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A Novel Anode with Superior Cycling Stability Based on Silicon Encapsulated in Shell‐Like rGO/CNT Architecture for Lithium‐Ion Batteries
Author(s) -
Hu Bingmeng,
Kuang Xuanlin,
Xu Sixing,
Wang Xiaohong
Publication year - 2019
Publication title -
energy technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.91
H-Index - 44
eISSN - 2194-4296
pISSN - 2194-4288
DOI - 10.1002/ente.201801047
Subject(s) - anode , materials science , silicon , electrolyte , nanocomposite , graphene , lithium (medication) , nanotechnology , carbon nanotube , electrode , electrochemistry , composite material , chemical engineering , optoelectronics , chemistry , medicine , endocrinology , engineering
Although silicon is intensively pursued as the most promising anode material for lithium‐ion batteries (LIBs), the extensive utilization of silicon is still impeded by severe capacity fading and limited cycle life. A robust layer‐by‐layer architecture of the silicon‐based anode, which shields silicon nanoparticles (SiNPs) with shell‐like reduced graphene oxide (rGO) layers supported by the intertwined framework of carbon nanotubes (CNTs), is developed. Such structure guarantees high reversible capacity and cyclic stability by enclosing SiNPs in the stable shells, which supplies sufficient void space for the expansion of SiNPs and prevents electrolyte‐consuming capacity. In addition, the electrode kinetics in the plane direction are enhanced due to the intimate contact between SiNPs and highly conductive rGO layers, while the highly conductive framework of CNTs has a similar impact on that in the direction of the vertical plane. As a result, the nanocomposite anode demonstrates an improved cycling stability with 1438.31 mAh g −1 after 100 cycles and a superior rate performance of 1112.64 mAh g −1 at 5 C rate in a half‐cell electrochemical test.