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Preparation method of lithium-sulfur battery cathode composite material

A lithium-sulfur battery and composite material technology, applied in battery electrodes, positive electrodes, secondary batteries, etc., can solve the problems of high price and high raw material cost, and achieve the effect of reducing raw material cost, abundant sources, and reducing sulfur loss.

Active Publication Date: 2019-12-03
JIANGHAN UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The above method uses Ketjen black to coat the surface of the positive electrode material. Due to the high price of Ketjen black, the raw material cost of this preparation method is relatively high. At the same time, it is necessary to further alleviate the shuttle effect of polysulfide ions

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  • Preparation method of lithium-sulfur battery cathode composite material

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preparation example Construction

[0027] An embodiment of the present invention provides a preparation method of a lithium-sulfur battery cathode composite material, the preparation method comprising:

[0028] Mix clay minerals with acid solution and carry out etching reaction to obtain etching products;

[0029] loading transition metal ions on the etching product to obtain a product loaded with transition metal ions;

[0030] Mix and react sodium sulfide solution or ammonium sulfide solution with the transition metal ion product to obtain a sulfide surface-modified solid; when it is realized, calculate the S required for the reaction to form sulfide 2- The amount is prepared into a solution with sodium sulfide or ammonium sulfide, and the mass of the solution is 2 to 5 times the mass of the product loaded with transition metal ions.

[0031] mixing the sulfide surface-modified solid with an organic carbon source solution and then drying to obtain a dry product;

[0032] The dry product is heat-treated in a...

Embodiment 1

[0049] An embodiment of the present invention provides a preparation method of a lithium-sulfur battery cathode composite material, the preparation method comprising:

[0050] After mixing rectorite with hydrochloric acid with a concentration of 2 mol / L, stirring at 80° C. for 1 h for etching reaction to obtain etching products; wherein, the mass ratio of hydrochloric acid to rectorite is 2:1.

[0051] The obtained etching product was dried at 120° C. for 6 h after being washed and filtered.

[0052] The dry etching product is loaded with transition metal ions by an impregnation method of equal volume cobalt sulfide (soluble salt) to obtain a product loaded with transition metal ions; the mass ratio of cobalt sulfide to etching product is 1:20.

[0053] After the product loaded with transition metal ions was air-dried naturally, it was vacuum-dried at 80°C.

[0054] Mix the sodium sulfide solution with the transition metal ion product and fully mix and react at 40°C for 4 hou...

Embodiment 2

[0062] An embodiment of the present invention provides a preparation method of a lithium-sulfur battery cathode composite material, the preparation method comprising:

[0063] After mixing montmorillonite with nitric acid with a concentration of 2 mol / L, stirring at 50° C. for 3 h for etching reaction to obtain an etching product; wherein, the mass ratio of nitric acid to montmorillonite is 6:1.

[0064] The obtained etching product was dried at 120° C. for 6 h after being washed and filtered.

[0065] The dry etching product is loaded with transition metal ions by an equal volume manganese sulfide (soluble salt) impregnation method to obtain a loaded transition metal ion product; the mass ratio of cobalt sulfide to the etching product is 1:10.

[0066] After the product loaded with transition metal ions was air-dried naturally, it was vacuum-dried at 80°C.

[0067] Mix the sodium sulfide solution with the loaded transition metal ion product and fully mix and react at 50°C fo...

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Abstract

The invention discloses a preparation method of a lithium-sulfur battery cathode composite material. The preparation method comprises the following steps of: mixing clay minerals with an acid solution, and performing an etching reaction to obtain an etching product; loading transition metal ions on the etching product to obtain a loaded transition metal ion product; reacting a sodium sulfide solution or an ammonium sulfide solution with the loaded transition metal ion product to obtain a sulfide surface modified solid; mixing the sulfide surface modified solid with an organic carbon source solution, and performing drying to obtain a dried product; carrying out heat treatment on the dried product in nitrogen to obtain a carbon-coated solid; mixing the carbon-coated solid with a carbon disulfide solution of sulfur, and carrying out hydrothermal reaction to obtain a sulfur-loaded solid; mixing the sulfur-loaded solid with a water-soluble aluminum salt solution to obtain a mixture; and adding an ammonium fluoride solution into the mixture. According to the method, the surface-modified clay mineral is used as a host material of sulfur particles after being coated with carbon, the clay mineral is cheap and easy to obtain, and the raw material cost of the lithium-sulfur battery cathode composite material can be remarkably reduced.

Description

technical field [0001] The invention relates to the field of lithium-sulfur batteries, in particular to a method for preparing a lithium-sulfur battery cathode composite material. Background technique [0002] Lithium-sulfur batteries have attracted increasing attention. A lithium-sulfur battery is a lithium battery that uses sulfur as the positive electrode material of the battery and metallic lithium as the negative electrode material. Elemental sulfur is abundant in the earth and has the characteristics of low price and environmental friendliness. [0003] In lithium-sulfur batteries, the intermediate polysulfide ions, which are easily soluble in the electrolyte, can migrate between the positive and negative electrodes, forming a shuttle effect, which will lead to the loss of active materials and the waste of electric energy. In order to avoid the occurrence of the shuttle effect, there is a method for preparing the positive electrode material of lithium-sulfur batterie...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/38H01M10/0525
CPCH01M4/38H01M4/628H01M10/0525H01M2004/028Y02E60/10
Inventor 余国贤罗贤盛王哲赵金卫吴宏观
Owner JIANGHAN UNIVERSITY
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