Stable Hollow‐Structured Silicon Suboxide‐Based Anodes toward High‐Performance Lithium‐Ion Batteries

Silicon has been regarded as an attractive high‐capacity anode material for next‐generation lithium‐ion batteries (LIBs). However, Si anodes suffer from huge volume variation during cycling, which poses a critical challenge for stable battery operation. Compared with Si, Si suboxide (SiOx) is one of...

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Bibliographic Details
Published in:Advanced functional materials 2021-06, Vol.31 (25), p.n/a
Main Authors: Tian, Hao, Tian, Huajun, Yang, Wu, Zhang, Fan, Yang, Wang, Zhang, Qiaobao, Wang, Yong, Liu, Jian, Silva, S. Ravi P., Liu, Hao, Wang, Guoxiu
Format: Article
Language:English
Subjects:
anode materials
Anodes
Carbon nanotubes
Cycles
Density
Electrode materials
hollow structure
Lithium-ion batteries
Materials science
metal organic frameworks
Silicon
silicon suboxide
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Summary:Silicon has been regarded as an attractive high‐capacity anode material for next‐generation lithium‐ion batteries (LIBs). However, Si anodes suffer from huge volume variation during cycling, which poses a critical challenge for stable battery operation. Compared with Si, Si suboxide (SiOx) is one of the most promising candidates for high‐energy‐density LIBs because of its alleviated swelling and highly stable cycling performance. Whereas, the poor electronic conductivity and low (initial) Coulombic efficiency of SiOx anodes severely hinder practical applications for LIBs. Herein, for the first time, these issues are successfully solved through rationally designing hollow‐structured SiOx@carbon nanotubes (CNTs)/C architectures with graphitic carbon coatings and in situ growth of CNTs. When applied as anodes in LIBs, the SiOx@CNTs/C anodes exhibit high reversible capacity, high initial Coulombic efficiency (88%), outstanding cycling performance, and extraordinary mechanical strength during the calendaring process (200 MPa). This work paves the way for developing SiOx‐based anode materials for high‐energy‐density LIBs. A hollow‐structured silicon suboxide composite (SiOx@CNTs/C) with graphitic carbon coatings and in situ growth of carbon nanotubes is successfully synthesized. The as‐prepared anode materials exhibit superior rate capability, excellent cycling stability, and extraordinary mechanical strength with high initial Coulombic efficiency as an anode in lithium‐ion batteries.
ISSN:1616-301X
1616-3028
DOI:10.1002/adfm.202101796