Heteroatom-doped porous carbon positive electrode material for lithium-sulfur battery and preparation method of material
A cathode material and porous carbon technology, applied in the field of di-heteroatom doped porous carbon cathode materials and their preparation, can solve the problems of reduced discharge efficiency, active sulfur utilization rate, poor stability, high theoretical energy density and the like
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Embodiment 1
[0027] Example 1: Synthesis of Nitrogen and Phosphorus Co-doped Porous Carbon Material for Lithium-Sulfur Battery Anode Sulfur Loading Material
[0028] (1) Dissolve 0.51g of copper nitrate trihydrate, 0.54g of hydroxyethylidene diphosphonic acid ligand and 0.31g of 4,4'-bipyridine ligand in 20mL of water, and then stir 10mL of the aqueous solution containing 0.21g of NaOH While adding to the above mixed solution, adjust the pH value of the solution to 4, and then continue to stir and react for 12 hours. The resulting blue flocculent precipitate was suction-filtered, washed several times with water and ethanol, and vacuum-dried at 60°C to obtain a blue powder sample, which is the NPMOF precursor material. PXRD of the precursor such as figure 1 As shown, NPMOF has strong diffraction peaks, which are almost completely consistent with the PXRD peaks simulated with single crystal data, indicating that the prepared precursors have high crystallinity and purity.
[0029] (2) Fully...
Embodiment 2
[0033] Example 2: Performance test of the S@NPPCF material prepared by the present invention as the positive electrode of lithium-sulfur batteries
[0034] Assembly and testing of lithium-sulfur batteries: Mix S@NPPCF material with conductive carbon and polyvinylidene fluoride at a mass ratio of 7:2:1, drop a small amount of N-methylpyrrolidone and grind it thoroughly to form a slurry , and then evenly coated the prepared active material slurry on the carbon paper pole piece, transferred to an oven at 60° C. and dried for 12 hours to obtain the desired positive pole piece. The pole piece loaded with active material is used as the positive electrode, the lithium sheet is used as the negative electrode, and the commercial Celgard film is used as the diaphragm between the positive and negative electrodes to assemble a button battery in a glove box. The electrolyte used is dissolved in a volume ratio of 1:1. 1,3-dioxolane and ethylene glycol dimethyl ether mixed solvent with a con...
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