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Soybean protein-based double-crosslinking self-healing supermolecular sulfur positive electrode aqueous binder, and preparation method and application thereof

A water-based binder, soybean protein technology, applied in positive electrodes, battery electrodes, structural parts, etc., can solve the problems of limiting the volume expansion of active material sulfur, poor bonding performance, etc., to prevent shedding, ensure electron conduction, and effectively The effect of electron conduction

Active Publication Date: 2020-09-18
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to provide a soy protein-based double-crosslinked self-adhesive solution for the problems of poor binding performance of the existing water-phase biomass sulfur cathode binder and difficulty in limiting the volume expansion of the active material sulfur during battery charging and discharging. Healing supramolecular sulfur cathode water-based binder and its preparation method and application

Method used

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  • Soybean protein-based double-crosslinking self-healing supermolecular sulfur positive electrode aqueous binder, and preparation method and application thereof
  • Soybean protein-based double-crosslinking self-healing supermolecular sulfur positive electrode aqueous binder, and preparation method and application thereof
  • Soybean protein-based double-crosslinking self-healing supermolecular sulfur positive electrode aqueous binder, and preparation method and application thereof

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Effect test

Embodiment 1

[0068] The preparation method of soybean protein-based double cross-linking self-healing supramolecular sulfur cathode water-based binder comprises the following steps:

[0069] (1) Take 10 g of soybean protein powder, disperse it in water, and stir it magnetically at 600 r / min for 5 hours to obtain a uniform soybean protein aqueous solution with a mass fraction of 10 wt%.

[0070] (2) Add an aqueous sodium hydroxide solution with a mass fraction of 10 wt% to the aqueous solution obtained in step (1), adjust the pH of the aqueous soybean protein solution to 10.0, and obtain a pH-adjusted solution;

[0071] (3) Heating the pH-adjusted solution in step (2) to 70 ºC, stirring and hydrolyzing for 40 minutes, then cooling to room temperature, and then continuing to stir and react for 10 hours to obtain a hydrolyzed soybean protein aqueous solution;

[0072] (4) After centrifuging the hydrolyzed soybean protein aqueous solution obtained in step (3) at a speed of 8000 r / min for 10 mi...

Embodiment 2

[0085] The preparation method of soybean protein-based double cross-linking self-healing supramolecular sulfur cathode water-based binder comprises the following steps:

[0086] (1) Take 10 g of soybean protein powder, disperse it in water, and magnetically stir it at 600 r / min for 10 hours to obtain a uniform soybean protein aqueous solution with a mass fraction of 5 wt%.

[0087] (2) Add an aqueous sodium hydroxide solution with a mass fraction of 10 wt% to the aqueous solution obtained in step (1), adjust the pH of the aqueous soybean protein solution to 11.0, and obtain a pH-adjusted solution;

[0088] (3) Heating the pH-adjusted solution in step (2) to 80 ºC, stirring and hydrolyzing for 30 minutes, then cooling to room temperature, and then continuing to stir and react for 12 hours to obtain a hydrolyzed soybean protein aqueous solution;

[0089] (4) After centrifuging the hydrolyzed soybean protein aqueous solution obtained in step (3) at a speed of 8000 r / min for 10 mi...

Embodiment 3

[0102] The preparation method of soybean protein-based double cross-linking self-healing supramolecular sulfur cathode water-based binder comprises the following steps:

[0103] (1) Take 10 g of soybean protein powder, disperse it in water, and stir it magnetically at 600 r / min for 12 hours to obtain a uniform soybean protein aqueous solution with a mass fraction of 8 wt%.

[0104] (2) Add an aqueous sodium hydroxide solution with a mass fraction of 10 wt% to the aqueous solution obtained in step (1), adjust the pH of the aqueous soybean protein solution to 10.5, and obtain a pH-adjusted solution;

[0105] (3) Heating the pH-adjusted solution in step (2) to 90 ºC, stirring and hydrolyzing for 20 minutes, then cooling to room temperature, and then continuing to stir and react for 11 hours to obtain a hydrolyzed soybean protein aqueous solution;

[0106] (4) After centrifuging the hydrolyzed soybean protein aqueous solution obtained in step (3) at a speed of 8000 r / min for 10 mi...

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Abstract

The invention discloses a soybean protein-based double-crosslinking self-healing supermolecular sulfur positive electrode water-based binder and a preparation method and application thereof. The binder is prepared from hydrolyzed soy protein, a small molecular cross-linking agent and a copolymer monomer through a free radical copolymerization method. The binder has a three-dimensional network cross-linked structure and the characteristics of raw materials, so the binder has strong bonding strength, excellent self-repairing performances, strong lithium polysulfide adsorption capacity and biodegradability. When the binder is applied to the lithium-sulfur battery, the cycle life of the battery can be effectively prolonged, the rate capability of the battery is optimized, and the specific capacity of the battery is improved. A free radical copolymerization method is used, hydrolyzed soy protein and a copolymer are connected in a physical crosslinking mode through chemical crosslinking of asmall molecular crosslinking agent and hydrogen bonds existing between the hydrolyzed soy protein and the copolymer, and the binder with a three-dimensional network structure is obtained. The binderprepared by the method is endowed with strong adhesive capacity and self-healing performance due to the double cross-linking effect in the binder.

Description

technical field [0001] The invention relates to the technical field of liquid lithium-sulfur batteries, in particular to a soybean protein-based double-crosslinked self-healing supramolecular sulfur cathode water-based binder and its preparation method and application. Background technique [0002] Due to the rapid growth of people's demand for distributed energy storage and electric vehicles, the existing lithium-ion batteries based on the principle of intercalation chemistry can no longer meet the requirements of these devices for low energy storage cost, high energy density and long cycle life. Urgent need. In the research and development of next-generation energy storage technologies, lithium-sulfur batteries based on multi-electron conversion reactions and light element sulfur have received great attention. Its active material has an ultra-high theoretical specific capacity, among which lithium is 3800 mAh g -1 , sulfur is 1672 mAh g -1 , after being assembled into a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/38H01M10/052C08F289/00C08F220/54C08F220/56C08H1/00
CPCC08F289/00C08H1/00H01M4/38H01M4/622H01M4/625H01M10/052H01M2004/028C08F220/54C08F220/56Y02E60/10
Inventor 王朝阳王银艳王荟邓永红
Owner SOUTH CHINA UNIV OF TECH
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