Preparation method of lithium-sulfur battery modified diaphragm based on nano metal hydroxide-carbon composite material

A carbon composite material, hydroxide technology, applied in nanotechnology, nanotechnology, nanotechnology and other directions for materials and surface science, can solve problems such as limited control ability, achieve improved cycle life, obvious adsorption, reduce The effect of manufacturing cost

Pending Publication Date: 2021-03-19
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The ability of such materials to regulate the conversion and deposition of polysulfides is still limited. Especially under the test conditions of high sulfur loading, it is necessary to promote the electrochemical conversion of polysulfides while adsorbing and confining them, so as to further improve the performance of the battery. performance

Method used

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  • Preparation method of lithium-sulfur battery modified diaphragm based on nano metal hydroxide-carbon composite material
  • Preparation method of lithium-sulfur battery modified diaphragm based on nano metal hydroxide-carbon composite material
  • Preparation method of lithium-sulfur battery modified diaphragm based on nano metal hydroxide-carbon composite material

Examples

Experimental program
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Effect test

Embodiment 1

[0050] A method for preparing a lithium-sulfur battery diaphragm modified by nanometer metal hydroxide, the lithium-sulfur battery diaphragm includes a diaphragm body, one side of the diaphragm body is coated with a modified coating, and the modified coating It contains nickel hydroxide powder, conductive agent SP and binder PVDF; the mass ratio of nickel hydroxide powder, conductive agent SP and binder PVDF is 8:1:1;

[0051] The preparation method steps are as follows:

[0052] (1) Take by weighing 0.24g sodium hydroxide, dissolve sodium hydroxide in 500mL deionized water, the concentration is 0.012mol / L, weigh 0.548g nickel nitrate, put it into a beaker filled with 100mL deionized water, stir until Completely dissolve, gradually add 0.012mol / L sodium hydroxide solution dropwise to the slowly stirring nickel nitrate solution, the reaction finally produces a light green precipitate, collect the precipitate, wash it with deionized water several times, and dry it at 60°C. Obta...

Embodiment 2

[0060] A method for preparing a lithium-sulfur battery diaphragm modified by nanometer metal hydroxide, the lithium-sulfur battery diaphragm includes a diaphragm body, one side of the diaphragm body is coated with a modified coating, and the modified coating It contains nano-nickel hydroxide-graphene composite powder, conductive agent SP and binder PVDF; the mass ratio of nano-nickel hydroxide-graphene composite powder, conductive agent SP and binder PVDF is 8:1: 1;

[0061] The preparation method steps are as follows:

[0062] (1) Measure 8ml of graphene oxide solution with a solid content of 5mg / ml, weigh 1.6g of nickel sulfate hexahydrate and 0.72g of urotropine, put the above materials into a beaker containing 40mL of deionized water, stir After uniformity, the aqueous solution was transferred to the reaction kettle and sealed, and then kept at 95°C for 6 hours to form a black precipitate. The precipitate was collected, washed with deionized water several times, and then ...

Embodiment 3

[0069] A method for preparing a lithium-sulfur battery diaphragm modified by nanometer metal hydroxide, the lithium-sulfur battery diaphragm includes a diaphragm body, one side of the diaphragm body is coated with a modified coating, and the modified coating It contains metal hydroxide composite powder, conductive agent SP and binder PVDF; the mass ratio of nickel hydroxide / manganese hydroxide composite material, conductive agent SP and binder PVDF is 8:1:1;

[0070] The preparation method steps are as follows:

[0071] (1) Weigh 0.570g nickel chloride hexahydrate, 0.119g manganese chloride tetrahydrate, and 0.540g urea, put the three into a beaker filled with 40mL deionized water and stir until completely dissolved, then transfer the aqueous solution to the reaction The kettle was sealed, and then kept at 80°C for 12 hours to produce a black precipitate. The precipitate was collected, washed with deionized water for several times, and then freeze-dried to obtain a nano-nickel...

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Abstract

The invention relates to a preparation method of alithium-sulfur battery modified diaphragm based on a nano metal hydroxide carbon composite material. The nano metal hydroxide or the nano metal hydroxide and carbon matrix composite material is used as a barrier layer of lithium polysulfide to form the lithium-sulfur battery modified diaphragm on a traditional diaphragm, and the lithium polysulfideproduced by the positive electrode is blocked and adsorbed. The nano metal hydroxide or the nano metal hydroxide and carbon matrix composite material has a high specific surface area, and can effectively adsorb soluble polysulfide and inhibit the polysulfide from diffusing to the negative electrode, and the surface of the nano metal hydroxide or the nano metal hydroxide and carbon matrix composite material contains a large amount of hydrophilic surface hydroxyl compounds and polysulfide anions. The nano metal hydroxide or the nano metal hydroxide and carbon matrix composite material has goodphysical and chemical stability and can effectively inhibit the dissolution and leakage of the polysulfide.

Description

technical field [0001] The invention relates to a preparation method of a modified diaphragm for lithium-sulfur batteries based on a nanometer metal hydroxide-carbon composite material, and belongs to the technical field of battery diaphragms. Background technique [0002] Lithium-sulfur batteries use sulfur and metallic lithium as the positive and negative active materials of the battery. Its theoretical specific capacity is large (1675mAh / g). Lithium-sulfur batteries have the advantages of light weight, large capacity, environmental friendliness, and easy availability of raw materials. Lithium-sulfur battery is a kind of secondary battery with great application prospect. [0003] Although lithium-sulfur batteries have the great advantage of high energy density, there are also some problems to be solved urgently in lithium-sulfur batteries, the most prominent of which is the shuttle effect of soluble polysulfides. Lithium-sulfur batteries are currently commonly used ether ...

Claims

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Application Information

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IPC IPC(8): H01M50/403H01M50/449B82Y30/00
CPCB82Y30/00Y02E60/10
Inventor 侯士峰胡成赵长锋
Owner SHANDONG UNIV
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