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A kind of lithium-sulfur battery composite cathode material and preparation method thereof

A composite cathode material, lithium-sulfur battery technology, applied in battery electrodes, lithium storage batteries, positive electrodes and other directions, can solve the problems of poor interaction, limited improvement effect, affecting the electrochemical performance of cathode materials, etc., to achieve high specific capacity, good Effect of Rate Capability and Cycling Capability

Active Publication Date: 2021-07-02
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the introduction of other materials has a certain improvement effect on the sulfur cathode, the sulfur loading method greatly limits its improvement effect, because the traditional sulfur loading method is to heat and dissolve elemental sulfur in the interaction with carbon materials.
The composite obtained by loading sulfur by heating has poor interaction between carbon and sulfur, and is easy to form large elemental sulfur crystals, which greatly affects the electrochemical performance of positive electrode materials.

Method used

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  • A kind of lithium-sulfur battery composite cathode material and preparation method thereof
  • A kind of lithium-sulfur battery composite cathode material and preparation method thereof
  • A kind of lithium-sulfur battery composite cathode material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0044] (1) Preparation of sulfur-containing reducing precursor solution (HH / S): Add 0.5 g of elemental sulfur to the mixed liquid of 1 mL of hydrazine hydrate and 1 mL of DMF, and stir magnetically for 30 minutes to obtain a brown transparent solution;

[0045] (2) Preparation of oxidative nanoparticle dispersion: 50 mgST and 50 mgSG were added to distilled water and sonicated for 2 h, then 3 mL (30%) hydrogen peroxide was added to the dispersion and stirred for 10 min to obtain an oxidative nanoparticle dispersion;

[0046] (3) Preparation of elemental sulfur composite material: under high-speed stirring, add HH / S dropwise to the oxidizing nanoparticle dispersion obtained in step (2), and stir for 1 min after adding HH / S; then, centrifuge The final sample was obtained, washed three times with distilled water, and finally freeze-dried to obtain the positive electrode composite material SG / ST / S-1:1.

Embodiment 2

[0048] (1) Preparation of sulfur-containing reducing precursor solution (HH / S): Add 0.5 g of elemental sulfur to the mixed liquid of 1 mL of hydrazine hydrate and 1 mL of DMF, and stir magnetically for 30 minutes to obtain a brown transparent solution;

[0049] (2) Preparation of oxidative nanoparticle dispersion: 66.6mgST and 33.3mgSG were added to distilled water and ultrasonically treated for 2h, then 3mL (30%) hydrogen peroxide was added to the dispersion and stirred for 10min to obtain oxidative nanoparticle dispersion ;

[0050] (3) Preparation of elemental sulfur composite material: under high-speed stirring, add HH / S dropwise to the oxidizing nanoparticle dispersion obtained in step (2), and stir for 1 min after adding HH / S; then, centrifuge The final sample was obtained, washed three times with distilled water, and finally freeze-dried to obtain the positive electrode composite material SG@ST / S-1:2.

Embodiment 3

[0052] (1) Preparation of sulfur-containing reducing precursor solution (HH / S): Add 0.5 g of elemental sulfur to the mixed liquid of 1 mL of hydrazine hydrate and 1 mL of DMF, and stir magnetically for 30 minutes to obtain a brown transparent solution;

[0053] (2) Preparation of oxidative nanoparticle dispersion: 75mgST and 25mgSG were added to distilled water and sonicated for 2h, then 3mL (30%) hydrogen peroxide was added to the dispersion and stirred for 10min to obtain oxidative nanoparticle dispersion;

[0054] (3) Preparation of elemental sulfur composite material: under high-speed stirring, add HH / S dropwise to the oxidizing nanoparticle dispersion obtained in step (2), and stir for 1 min after adding HH / S; then, centrifuge The final sample was obtained, washed three times with distilled water, and finally freeze-dried to obtain the positive electrode composite material SG / ST / S-1:3.

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Abstract

The invention relates to a preparation method of a novel lithium-sulfur battery cathode material, belonging to the field of functional composite materials. A method for preparing a lithium-sulfur battery composite positive electrode material, the preparation method comprising: preparing a uniform oxidizing nanoparticle dispersion from nanoparticles 1, 2 and an oxidizing agent; reducing the oxidizing nanoparticle dispersion to sulfur-containing Stirring reaction of the active precursor solution makes the sulfur-containing reducing precursor solution oxidized by the oxygen-containing functional groups in the oxidative nanoparticle dispersion liquid to precipitate elemental sulfur in situ, and the obtained elemental sulfur is first recombined with nanoparticle 1, and then recombined with nanoparticle 2, Thus, the elemental sulfur is stably encapsulated by the nanoparticle 1 and the nanoparticle 2; the lithium-sulfur battery composite cathode material is obtained through centrifugation, washing and freeze-drying. In the microstructure of the material obtained in the present invention, the elemental sulfur is well encapsulated in the spherical shell formed by graphene, and forms an egg yolk shell structure, which can buffer the volume change during charging and discharging.

Description

technical field [0001] The invention relates to a preparation method of a novel lithium-sulfur battery cathode material, belonging to the field of functional composite materials. Background technique [0002] With the continuous development of human society, the contradiction between people's normal life and energy issues is becoming more and more intense. In order to solve the energy problem, the utilization of new energy and the storage of energy have attracted more and more attention. The most common device for storing energy is a battery. There are many commercialized batteries today, which are used in different scenarios according to their own properties. As a rising star among them, lithium batteries are widely used in portable devices and energy vehicles due to their high energy density and safety performance. But now, it is gradually unable to meet the rapid development of the mobile portable era. Commercial lithium batteries generally use lithium iron phosphate,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/62H01M4/38H01M10/052B82Y30/00
CPCB82Y30/00H01M4/38H01M4/628H01M10/052H01M2004/021H01M2004/028Y02E60/10
Inventor 杨伟喻鹏查湘军孙小蓉包睿莹杨鸣波
Owner SICHUAN UNIV