A kind of natural water-based sulfur positive electrode binder and its preparation method and its application in the preparation of lithium-sulfur battery sulfur positive electrode

A lithium-sulfur battery and sulfur cathode technology, applied in non-aqueous electrolyte battery electrodes, battery electrodes, lithium batteries, etc., can solve the problems of high pollution, poor polysulfide affinity, poor mechanical properties, etc., and meet low equipment requirements. , the effect of improving cycle stability and low cost

Active Publication Date: 2021-10-22
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a natural water-based sulfur cathode binder and its preparation method for the problems of poor mechanical properties, poor affinity for polysulfides, and high pollution during use of the currently used lithium-sulfur battery binder. and its application in the preparation of sulfur positive electrodes for lithium-sulfur batteries

Method used

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  • A kind of natural water-based sulfur positive electrode binder and its preparation method and its application in the preparation of lithium-sulfur battery sulfur positive electrode
  • A kind of natural water-based sulfur positive electrode binder and its preparation method and its application in the preparation of lithium-sulfur battery sulfur positive electrode
  • A kind of natural water-based sulfur positive electrode binder and its preparation method and its application in the preparation of lithium-sulfur battery sulfur positive electrode

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Embodiment 1

[0041] A preparation method of natural water-based sulfur cathode binder, comprising the following steps:

[0042] (1) Cut the natural silkworm cocoons into small pieces, sonicate them with deionized water and absolute ethanol for 20 minutes, and then dry them at 60°C for later use to obtain the pretreated silkworm cocoons;

[0043] (2) Disperse the pretreated cocoons in step (1) in ultrapure water, the mass ratio of cocoons to water is 1:80, heat for 2 h at 95°C, during the heating period, every 10 min Fully stir the solution with a glass rod;

[0044] (3) After the solution obtained in step (2) is cooled, use gauze (pore size 80 mesh) to filter out large insoluble impurities, and then perform centrifugation. The speed of the centrifuge is 9000 r / min, centrifuge twice , and centrifuged for 3 min each time to remove suspended small particle impurities and obtain a clear and transparent supernatant;

[0045] (4) Selecting a dialysis bag with a molecular weight cut-off of 10,0...

Embodiment 2

[0052] A preparation method of natural water-based sulfur cathode binder, comprising the following steps:

[0053] (1) Cut the natural silkworm cocoons into pieces, ultrasonicate them with deionized water and absolute ethanol for 25 minutes, and then dry them at 60°C for later use to obtain the pretreated silkworm cocoons;

[0054] (2) Disperse the silkworm cocoons pretreated in step (1) in ultrapure water, the mass ratio of silkworm cocoons to water is 1:150, heat for 4 hours at 90°C, and use a glass rod every 15 minutes Thoroughly stir the solution;

[0055] (3) After the solution obtained in step (2) is cooled, use gauze (pore size of 100 mesh) to filter out large insoluble impurities, and then perform centrifugation. The speed of the centrifuge is 7000 r / min, centrifuge 3 times , and centrifuged for 2 min each time to remove suspended small particle impurities and obtain a clear and transparent supernatant;

[0056] (4) Select a dialysis bag with a molecular weight cut-o...

Embodiment 3

[0063] A preparation method of natural water-based sulfur cathode binder, comprising the following steps:

[0064] (1) Cut the natural silkworm cocoons into pieces, ultrasonicate them with deionized water and absolute ethanol for 30 minutes, and then dry them at 60°C for later use to obtain the pretreated silkworm cocoons;

[0065] (2) Disperse the pretreated cocoons in step (1) in ultrapure water, the mass ratio of cocoons to water is 1:120, heat for 3 hours at 85°C, during the heating period, every 20 minutes Fully stir the solution with a glass rod;

[0066] (3) After the solution obtained in step (2) is cooled, use gauze (pore size: 120 mesh) to filter out large insoluble impurities, and then perform centrifugation. The speed of the centrifuge is 10,000 r / min, centrifuge twice , and centrifuged for 1 min each time to remove suspended small particle impurities and obtain a clear and transparent supernatant;

[0067] (4) Select a dialysis bag with a molecular weight cut-of...

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Abstract

The invention discloses a natural water-based sulfur positive electrode binder, a preparation method thereof and an application in preparing the sulfur positive electrode of a lithium-sulfur battery. The method comprises: cutting silkworm cocoons into pieces, washing, drying, dispersing in water, and heat treatment to obtain a mixed solution; filtering with gauze, taking the filtrate, and centrifuging to obtain a supernatant; performing dialysis treatment on the supernatant, freeze-drying to obtain The natural water-based sulfur cathode binder. The main chemical component of the adhesive is water-soluble sericin, which is extracted from silkworm cocoons. The binder is rich in various polar functional groups such as hydroxyl and amino groups, which can inhibit the "shuttle effect" of lithium-sulfur batteries and improve the cycle stability of batteries; it has excellent mechanical properties and can improve the performance of sulfur cathodes in the battery cycle process Structural stability, and suitable for high-load lithium-sulfur batteries. The invention obtains the water-soluble sulfur positive electrode binder directly from silkworm cocoons by hydrothermal method, has simple process, is green and environment-friendly, has wide sources of raw materials, and is low in cost, and is suitable for large-scale production.

Description

technical field [0001] The invention relates to the technical field of lithium-sulfur batteries, in particular to a natural water-based sulfur positive electrode binder, a preparation method thereof, and an application in the preparation of lithium-sulfur battery sulfur positive electrodes. Background technique [0002] Lithium-sulfur batteries rely on their low mass density (Li: 0.534 g cm -3 ; S: 2.07 g cm −3 ), high theoretical capacity (Li: 3860 mA h g −1 ;S: 1675 mA h g −1 ) stand out from many energy storage devices and have received extensive attention in recent years. The theoretical capacity of lithium-sulfur batteries is much higher than that of currently used lithium-ion batteries based on nickel-cobalt lithium manganese oxide positive electrodes and graphite negative electrodes, so they are considered to be the most promising new generation energy storage devices. However, there are still many problems in lithium-sulfur batteries, among which the "shuttle eff...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/62H01M4/04H01M4/13H01M4/139H01M10/052
CPCH01M4/0404H01M4/13H01M4/139H01M4/621H01M10/052Y02E60/10
Inventor 王朝阳安亚楠常建邓永红
Owner SOUTH CHINA UNIV OF TECH
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