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Nanocaging Silicon Nanoparticles into a Porous Carbon Framework toward Enhanced Lithium‐Ion Storage
Author(s) -
Hou Zhidong,
Liu Huanyan,
Chen Panpan,
Wang JianGan
Publication year - 2021
Publication title -
particle and particle systems characterization
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.877
H-Index - 56
eISSN - 1521-4117
pISSN - 0934-0866
DOI - 10.1002/ppsc.202100107
Subject(s) - anode , materials science , carbon fibers , lithium (medication) , energy storage , chemical engineering , nanosheet , electrochemistry , silicon , nanoparticle , porosity , nanotechnology , ion , composite number , electrode , composite material , chemistry , optoelectronics , medicine , power (physics) , physics , organic chemistry , quantum mechanics , engineering , endocrinology
Silicon (Si) shows overwhelming promise as the high‐capacity anode material of Li‐ion batteries with high energy density. However, Si‐based anodes are subjected to a limited electrochemical cycling lifetime due to their large volume change. Herein, a honeycomb‐like biomass‐derived carbon nanosheet framework is reported to encapsulate Si nanoparticles via a facile molten salt templating method. The carbon framework provides sufficient void space for effectively accommodating the large volume expansion of Si upon Li + insertion. Moreover, the interconnected carbon skeletons afford fast electron/ion transport pathways for improving the reaction kinetics. Consequently, the porous Si/carbon composite could exhibit a high and stable Li storage capacity of 1022 mAh g −1 at 0.2 A g −1 over 100 cycles along with superior rate capability (555 mAh g −1 at 5 A g −1 ). This study demonstrates an effective structural design strategy for Si‐based anodes toward stable lithium energy storage.