode showed the best reversible capacities up to 724 and 702 mAh g(-1) even after 100 cycles. The excellent cycling stability of Si/SiOx@NC-650 may be attributed to the core-shell structure as well as the synergistic effect between the Si/SiOx and MOF-derived N-doped carbon.
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