A kind of preparation method of carbon quantum dot modified lithium-sulfur battery cathode material
A technology of carbon quantum dots and cathode materials, which is applied in the field of preparation of cathode materials for lithium-sulfur batteries modified by carbon quantum dots, to achieve the effects of simple process, reducing battery polarization, improving capacity and cycle stability
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Embodiment 1
[0025] Step 1: Preparation of polyethylene imine functionalized carbon surface of the quantum dot, the specific steps:
[0026] Polyethyleneimine was placed in a glass vial placed on a heating stage 400 ℃ 50min carbonization treatment is performed, the process ends after the platform is removed from the heated glass vial, cooled to room temperature, and then the glass sample after treatment flask was added deionized water, sonicated for 30min, carbon quantum dots dispersed in deionized water to form a dispersion of carbon quantum dots, the quantum dots carbon dispersion was placed in a dialysis bag and dialyzed to remove the unreacted polyethyleneimine amine, after the dialysis treatment quantum dot carbon dispersion was freeze-dried to obtain the functionalized carbon surface polyethyleneimine quantum dot;
[0027] Step 2: The polyethyleneimine functionalized quantum dot surface of the carbon, sulfur powder, acetylene black and polyvinylidene fluoride as a mass ratio of 2: 10: 5:...
Embodiment 2
[0032] Lithium-sulfur battery was prepared following the procedure of Example 1, only the adjustment in step 3 in the sulfur coating amount of the carbon paper current collector surface was 5.2mg / cm 2 Other steps unchanged. Embodiment lithium-sulfur battery obtained in Example 2 in 6mA / cm 2 For capacity and long cycle coulombic efficiency performance as FIG constant current charge and discharge at a current density Image 6 Indicated.
Embodiment 3
[0034] Lithium-sulfur battery was prepared following the procedure of Example 1, only the adjustment in step 3 in the sulfur coating amount of the carbon paper current collector surface is 4mg / cm 2 Other steps unchanged. Example 3 A lithium-sulfur battery obtained in 6mA / cm 2 Length of the loop 400 for circulating a constant current charge and discharge at a current density attenuation rate of 0.02% per revolution.
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