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

Inactive Publication Date: 2019-07-16
HENAN POLYTECHNIC UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, lithium-sulfur battery is a promising next-generation energy storage device. However, some defects at this stage make it difficult to achieve the highest theoretical energy density, and poor stability also hinders the development of lithium-sulfur battery. further application
For example, the discharge intermediate product of lithium-sulfur batteries is lithium polysulfide, which has a certain solubility in the electrolyte. In addition to causing the loss of battery capacity, it will also cause polysulfides to penetrate the diaphragm and cause a decrease in Coulombic efficiency.
In addition, the poor conductivity of elemental sulfur and the final discharge product lithium sulfide will increase the internal resistance of the battery, reduce the discharge efficiency and the utilization of active sulfur

Method used

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  • Heteroatom-doped porous carbon positive electrode material for lithium-sulfur battery and preparation method of material
  • Heteroatom-doped porous carbon positive electrode material for lithium-sulfur battery and preparation method of material
  • Heteroatom-doped porous carbon positive electrode material for lithium-sulfur battery and preparation method of material

Examples

Experimental program
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Effect test

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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Abstract

The invention discloses a heteroatom-doped porous carbon positive electrode material for a lithium-sulfur battery and a preparation method of the material, and belongs to the technical field of lithium-sulfur battery positive electrode materials. The invention specifically relates to a double-heteroatom-doped porous carbon positive electrode material having high sulfur-loading capacity and capableof effectively inhibiting dissolution of polysulfide. The double-heteroatom-doped porous carbon material is prepared by taking a mixed metal organic framework material as a precursor, and is used asa positive electrode sulfur-loading material for the lithium-sulfur battery. Under the discharge rate of 0.2C, the specific discharge capacity is 1,187.6 mAh/g; and when the discharge rate is increased to 3C, the specific discharge capacity is still kept at 548.1 mAh/g. Charge-discharge cycles are carried out at the rate of 0.5C; and after 200 cycles, the specific capacity is 840 mAh/g, the capacity retention rate is 79.5%, and the coulombic efficiency can still be maintained to be about 98% after long-time charge-discharge testing. The heteroatom-doped porous carbon positive electrode material has relatively high practical application values.

Description

technical field [0001] The invention belongs to the technical field of cathode materials for lithium-sulfur batteries, and in particular relates to a double-heteroatom-doped porous carbon cathode material with high sulfur loading and capable of effectively inhibiting the dissolution of polysulfides and a preparation method thereof. Background technique [0002] The shortage of fossil energy and environmental pollution brought about by the rapid development of global industrialization have become important factors restricting the sustainable development of today's society. Wind energy, water energy, solar energy, nuclear energy, etc. are clean and non-polluting as new energy sources. However, in the actual application process, they are often limited by factors such as geographical location, time, and seasonality, which to a certain extent cause energy utilization. The decline is not conducive to the sustainable use of clean energy. Therefore, storing energy in the form of el...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/052
CPCH01M4/362H01M4/38H01M4/625H01M10/052Y02E60/10
Inventor 董喜燕王锐李海洋臧双全徐虹
Owner HENAN POLYTECHNIC UNIV
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