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Preparation method of three-dimensional porous carbon aerogel material and application of three-dimensional porous carbon aerogel material in lithium-sulfur battery

A carbon aerogel and lithium-sulfur battery technology, which is applied in the preparation/purification of carbon, lithium batteries, battery electrodes, etc., can solve the problems of low application value, low sulfur load on the positive electrode of lithium-sulfur batteries, and low sulfur utilization rate, etc. problems, to achieve high degree of graphitization, improve cycle stability, high specific capacity and sulfur loading effect

Active Publication Date: 2020-12-01
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 three-dimensional porous carbon aerogel material and application of three-dimensional porous carbon aerogel material in lithium-sulfur battery
  • Preparation method of three-dimensional porous carbon aerogel material and application of three-dimensional porous carbon aerogel material in lithium-sulfur battery
  • Preparation method of three-dimensional porous carbon aerogel material and application of three-dimensional porous carbon aerogel material in lithium-sulfur battery

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Experimental program
Comparison scheme
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 well, heat in a water bath at 75 °C in a single-necked flask and keep stirring until the solution is clear and transparent, then add hydrochloric acid (1 mol / L) adjusting 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) under c...

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 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) 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 (1mol / L) 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 internal ph...

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Abstract

The invention belongs to the technical field of lithium-sulfur batteries, and particularly relates to a preparation method of a three-dimensional porous carbon aerogel material. The preparation methodcomprises the following steps: (1) adding melamine and triethanolamine into a formaldehyde aqueous solution to prepare a melamine-formaldehyde prepolymer, (2) adding lignin into water, firstly adjusting the pH value to fully dissolve the lignin, and then adjusting the pH value to separate out the lignin in the form of nanoparticles, (3) uniformly mixing hydrophilic silicon dioxide with the solutions obtained in the previous two steps, (4) slowly adding methylbenzene into the solution obtained in the step (3) to obtain emulsion, polymerizing the emulsion into hard gel, and soaking the hard gelin ethanol to replace an inner phase, and (5) sintering at high temperature, etching off silicon dioxide by using hydrofluoric acid, and drying. The method is simple, the production cost is low, andthe prepared carbon aerogel material has a three-dimensional network and a hierarchical pore structure, is applied to a lithium-sulfur battery positive electrode, can realize sulfur fixation and catalytic action while enhancing sulfur conductivity, realizes high sulfur load, can greatly improve the cycling stability, rate capability and coulombic efficiency of the lithium-sulfur battery positive electrode, and has relatively 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 Applications(China)
IPC IPC(8): C01B32/05H01M4/62H01M10/052
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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