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
CN112010279AActive Publication Date: 2020-12-01SOUTH CHINA AGRI UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SOUTH CHINA AGRI UNIV
Publication Date
2020-12-01

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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.
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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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