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Preparation of a Si/SiO 2 –Ordered‐Mesoporous‐Carbon Nanocomposite as an Anode for High‐Performance Lithium‐Ion and Sodium‐Ion Batteries
Author(s) -
Zeng Lingxing,
Liu Renpin,
Han Lei,
Luo Fenqiang,
Chen Xi,
Wang Jianbiao,
Qian Qingrong,
Chen Qinghua,
Wei Mingdeng
Publication year - 2018
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201704780
Subject(s) - materials science , anode , amorphous solid , lithium (medication) , mesoporous material , nanocomposite , chemical engineering , nanoparticle , composite number , ion , etching (microfabrication) , nanotechnology , composite material , electrode , layer (electronics) , chemistry , crystallography , catalysis , organic chemistry , medicine , engineering , endocrinology
In this work, an Si/SiO 2 –ordered‐mesoporous carbon (Si/SiO 2 –OMC) nanocomposite was initially fabricated through a magnesiothermic reduction strategy by using a two‐dimensional bicontinuous mesochannel of SiO 2 –OMC as a precursor, combined with an NaOH etching process, in which crystal Si/amorphous SiO 2 nanoparticles were encapsulated into the OMC matrix. Not only can such unique porous crystal Si/amorphous SiO 2 nanoparticles uniformly dispersed in the OMC matrix mitigate the volume change of active materials during the cycling process, but they can also improve electrical conductivity of Si/SiO 2 and facilitate the Li + /Na + diffusion. When applied as an anode for lithium‐ion batteries (LIBs), the Si/SiO 2 –OMC composite displayed superior reversible capacity (958 mA h g −1 at 0.2 A g −1 after 100 cycles) and good cycling life (retaining a capacity of 459 mA h g −1 at 2 A g −1 after 1000 cycles). For sodium‐ion batteries (SIBs), the composite maintained a high capacity of 423 mA h g −1 after 100 cycles at 0.05 A g −1 and an extremely stable reversible capacity of 190 mA h g −1 was retained even after 500 cycles at 1 A g −1 . This performance is one of the best long‐term cycling properties of Si‐based SIB anode materials. The Si/SiO 2 –OMC composites exhibited great potential as an alternative material for both lithium‐ and sodium‐ion battery anodes.