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SiO 2 /Carbon Composite Microspheres with Hollow Core–Shell Structure as a High‐Stability Electrode for Lithium‐Ion Batteries
Author(s) -
Jiao Miaolun,
Liu Kunlin,
Shi Zhiqiang,
Wang Chengyang
Publication year - 2017
Publication title -
chemelectrochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 59
ISSN - 2196-0216
DOI - 10.1002/celc.201600658
Subject(s) - materials science , composite number , anode , polyacrylonitrile , electrolyte , chemical engineering , nanoparticle , lithium (medication) , lithium ion battery , electrochemistry , composite material , electrode , nanotechnology , battery (electricity) , chemistry , polymer , medicine , power (physics) , physics , quantum mechanics , endocrinology , engineering
The SiO 2 /carbon composite material used as a lithium‐ion battery (LIB) anode was synthesized by aerosol spraying a mixture of polyvinyl alcohol (PVA) solution and SiO 2 nanoparticles, followed by coating polyacrylonitrile (PAN) on the SiO 2 /PVA surface and an annealing treatment at 800 °C. The as‐prepared SiO 2 /po‐C@C has a hollow core–shell structure. The hollow section contributes to accommodate the volume expansion of SiO 2 nanoparticles; the skeleton of porous carbon in the core not only enhances the electronic conductivity, but also provides the lithium‐ion diffusion path; the PAN‐based carbon shell benefits for forming a stable solid electrolyte interphase (SEI) film. This core–shell structure could partly alleviate the pulverization of the SiO 2 /po‐C@C particles and also perform excellent electrochemical performances. Compared with the SiO 2 @C composite, the SiO 2 /po‐C@C composite possesses a high specific charge capacity of 669.8 mA h g −1 at a current density of 100 mA g −1 after 100 charge and discharge cycles with a high capacity retention of 98.6 %. Therefore, the SiO 2 /po‐C@C composite with a hollow core‐shell structure shows great potential as an anode material for future LIBs.