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Preparation method of a three-dimensional porous carbon airgel material and its application in lithium-sulfur batteries

A carbon aerogel, lithium-sulfur battery technology, which is applied in the preparation/purification of carbon, lithium storage batteries, battery electrodes, etc. problem, to achieve the effect of high degree of graphitization, improved cycle stability, high specific capacity and sulfur loading

Active Publication Date: 2021-09-07
SOUTH CHINA AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A large number of amino groups on the molecular surface of the amino-functionalized carbon airgel material can effectively adsorb soluble polysulfides produced during the charging and discharging process of lithium-sulfur batteries, but the lithium-sulfur batteries prepared by this method have low sulfur loading on the positive electrode, and the utilization of sulfur Low rate, low practical application value

Method used

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  • Preparation method of a three-dimensional porous carbon airgel material and its application in lithium-sulfur batteries
  • Preparation method of a three-dimensional porous carbon airgel material and its application in lithium-sulfur batteries
  • Preparation method of a three-dimensional porous carbon airgel material and its application in lithium-sulfur batteries

Examples

Experimental program
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Effect test

Embodiment 1

[0027] A preparation method for a lithium-sulfur battery cathode material, comprising the steps of:

[0028] (1) Add 1.75 g of melamine and 2.5 mL of triethanolamine to 3.5 mL of 37% formaldehyde aqueous solution and mix evenly, heat in a water bath at 75°C in a single-necked flask and continue to stir until the solution is clear and transparent, then add hydrochloric acid (1mol / L ) to adjust the pH to 3;

[0029] (2) Add 1 g of lignin to 10 mL of distilled water, adjust the pH to 11 with concentrated ammonia water to fully dissolve the lignin, and then adjust the pH to 3 with hydrochloric acid (1mol / L) to precipitate the lignin as nanoparticles;

[0030] (3) Add 0.02 g of hydrophilic silica, 1.5 mL of the solution obtained in step (1) and 0.5 mL of the solution obtained in step (2) to a 20 mL finger bottle and mix well to prepare as the aqueous phase of the Pickering emulsion.

[0031] (4) Slowly add 12 mL of toluene dropwise to 2 mL of the solution obtained in step (3) unde...

Embodiment 2

[0035] The difference between this embodiment and Embodiment 1 is: a lithium-sulfur battery positive electrode material, comprising the following steps:

[0036] (1) Add 1.5 g of melamine and 2.5 mL of triethanolamine to 3.5 mL of 37% formaldehyde aqueous solution and mix well, heat in a water bath at 70°C in a single-necked flask and keep stirring until the solution is clear and transparent, then add hydrochloric acid (1mol / L ) to adjust the pH to 3.

[0037] (2) Add 1 g of lignin to 10 mL of distilled water, add concentrated ammonia solution to adjust the pH to 11, and then add hydrochloric acid (1 mol / L) to adjust the pH to 3.

[0038] (3) Add 0.04 g of hydrophilic silica, 1.5 mL of the solution obtained in step 1 and 0.5 mL of the solution obtained in step 2 into a 20 mL finger bottle and mix well.

[0039] (4) Slowly add 12 mL of toluene dropwise to 2 mL of the solution obtained in step 3 under continuous stirring to prepare an oil-in-water emulsion with an internal phas...

Embodiment 3

[0043] The difference between this embodiment and Embodiment 1 is: a lithium-sulfur battery positive electrode material, comprising the following steps:

[0044] (1) Add 1.25 g of melamine and 2.5 mL of triethanolamine to 3.5 mL of 37% formaldehyde aqueous solution and mix evenly, heat in a water bath at 70°C in a single-necked flask and keep stirring until the solution is clear and transparent, then add hydrochloric acid (1 mol / L) to adjust the pH to 3.

[0045] (2) Add 1.5 g of lignin to 10 mL of distilled water, add concentrated ammonia solution to adjust the pH to 11, and then add hydrochloric acid (1 mol / L) to adjust the pH to 3.

[0046] (3) Add 0.06 g of hydrophilic silica, 1.5 mL of the solution obtained in step 1 and 0.5 mL of the solution obtained in step 2 into a 20 mL finger bottle and mix well.

[0047] (4) Slowly add 13 mL of toluene dropwise to 2 mL of the solution obtained in step 3 under continuous stirring to prepare an oil-in-water emulsion with an interna...

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Abstract

The invention belongs to the technical field of lithium-sulfur batteries, and in particular relates to a preparation method of a three-dimensional porous carbon airgel material, comprising: (1) adding melamine and triethanolamine to an aqueous formaldehyde solution to prepare a melamine-formaldehyde prepolymer; (2) Add lignin into water, first adjust the pH to fully dissolve the lignin, then adjust the pH to precipitate the lignin as nanoparticles; (3) mix the hydrophilic silica with the solution obtained in the first two steps; (4) slowly dissolve the toluene Add to the solution obtained in step 3 to obtain an emulsion and then polymerize into a hard gel, soak in ethanol to replace the inner phase; (5) sinter at high temperature, etch away the silicon dioxide with hydrofluoric acid, and dry it. The process of the invention is simple, the production cost is low, and the prepared carbon airgel material has a three-dimensional network and a multi-level pore structure, and when applied to the positive electrode of a lithium-sulfur battery, it can realize sulfur fixation and catalysis while enhancing the conductivity of sulfur, and realize a high sulfur content. load, can greatly improve the cycle stability, rate performance, and Coulombic efficiency of the positive electrode of lithium-sulfur batteries, and has high practical application value.

Description

technical field [0001] The invention belongs to the technical field of lithium-sulfur batteries, and in particular relates to a preparation method of a three-dimensional porous carbon airgel material and its application in lithium-sulfur batteries. Background technique [0002] In recent years, people have paid more and more attention to energy storage technology, and as its applications expand to mobile phones, camcorders, notebook computers, and even electric vehicles, researchers are more and more specifically studying electrochemical devices. Research and development, in which the development of secondary batteries capable of charging / discharging is the focus, and in order to improve the capacity density and energy efficiency of these batteries, research and development have been conducted on the design of new electrodes and batteries. [0003] Lithium-sulfur battery is considered as a new type of energy storage device due to its high cost performance, high specific ener...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/62
CPCC01B32/05H01M4/625H01M4/628H01M10/052H01M2004/021H01M2004/028Y02E60/10
Inventor 杨宇卢梁美杨卓鸿彭粤海楚状状刘飞李朋松
Owner SOUTH CHINA AGRI UNIV
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