Lithium-sulfur battery positive electrode material with core-shell structure as well as preparation method and application thereof
A cathode material, lithium-sulfur battery technology, applied in battery electrodes, lithium storage batteries, positive electrodes, etc., can solve the problems of volume expansion conductivity, poor cycle stability, poor safety performance, reduced ion conductivity, and low utilization of active materials. , to reduce the shuttle effect, improve conductivity and stability, and inhibit the shuttle effect
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Embodiment 1
[0033] (1) Add 10 mL of deionized water to a mixture of 0.31 g of sodium borohydride and 0.32 g of selenium powder, and cool the reaction in an ice bath at 0°C for 6 hours, and the colorless supernatant is sodium hydrogen selenide solution (NaHSe) . During the reaction, the reaction vessel was covered with a rubber stopper with a needle to relieve the pressure from the hydrogen generated.
[0034] (2) Dissolve 1.19g zinc nitrate hexahydrate in 400ml deionized water under magnetic stirring, add 700μL MPA, add 10M sodium hydroxide solution to adjust the pH of the mixed solution to 11.0, under nitrogen atmosphere, use a syringe to ) 1.2ml of the obtained NaHSe solution was injected into the solution, 0.15g of multi-walled carbon nanotubes was added, and stirred for 30 minutes. Then the above mixture solution was transferred to a three-necked flask and refluxed at 80°C for 80 minutes to obtain ZnSe-CNTs.
[0035] (3) The 0.2g zinc selenide quantum dot modified carbon nanotube ma...
Embodiment 2
[0042] (1) 10 mL of deionized water was added to a mixture of 0.465 g of sodium borohydride and 0.48 g of selenium powder, and the reaction was cooled in an ice bath at 0° C. for 8 hours, and the supernatant was sodium hydrogen selenide solution (NaHSe). During the reaction, the reaction vessel was covered with a rubber stopper with a needle to relieve the pressure from the hydrogen generated.
[0043] (2) Dissolve 2.97g of zinc nitrate hexahydrate in 400ml of deionized water under magnetic stirring, add 700μL of MPA, add 8M sodium hydroxide solution to adjust the pH of the solution to 11.2, and under a nitrogen atmosphere, use a syringe to dissolve step (1) 2.4 ml of the obtained NaHSe solution was injected into the solution, 0.2 g of multi-walled carbon nanotubes were added, and stirred for 30 minutes. Then the above mixture solution was transferred to a three-necked flask, and refluxed at 100° C. for 120 minutes to obtain ZnSe-CNTs material.
[0044] (3) The 0.2g zinc sele...
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