In:
Chemistry – A European Journal, Wiley, Vol. 25, No. 51 ( 2019-09-12), p. 11991-11997
Abstract:
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/SiO x @NC structure has been synthesized by a facile magnesio‐thermic reduction, in which the Si and SiO x 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 SiO 2 into Si/SiO x simultaneously. Benefiting from the core–shell structure, the synthesized product exhibited enhanced electrochemical performance as an anode material in LIBs. Particularly, the Si/SiO x @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/SiO x @NC‐650 may be attributed to the core–shell structure as well as the synergistic effect between the Si/SiO x and MOF‐derived N‐doped carbon.
Type of Medium:
Online Resource
ISSN:
0947-6539
,
1521-3765
DOI:
10.1002/chem.201903043
Language:
English
Publisher:
Wiley
Publication Date:
2019
detail.hit.zdb_id:
1478547-X
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