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Preparation and application of graphene coated spherical cobalt disulfide composite material

A graphene-coated, cobalt disulfide technology, used in secondary batteries, electrochemical generators, electrical components, etc., can solve problems such as no graphene-coated spherical cobalt disulfide composite materials, and achieve excellent cycle performance , The effect of good reproducibility and high specific capacity

Inactive Publication Date: 2017-04-05
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, there is no relevant patent report on the preparation of graphene-coated spherical cobalt disulfide composite materials by one-step method

Method used

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  • Preparation and application of graphene coated spherical cobalt disulfide composite material
  • Preparation and application of graphene coated spherical cobalt disulfide composite material
  • Preparation and application of graphene coated spherical cobalt disulfide composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A kind of preparation of graphene-coated spherical cobalt disulfide composite material, concrete steps are:

[0021] First, dissolve 0.249 g of cobalt acetate tetrahydrate in 10 ml of deionized water. After the cobalt acetate tetrahydrate is completely dissolved, add the resulting solution into 25 ml of graphene oxide solution, stir for 10 minutes, add 0.121 g of L-cysteine, and stir , then add 10ml of ethylene glycol, after stirring, move the final solution into a 40ml reaction kettle, place it in an oven at 160 degrees Celsius, react for 12 hours, wash the resulting product with water several times, and dry it to obtain a graphene package. Composite material coated with spherical cobalt disulfide.

[0022] The described graphene-coated spherical cobalt disulfide composite material is used for sodium-ion batteries, and the specific steps are as follows:

[0023] According to the mass ratio, cobalt disulfide@graphene: polyvinylidene fluoride: acetylene black = 70:20:10...

Embodiment 2

[0027] A kind of preparation of graphene-coated spherical cobalt disulfide composite material, concrete steps are:

[0028] First, dissolve 0.359 g of cobalt acetate tetrahydrate in 10 ml of deionized water. After the cobalt acetate tetrahydrate is completely dissolved, add the resulting solution into 25 ml of graphene oxide solution, stir for 10 minutes, add 0.221 g of L-cysteine, and stir , then add 10ml of ethylene glycol, after stirring, move the final solution into a 40ml reaction kettle, place it in an oven at 160 degrees Celsius, react for 12 hours, wash the resulting product with water several times, and dry it to obtain a graphene package. Composite material coated with spherical cobalt disulfide.

[0029] The described graphene-coated spherical cobalt disulfide composite material is used for sodium-ion batteries, and the specific steps are as follows:

[0030] According to the mass ratio, cobalt disulfide@graphene: polyvinylidene fluoride: acetylene black = 70:20:10...

Embodiment 3

[0034] A kind of preparation of graphene-coated spherical cobalt disulfide composite material, concrete steps are:

[0035] First, dissolve 0.442 g of cobalt acetate tetrahydrate in 10 ml of deionized water. After the cobalt acetate tetrahydrate is completely dissolved, add the resulting solution into 25 ml of graphene oxide solution, stir for 10 minutes, add 0.381 g of L-cysteine, and stir , then add 10ml of ethylene glycol, after stirring, move the final solution into a 40ml reaction kettle, place it in an oven at 180 degrees Celsius, react for 12 hours, wash the resulting product with water several times, and dry it to obtain a graphene package. Composite material coated with spherical cobalt disulfide.

[0036] The described graphene-coated spherical cobalt disulfide composite material is used for sodium-ion batteries, and the specific steps are as follows:

[0037] According to the mass ratio, cobalt disulfide@graphene: polyvinylidene fluoride: acetylene black = 70:20:10...

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Abstract

The invention relates to the technical field of sodium-ion batteries and particularly relates to preparation and application of a graphene coated spherical cobalt disulfide composite material. The preparation mainly includes the steps of: dissolving 0.2-0.5 g of cobalt acetate tetrahydrate in 5-15 ml of deionized water, and when the cobalt acetate tetrahydrate is dissolved completely, adding the solution to 25 ml of a graphene oxide solution, stirring the mixture for 10 min and adding 0.3-0.6 g of L-cysteine, stirring the mixture, and adding 10 ml of ethylene glycol with stirring, and moving the solution to a 40 ml reaction kettle, performing a reaction in a drying box at 120-180 DEG C for 6-18 h, washing a product with water for 3 times and drying the product to obtain the graphene coated spherical cobalt disulfide composite material. The material, when being used as a negative pole of a sodium-ion battery, is high in specific capacity and cycling stability. The preparation is simple process, is low in cost and has good repeatability.

Description

technical field [0001] The invention relates to the technical field of sodium ion batteries, in particular to the preparation and application of a graphene-coated spherical cobalt disulfide composite material. Background technique [0002] Since the successful development of lithium-ion batteries, lithium-ion batteries have been widely used, but lithium-ion batteries also have some shortcomings, such as lithium only accounts for 0.002% of the earth's crust, which makes the cost of lithium-ion batteries high, Thereby limiting the development and application of lithium-ion batteries. Sodium is very abundant in the earth's crust, and about half of the world's salt contains sodium. Therefore, in terms of development and application, sodium-ion batteries have a wider application prospect than lithium-ion batteries. At present, there are relatively many studies on anode materials for sodium-ion batteries, mainly including carbon-based materials and titanate materials. Carbon-bas...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M4/587H01M10/054
CPCH01M4/366H01M4/5815H01M4/587H01M10/054Y02E60/10
Inventor 魏明灯李志伟
Owner FUZHOU UNIV
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