Positive electrode material of lithium-sulfur battery, preparation method thereof and lithium-sulfur battery
A technology for lithium-sulfur batteries and cathode materials, applied in the field of electrochemical energy storage, can solve the problems of reduced cycle stability of lithium-sulfur batteries, weak chemical affinity of polysulfides, and difficulty in inhibiting the dissolution of polysulfides, so as to improve cycle stability. , high stability, strong binding effect
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[0033] see figure 2 , the embodiment of the present application provides a preparation method of a lithium-sulfur battery positive electrode material, comprising the following steps:
[0034] Step S1: Mix solvent, carbon material, surfactant, co-surfactant, precipitant and at least five metal salts to obtain a dispersion.
[0035] Specifically, the solvent and the co-surfactant are mixed according to a certain volume ratio, and the surfactant is added, and then the carbon material, the metal salt and the precipitant are added to obtain the dispersion.
[0036] The solvent includes organic solvents and inorganic solvents. Wherein, the organic solvent is used to dissolve the surfactant, co-surfactant and precipitant, and the inorganic solvent is used to dissolve the metal salt. The miscibility of the organic solvent and the inorganic solvent is beneficial to the sufficient contact between the metal salt and the carbon material, thereby facilitating the growth of the high-entr...
Embodiment 1
[0056] Add 0.4g polyethylene glycol-polypropylene glycol-polyethylene glycol into a mixed solvent composed of water, absolute ethanol and ethylene glycol, wherein the volume of water is 5mL, the volume of absolute ethanol is 10mL, ethylene glycol The volume of alcohol is 25mL; then add 0.4g carbon nanotubes, stir vigorously at room temperature; then add metal salts 0.2mmol copper acetate, 0.2mmol ferrous acetate, 0.2mmol cobalt acetate, 0.2mmol manganese acetate, 0.2mmol nickel acetate , followed by adding 0.14 g of hexamethylenetetramine and vigorously stirring for 45 minutes to obtain a dispersion.
[0057] The dispersion was transferred to a polytetrafluoroethylene reactor, hydrothermally treated at 170°C for 15 hours, and the precipitate obtained from the hydrothermally treated was washed three times with deionized water and absolute ethanol, and then dried at 60°C , to obtain the precursor powder.
[0058] The precursor powder was calcined at 400° C. for 2 hours in a muf...
Embodiment 2
[0063] The difference from Example 1 is that the metal salt is 0.2 mmol of copper acetate, 0.2 mmol of ferrous acetate, 0.2 mmol of cobalt acetate, 0.2 mmol of zinc acetate, and 0.2 mmol of nickel acetate.
[0064] Others are the same as in Embodiment 1, and will not be repeated here.
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