Electrode with biopolymer coating and preparation method thereof

A biopolymer and electrode technology, which is applied in the direction of electrode manufacturing, battery electrodes, electrode collector coating, etc., can solve the problems of complex preparation process and unsuitability for large-scale production, and achieve convenient preparation and inhibit the growth of dendrites , to reduce the effect of exposure

Pending Publication Date: 2021-03-26
YANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Xia et al. developed a technology to spontaneously reduce graphene oxide on zinc anode to form a self-assembled film. This graphene film improves battery life by alleviating dendrite growth, but its preparation process is slightly complicated and not suitable for

Method used

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  • Electrode with biopolymer coating and preparation method thereof
  • Electrode with biopolymer coating and preparation method thereof
  • Electrode with biopolymer coating and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0043] The flow chart of the preparation method of the electrode of the biopolymer coating of the present invention is figure 1 As shown, three steps of forming film solutions and inducing crystals are mainly included.

[0044] Biological polymer coatings can effectively reduce the corrosion and passivation of electrolytes to electrodes and inhibit dendrites. figure 2 As shown, the formation of the zinc electrode in the coated zinc electrode is difficult to avoid in the water-based electrolyte, since the newly deposited zinc ions are more biased to the initial nucleation position to minimize the surface energy. And dissolved in the water electrolyte fluid 2 And free water can also cause corrosion and side reactions. The biopolymer material coating can form a diffusion layer on the surface of the zinc electrode, and the functional group of the polymer is adjusted to the zinc ion coordination, and the zinc ions are uniformly deposited on the surface of the electrode.

Example Embodiment

[0045] Example 1

[0046] (1) 2 g of polyvinyl alcohol (PVA) was dispersed in 20 mL of deionized water, and stirred vigorously at 85 ° C for 1 h, naturally cooled to room temperature to give a PVA gel.

[0047] (2) Willine silk protein, PVA gel and Znso 4 According to the mass ratio of 8: 1: 1, it is mixed in aqueous ethanol solution, and the mass ratio of the solute and the solvent is 5% to obtain a film forming liquid.

[0048] (3) Uniformly drop the film-forming liquid on the Zn sheet, naturally dry.

[0049] (4) Soak the coating in a water solution of 75% ethanol, in which the secondary structural transition of the silk fibroin protein can obtain a zinc negative electrode having a polymer coating.

[0050] The resulting silk-like protein coated zinc is extremely image 3 However, the direct topography of the product can directly observe the clear coating structure on the electrode.

Example Embodiment

[0051] Example 2

[0052] (1) The gelatin powder was dissolved in deionized water at a concentration of 15 wt%, and then stirred at 50 ° C for 30 minutes. After removing the bubbles by ultrasonic treatment, the gelatin solution was poured into the mold and allowed to stand at 4 ° C for 1 h to give gelatin gel.

[0053] (2) Hemoglobin, gelatin gel and ZnCl 2 The mass ratio of 7: 2: 1 is mixed in deionized water, and the mass ratio of the solute and the solvent is 50% to obtain a film forming liquid.

[0054] (3) Use a brush to make the film forming liquid on the Zn sheet, naturally dry.

[0055] (4) Use the temperature box to quickly cool the sample, down from 293K to 283K, and induce protein crystallization. Finally, the zinc negative electrode having a polymer coating is obtained.

[0056] The above product is used as the positive and negative electrode of the battery, glass fiber as a diaphragm, 2M ZnCl 2 The solution is used as the electrolyte, and the battery shell is used as ...

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Abstract

The invention discloses an electrode with a biopolymer coating and a preparation method of the electrode. According to the method, a film forming solution prepared by dissolving biopolymer, gel and zinc salt in a solvent is used for uniformly coating an electrode, and then a crystallization method is used for inducing a coating material to crystallize, so that the electrode with a uniform biopolymer coating is obtained. The contact between water and oxygen in the aqueous battery and the electrode is reduced through the hydrophobic group of the biopolymer, and the corrosion and passivation of the electrolyte to the electrode are effectively reduced. And the biopolymer coating can increase the nucleation barrier, effectively inhibit the growth of zinc dendrites, improve the cycle performanceof the aqueous zinc battery and prolong the service life of the aqueous zinc battery.

Description

technical field [0001] The invention belongs to the field of zinc batteries, and relates to an electrode with a biopolymer coating and a preparation method thereof. Background technique [0002] The aqueous electrolyte does not have the inherent flammability of the organic electrolyte system, and the ionic conductivity of the aqueous electrolyte is 2 orders of magnitude higher than that of the organic electrolyte, and the current exchange density and the ion migration velocity in the solution are relatively large, which makes the aqueous battery The resistance is smaller and has greater power density. In addition, since the production environment does not require anhydrous operation, the overall cost is low. The application of aqueous electrolyte instead of organic electrolyte in the field of energy storage is expected to reduce costs, increase power density, and improve safety performance. [0003] The ions embedded in the existing aqueous batteries mainly include lithium...

Claims

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Application Information

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IPC IPC(8): H01M4/04H01M4/62H01M10/36
CPCH01M4/04H01M4/0404H01M4/628H01M10/36Y02E60/10
Inventor 王赪胤卢嘉慧王天奕杨剑李家宝褚子豪庄思东陈鹏
Owner YANGZHOU UNIV
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