Composite positive electrode material with array structure, and application thereof

A composite positive electrode material and array structure technology, applied in the direction of structural parts, battery electrodes, electrical components, etc., can solve the problems of unsuitable for large-scale production, unsatisfactory firmness, and low loading capacity, so as to improve the liquid absorption performance and cycle performance , inhibit the shuttle diffusion behavior, and ensure the effect of spatial structure

Pending Publication Date: 2021-09-21
江苏智泰新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In the prior art, the immobilization of elemental sulfur in lithium-sulfur batteries is generally not high or the steps are cumbersome. For example, carbon-coated sulfur nanosheets are synthesized by continuous carbon coating and solution phase oxidation reaction method. When preparing pure zinc sulfide nanosheets Zinc sulfide hybrid nanosheets need to be calcined under high temperature and inert environment
This method has certain requirements on equipment, and the steps are cumbersome and not suitable for large-scale production. In addition, there is a method to mix sublimated sulfur with mesoporous silica, and after secondary calcination, the sulfur element is embedded in the pore diameter by capillary force to obtain silica Sulfur compound, this technical solution completes sulfur fixation through capillary force, but its firmness is still unsatisfactory

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  • Composite positive electrode material with array structure, and application thereof
  • Composite positive electrode material with array structure, and application thereof
  • Composite positive electrode material with array structure, and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0039] This embodiment provides a sulfur-tin oxide-graphene composite positive electrode material, and the specific preparation method includes the following steps:

[0040] Step 1, add 1 part (parts by mass) of thioacetamide and 1 part of tin tetrachloride to 2 parts of isopropanol solvents, ultrasonically dissolve and transfer to a polytetrafluoroethylene reactor, the reactor volume is 2 times the volume of the solution;

[0041] Step 2, 1 part of acetone, 1 part of nitric acid and 5 parts of graphene are added to the mixture obtained in step 1;

[0042] Step 3: React the reactor at 160°C for 24 hours.

[0043] After the reaction is completed, the product is dried in an oven at 80°C for 24 hours to obtain the substrate material precursor;

[0044] Step 4: Calcining the base material precursor at 500°C for 2 hours to obtain the array structure base material;

[0045] Step 5. Add 1 part of sulfur powder and 2 parts of base material to carbon sulfide, let it stand for 12 hou...

Embodiment 2

[0047] This embodiment provides a sulfur-tin oxide-carbon nanotube composite positive electrode material, and the specific preparation method includes the following steps:

[0048] Step 1, adding 1 part of thioacetamide and 1 part of tin tetrachloride to 2 parts of isopropanol solvent, ultrasonically dissolved and transferred to a polytetrafluoroethylene reactor whose volume is 2.3 times the volume of the solution;

[0049] Step 2, adding 1 part of acetone, 1 part of nitric acid and 6 parts of carbon nanotubes into the reactor containing the mixture of step 1;

[0050] Step 3: react the reactor at 170°C for 24 hours; after the reaction is completed, put the product in an oven at 80°C for 24 hours to obtain the substrate material precursor;

[0051] Step 4: Calcining the base material precursor at 500°C for 2 hours to obtain the array structure base material;

[0052] Step 5. Add 1 part of sulfur powder and 3 parts of base material to carbon sulfide, let it stand for 12 hours,...

Embodiment 3

[0054] This embodiment provides a sulfur-tin oxide-carbon nanohorn composite positive electrode material, and the specific preparation method includes the following steps:

[0055] Step 1. Add 1 part of thioacetamide and 1 part of tin tetrachloride to 2 parts of isopropanol solvent, ultrasonically dissolve and transfer to a polytetrafluoroethylene reactor whose volume is 2.7 times the volume of the solution;

[0056] Step 2, adding 1 part of acetone, 1 part of nitric acid and 7 parts of carbon nanohorns into the reactor containing the mixture of step 1;

[0057] Step 3, the reaction kettle was reacted at 180°C for 24 hours;

[0058]After the reaction is completed, the product is dried in an oven at 80°C for 24 hours to obtain the substrate material precursor;

[0059] Step 4: Calcining the base material precursor at 500°C for 2 hours to obtain the array structure base material;

[0060] Step 5. Add 1 part of sulfur powder and 4 parts of base material to carbon sulfide, let i...

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Abstract

The invention discloses a composite positive electrode material with an array structure. The composite positive electrode material comprises sulfur and a substrate material with the array structure, wherein the sulfur is combined with the substrate material through thermal synthesis; the mass ratio of the sulfur to the substrate material is 1: 2 to 1: 4; and the composite material provided by the invention provides rich active adsorption sites for sulfur, is beneficial to inhibiting the shuttle diffusion behavior of lithium polysulfide, and improves the performance of a lithium-sulfur battery.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a composite positive electrode material with an array structure, a preparation method and an application. Background technique [0002] Lithium sulfur battery because of its up to 2600Wh kg -1 The advantages of theoretical energy density, low cost, and environmental friendliness have attracted widespread attention worldwide. However, sulfur is not an ideal material for electrodes. Realizing the real industrial application of lithium-sulfur batteries still faces many challenges, among which the "dissolution shuttle behavior" of the reaction intermediate lithium polysulfide and its slow kinetic conversion process seriously hinder the commercialization process of lithium-sulfur batteries. [0003] In the prior art, the immobilization of elemental sulfur in lithium-sulfur batteries is generally not high or the steps are cumbersome. For example, carbon-coated sulfur na...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/38H01M10/0525C01G19/02
CPCH01M4/628H01M4/625H01M4/38H01M10/0525C01G19/02Y02E60/10
Inventor 李亚辉吴丽军陈亚龙海涛王亚峰
Owner 江苏智泰新能源科技有限公司
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