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Water-based soy protein-based supramolecular sulfur positive electrode binder and preparation method and application thereof

A technology of soybean protein and sulfur positive electrode, which is applied in the direction of non-aqueous electrolyte battery electrodes, battery electrodes, structural parts, etc., can solve the problems of poor bonding performance and low ion conductivity, achieve strong bonding ability, prevent falling off, and strong The effect of lithium polysulfide adsorption

Active Publication Date: 2020-07-17
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a water-based soybean protein-based supramolecular sulfur cathode binder and its preparation method and application in view of the problems of poor binding performance and low ion conductivity of the existing water-phase biomass sulfur cathode binder

Method used

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  • Water-based soy protein-based supramolecular sulfur positive electrode binder and preparation method and application thereof
  • Water-based soy protein-based supramolecular sulfur positive electrode binder and preparation method and application thereof
  • Water-based soy protein-based supramolecular sulfur positive electrode binder and preparation method and application thereof

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Embodiment 1

[0071] The preparation method of water-based soybean protein-based supramolecular sulfur cathode binder comprises the following steps:

[0072] (1) Take 3 g of soybean protein, disperse it in water, and stir magnetically at 600 r / min for 20 minutes to obtain a uniform mass fraction of 4 wt % soybean protein aqueous solution;

[0073] (2) adding an aqueous sodium hydroxide solution with a mass fraction of 10 wt% to the aqueous solution obtained in step (1), adjusting the pH of the soybean protein aqueous solution to 10.0 to obtain a pH-adjusted solution;

[0074] (3) Under the premise of ensuring that the mol ratio of soybean protein to phosphorus oxychloride is 1:3000, 38.33g of phosphorus oxychloride is dissolved in n-hexane to form an organic solution with a mass fraction of 10wt%, which is added to the step (2) In the obtained solution after pH adjustment, mix uniformly to obtain a mixed solution;

[0075] (4) Add an aqueous sodium hydroxide solution with a mass fraction o...

Embodiment 2

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

[0087] (1) Take 3 g of soybean protein, disperse it in water, and stir magnetically at 600 r / min for 20 minutes to obtain a uniform mass fraction of 6 wt % soybean protein aqueous solution;

[0088] (2) adding a sodium hydroxide aqueous solution with a mass fraction of 10 wt% to the aqueous solution obtained in step (1), adjusting the pH of the soybean protein aqueous solution to 10.5, and obtaining a solution after pH adjustment;

[0089] (3) Under the premise of ensuring that the mol ratio of soybean protein to phosphorus oxychloride is 1:3300, 42.16g of phosphorus oxychloride is dissolved in n-hexane to form an organic solution with a mass fraction of 12wt%, which is added to the step (2) In the obtained solution after pH adjustment, mix uniformly to obtain a mixed solution;

[0090] (4) Add an aqueous sodium hydroxide solution with a mas...

Embodiment 3

[0101] The preparation method of water-based soybean protein-based supramolecular sulfur cathode binder comprises the following steps:

[0102] (1) Take 3 g of soybean protein, disperse it in water, and stir it magnetically for 30 minutes at 600 r / min to obtain a uniform soybean protein aqueous solution with a mass fraction of 8 wt%.

[0103] (2) adding an aqueous sodium hydroxide solution with a mass fraction of 10 wt% to the aqueous solution obtained in step (1), adjusting the pH of the soybean protein aqueous solution to 11.0 to obtain a pH-adjusted solution;

[0104] (3) Under the premise of ensuring that the mol ratio of soybean protein to phosphorus oxychloride is 1:3500, 44.72g of phosphorus oxychloride is dissolved in n-hexane to form an organic solution with a mass fraction of 15wt%, which is added to the step (2) In the obtained solution after pH adjustment, mix uniformly to obtain a mixed solution;

[0105] (4) Adding a sodium hydroxide aqueous solution with a mass...

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Abstract

The invention discloses a water-based soy protein-based supramolecular sulfur positive electrode binder and a preparation method and application thereof. The binder is prepared from phosphorylated soybean protein, a lithium ion transmission promoter and a physical cross-linking agent through a physical blending method. The binder has a three-dimensional network cross-linked structure and the characteristics of the raw materials so that the binder has excellent mechanical properties, high ionic conductivity, strong lithium polysulfide adsorption capacity and certain biodegradability. When the binder is applied to the lithium-sulfur battery, the cycle life, the rate capability and the specific capacity of the battery can be effectively improved. A physical blending preparation method is used, a phosphorylated soybean protein aqueous solution, a lithium ion accelerant aqueous solution and a physical cross-linking agent aqueous solution are directly mixed to obtain the binder which is cross-linked by intermolecular hydrogen bonds and has a three-dimensional network structure, the process conditions are simple, efficient and convenient, and no pollution is caused to the environment whenwater is used as a solvent.

Description

technical field [0001] The invention relates to the technical field of liquid lithium-sulfur batteries, in particular to a water-based soybean protein-based supramolecular sulfur cathode binder and a preparation method and application thereof. Background technique [0002] Although due to its high energy density, long cycle life and high safety, lithium-ion batteries have occupied an absolute dominant position in the booming global personal portable electronics and electric vehicle markets for 20 years since the 1990s. . However, since the theoretical specific capacity of the positive electrode materials commonly used in lithium-ion batteries is much lower than that of negative electrode materials such as graphite and silicon, it is difficult to further increase the energy density of lithium-ion batteries. Because the sulfur element is as high as 1675mA h g -1 Theoretical capacity density and 2567Wh kg -1 The theoretical energy density of lithium-ion batteries is much hig...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M4/13H01M10/052
CPCH01M4/13H01M4/621H01M10/052Y02E60/10
Inventor 王朝阳王银艳王荟邓永红
Owner SOUTH CHINA UNIV OF TECH
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