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Double‐Shelled Hollow SiO 2 @N‐C Nanofiber Boosts the Lithium Storage Performance of [PMo 12 O 40 ] 3−
Author(s) -
Hu Hanbin,
Yang Yixin,
Jiang Xiao,
Wang Jiaxin,
Cao Dongwei,
He Lei,
Chen Wei,
Song YuFei
Publication year - 2021
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.202101638
Subject(s) - materials science , anode , lithium (medication) , electrochemistry , chemical engineering , electrolyte , electrospinning , nanofiber , nanotechnology , conductivity , diffusion , electrode , composite material , chemistry , medicine , physics , engineering , thermodynamics , endocrinology , polymer
Polyoxometalates (POMs)‐based materials, with high theoretical capacities and abundant reversible multi‐electron redox properties, are considered as promising candidates in lithium‐ion storage. However, the poor electronic conductivity, low specific surface area and high solubility in the electrolyte limited their practical applications. Herein, a double‐shelled hollow PMo 12 −SiO 2 @N−C nanofiber (PMo 12 −SiO 2 @N−C, where PMo 12 is [PMo 12 O 40 ] 3− , N−C is nitrogen‐doped carbon) was fabricated for the first time by combining coaxial electrospinning technique, thermal treatment and electrostatic adsorption. As an anode material for LIBs, the PMo 12 −SiO 2 @N−C delivered an excellent specific capacity of 1641 mA h g −1 after 1000 cycles under 2 A g −1 . The excellent electrochemical performance benefited from the unique double‐shelled hollow structure of the material, in which the outermost N−C shell cannot only hinder the agglomeration of PMo 12 , but also improve its electronic conductivity. The SiO 2 inner shell can efficiently avoid the loss of active components. The hollow structure can buffer the volume expansion and accelerate Li + diffusion during lithiation/delithiation process. Moreover, PMo 12 can greatly reduce charge‐resistance and facilitate electron transfer of the entire composites, as evidenced by the EIS kinetics study and lithium‐ion diffusion analysis. This work paves the way for the fabrication of novel POM‐based LIBs anode materials with excellent lithium storage performance.