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A soybean protein-based three-dimensional network multifunctional sulfur cathode water-based binder and its preparation method and application

A water-based binder and three-dimensional network technology, which is applied in the field of soybean protein-based three-dimensional network multifunctional sulfur cathode water-based binder and its preparation, can solve the problem that it is difficult to inhibit the volume expansion of active substance sulfur and cannot effectively inhibit shuttling Effect, poor bonding performance of sulfur cathode binder, etc., to achieve excellent bonding ability, excellent mechanical strength, and improved bonding strength

Active Publication Date: 2022-03-29
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The purpose of the present invention is to provide a soybean protein-based binder for the problems of poor binding performance of the existing sulfur cathode binder, difficulty in suppressing the volume expansion of the active material sulfur during battery charging and discharging, and inability to suppress the shuttle effect very effectively. Three-dimensional network multifunctional sulfur cathode water-based binder and its preparation method and application

Method used

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  • A soybean protein-based three-dimensional network multifunctional sulfur cathode water-based binder and its preparation method and application
  • A soybean protein-based three-dimensional network multifunctional sulfur cathode water-based binder and its preparation method and application
  • A soybean protein-based three-dimensional network multifunctional sulfur cathode water-based binder and its preparation method and application

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Embodiment 1

[0086] The preparation method of soybean protein-based three-dimensional network multifunctional sulfur cathode water-based binder comprises the following steps:

[0087] (1) Take 1 g of soybean protein isolate, disperse it in water, and stir magnetically at 600 r / min for 5 hours to obtain a uniform mass fraction of 2.5 wt % soybean protein isolate aqueous solution;

[0088] (2) Add 2 g of 3,4-dihydroxybenzoic acid into water, stir for 5 minutes until completely dissolved, and obtain a uniform 20 wt% aqueous solution of 3,4-dihydroxybenzoic acid;

[0089] (3) Pour the aqueous solution of 3,4-dihydroxybenzoic acid described in step (2) into the aqueous solution of soybean protein isolate described in step (1) under stirring, the aqueous solution of soybean protein isolate and 3,4-dihydroxybenzoic acid Benzoic acid aqueous solution volume ratio is 2:1, obtains mixed solution, regulates the pH of this mixed solution to 5.5 simultaneously, obtains the mixed solution after adjustin...

Embodiment 2

[0104] The preparation method of soybean protein-based three-dimensional network multifunctional sulfur cathode water-based binder comprises the following steps:

[0105] (1) Take 1 g of soybean protein isolate, disperse it in water, and stir it magnetically at 600 r / min for 5 hours to obtain a uniform mass fraction of 5 wt % soybean protein isolate aqueous solution;

[0106] (2) Add 1 g of 3,4-dihydroxyphenylpropionic acid into water, stir for 5 minutes until completely dissolved, and obtain a uniform 10wt% 3,4-dihydroxyphenylpropionic acid aqueous solution;

[0107] (3) Pour the 3,4-dihydroxyphenylpropionic acid aqueous solution described in step (2) into the isolated soybean protein aqueous solution described in step (1) under stirring, the isolated soybean protein aqueous solution and 3,4-dihydroxyphenylpropionic acid The hydroxyphenylpropionic acid aqueous solution volume ratio is 2:1, obtains mixed solution, adjusts the pH of this mixed solution to 6.0 simultaneously, ob...

Embodiment 3

[0122] The preparation method of soybean protein-based three-dimensional network multifunctional sulfur cathode water-based binder comprises the following steps:

[0123] (1) Take 1 g of soybean protein isolate, disperse it in water, and stir magnetically at 600 r / min for 5 hours to obtain a uniform mass fraction of 1 wt % soybean protein isolate aqueous solution;

[0124] (2) Add 0.1 g of 3,4-dihydroxyphenylacetic acid into water, stir for 5 minutes until completely dissolved, and obtain a uniform aqueous solution of 3,4-dihydroxyphenylacetic acid with a mass fraction of 1 wt %;

[0125] (3) Pour the aqueous solution of 3,4-dihydroxyphenylacetic acid described in step (2) into the aqueous solution of soybean protein isolate described in step (1) under stirring, the aqueous solution of soybean protein isolate and 3,4-dihydroxyphenylacetic acid The phenylacetic acid aqueous solution volume ratio is 4:1, obtains mixed solution, adjusts the pH of this mixed solution to 6.5 simult...

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Abstract

The invention discloses a soybean protein-based three-dimensional net-shaped multifunctional sulfur cathode water-based binder, a preparation method and an application thereof. The method includes: using soybean protein isolate, organic acid containing catechol groups, and phosphate as basic raw materials, a soybean protein-based three-dimensional network with a three-dimensional network structure is synthesized through two-step reactions of amidation and phosphorylation Multifunctional sulfur cathode water-based binder. The binder has a three-dimensional network cross-linked structure and some of the characteristics of the inherited raw materials make it have strong bond strength, excellent self-healing performance, strong lithium polysulfide adsorption capacity and a certain ability to promote lithium ion transport. . When the binder is applied in a lithium-sulfur battery, the cycle life of the battery can be effectively extended, the rate performance of the battery can be optimized, and the specific capacity of the battery can be improved. Various groups present in the binder prepared by the method simultaneously endow the binder with strong bonding ability, excellent self-healing performance and lithium polysulfide adsorption capacity.

Description

technical field [0001] The invention relates to the technical field of liquid lithium-sulfur batteries, in particular to a soybean protein-based three-dimensional network-shaped multifunctional sulfur cathode water-based binder and its preparation method and application. Background technique [0002] As a typical rechargeable energy storage device, lithium-ion batteries (LIBs) have the advantages of high energy density, long cycle life, and high safety. At present, the cathode materials commonly used in lithium-ion batteries (such as LiCoO 2 、LiFePO 4 etc.) The theoretical specific capacity is much lower than that of negative electrode materials (such as graphite, silicon, etc.), making it difficult to further improve the energy density of lithium-ion batteries. With the increasing energy density requirements of advanced portable electronic products and electric vehicles, it is urgent to explore and develop lithium-ion battery systems with high energy density. [0003] Du...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/62H01M4/13H01M10/052
CPCH01M4/621H01M4/13H01M10/052Y02E60/10
Inventor 王朝阳王银艳倪培龙邓永红
Owner SOUTH CHINA UNIV OF TECH