Inorganic Chemicals Industry >
Preparation and sodium storage properties of sulfur-doped Na3（VOPO4）2F cathode materials
Received date: 2023-04-26
Online published: 2024-02-06
The polyanionic Na3（VOPO4）2F material has the characteristics of structural stability，high safety，and high operating voltage.Its open three-dimensional framework structure can provide a pathway for the rapid migration of sodium ions，making it one of the most promising cathode electrode materials for sodium ion batteries at present.However，the rate performance of Na3V2（PO4）2O2F is unsatisfactory because of its poor intrinsic electronic conductivity.Ion doping is an effective strategy for improving the conductivity and electrochemical performance of this material.S2--doped Na3（VOPO4）2S x F was successfully prepared by adding appropriate amounts of thioacetamide in the hydrothermal process.X-ray diffraction and electrochemical impedance spectroscopy results indicated that the doping of S2- could expand ion diffusion channels and reduce charge transfer resistance.The results of galvanostatic intermittent titration technique proved that S2- doping could accelerate ion migration rate.Thus，the Na3（VOPO4）2S x F delivered an excellent electrochemical performance in the sodium ion half-cell，showing a capacity of 66.8 mA·h/g at 30C and retaining 96% of its capacity after 500 cycles at 10C.A sodium ion full cell coupled with the Na3（VOPO4）2S x F cathode and hard carbon anode delivered a high capacity of 121.7 mA·h/g，and the capacity loss after 60 cycles at 1C could be ignored.
Key words： Na3（VOPO4）2F; ion-doping; cathode material; sodium ion batteries
ZHOU Huang , HU Xiaoping , REN Wen , CAO Xinxin . Preparation and sodium storage properties of sulfur-doped Na3（VOPO4）2F cathode materials[J]. Inorganic Chemicals Industry, 2024 , 56(2) : 30 -37 . DOI: 10.19964/j.issn.1006-4990.2023-0239
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