Polymer-based sulfur positive electrode material and preparation method thereof
A sulfur cathode material and polymer technology, applied in the field of polymer-based sulfur cathode materials and their preparation, can solve the problems of slow reaction kinetics and poor cycle stability, and achieve the effects of accelerating conversion, realizing adsorption and high coulombic efficiency
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[0027] The specific embodiment provides a preparation method of a polymer-based sulfur cathode material, comprising the following steps:
[0028] S1. Add the polyacrylonitrile resin raw material to the solution containing the cross-linking agent, heat up to 100-140 ° C under stirring for 1-10 hours, and after the reaction is completed, the cross-linked polyacrylonitrile resin is obtained by cooling, washing and drying; Wherein, the mass ratio of the polyacrylonitrile resin and the solution containing the cross-linking agent is 1:1-20, and the mass fraction of the cross-linking agent in the solution containing the cross-linking agent is 10-100%; the The crosslinking agent is one or more of tetraethylenepentamine, triethylenetetramine, diethylenetriamine and ethylenediamine; the crosslinking degree of the crosslinked polyacrylonitrile resin is 5-40%; The washing and drying process is as follows: washing the obtained cross-linked resin with deionized water and ethanol successivel...
Embodiment 1
[0034] This embodiment proposes a polymer-based sulfur cathode material, which is prepared by the following steps:
[0035] S1. Add 10g of polyacrylonitrile resin raw material into a reaction flask containing 200g of 10% ethylenediamine glycol solution, heat up to 100°C under stirring for 10h, and after the reaction is completed, cool down, use deionized water and ethanol in turn Wash to neutrality, vacuum dry to constant weight (vacuum degree is 0.10Mpa, temperature is 80°C) to obtain cross-linked polyacrylonitrile resin, cross-linking degree is 5%, ion exchange capacity is 0.9mmol / g;
[0036] S2. Add 1 g of the cross-linked polyacrylonitrile resin into a conical flask containing 500 mL of copper sulfate aqueous solution with a concentration of 500 ppm, adjust the pH to 4 with dilute sulfuric acid, stir and react at room temperature for 2 h, and then wash off the surface with deionized water. Copper ions, vacuum-dried to constant weight (vacuum degree is 0.10Mpa, temperature ...
Embodiment 2
[0039] This embodiment proposes a polymer-based sulfur cathode material, which is prepared by the following steps:
[0040] S1. Add 10g of polyacrylonitrile resin raw material into a reaction flask containing 200g of 100% diethylenetriamine, heat up to 140 °C under stirring for 1 hour, and after the reaction is completed, cool and wash with deionized water and ethanol to medium to obtain a cross-linked polyacrylonitrile resin with a cross-linking degree of 40% and an ion exchange capacity of 2.8 mmol / g;
[0041] S2. Add 0.8 g of the cross-linked polyacrylonitrile resin into a conical flask containing 500 mL of a nickel sulfate aqueous solution with a concentration of 400 ppm, adjust the pH to 5 with dilute sulfuric acid, stir and react at room temperature for 10 h, and then wash off with deionized water Surface nickel ions, vacuum-dried to constant weight (vacuum degree is 0.08Mpa, temperature is 100°C) to obtain cross-linked polyacrylonitrile resin loaded with nickel ions, an...
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