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Preparation and Electrochemical Properties of Sulfur Doped Nanometer Li2FeSiO4/C
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Affiliation:

Lanzhou University of Technology

Clc Number:

TQ630

Fund Project:

1.The controllable preparation of heteroatomic hard carbon with high lithium storage capacity based on microporous conjugated polymer by National Natural Science Foundation of China (21,968,016) 2. Research on the structure regulation and lithium storage characteristics of porous hard carbon and its composite anode materials based on microporous conjugated polymers from the National Natural Science Foundation of China (21466020)

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    Abstract:

    Li2FeSiO4-xSx/C (x=0,0.01,0.02,0.03) nano cathode materials were prepared by solid state reaction. The micro morphology, crystal structure and electrochemical properties of the materials were studied by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), X-ray photoelectron spectroscopy (XPS), Raman spectroscopy (Raman), infrared absorption spectroscopy (FTIR) and constant current charge discharge tests. The results show that the Li2FeSiO3.98S0.02/C morphology is nano spherical, and the average particle size is 45.38nm. The nano particle size is conducive to shortening the diffusion path of Li+; Carbon coating can inhibit the growth of nanocrystals and enhance the conductivity of materials; Sulfur doping can expand the tunnel spacing of materials and improve the magnification performance of materials. Li2FeSiO3.98S0.02/C shows high charge discharge specific capacity, excellent rate performance and cycle stability. The specific capacity of the first discharge at 0.1C is up to 180.1mAhg-1, and the capacity retention rate after 100 cycles at 10C is 91.3%.

    Reference
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History
  • Received:December 12,2022
  • Revised:March 10,2023
  • Adopted:March 10,2023
  • Online: August 17,2023
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