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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 large-scale Production (Xia A, Pu X, Tao Y, et al.Graphene oxide spontaneous reduction and self-assembly on the zinc metal surface enabling a dendrite-free anode for long-life zinc rechargeable aqueous batteries[J].Applied Surface Science, 2019, 481 :852-859.)

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

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preparation example Construction

[0043] The flow chart of the preparation method of the electrode with biopolymer coating of the present invention is as follows figure 1 As shown, it mainly includes three steps of configuring the film-forming solution, uniformly coating the film-forming solution and inducing crystallization.

[0044] The biopolymer coating can effectively reduce the corrosion and passivation of the electrode by the electrolyte and inhibit the growth of dendrites, such as figure 2 As shown, the formation of Zn dendrites in aqueous electrolytes for uncoated Zn electrodes is difficult to avoid, because the newly deposited Zn ions prefer to adsorb at the initial nucleation sites to minimize the surface energy. Moreover, the dissolved O in the aqueous electrolyte 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 groups on the polymer that coordinate with the zinc ions ...

Embodiment 1

[0046] (1) Disperse 2 g of polyvinyl alcohol (PVA) in 20 ml of deionized water, stir vigorously at 85° C. for 1 h, and cool naturally to room temperature to obtain a PVA gel.

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

[0048] (3) Evenly drop the film-forming solution on the Zn sheet and let it dry naturally.

[0049] (4) Soak the above coating in 75% ethanol aqueous solution to induce the secondary structure transformation of silk fibroin to obtain a zinc negative electrode with a polymer coating.

[0050] The resulting zinc anode with silk fibroin coating image 3 , that is, the direct topography of the product, and the clear coating structure on the electrode can be directly observed.

Embodiment 2

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

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

[0054] (3) Use a brush to evenly brush the film-forming solution on the Zn sheet, and let it dry naturally.

[0055] (4) Use a temperature control box to rapidly cool the sample from 293K to 283K to induce protein crystallization. Finally, a zinc anode with polymer coating was obtained.

[0056] Use the above products as the positive and negative electrodes of the battery, glass fiber as the separator, 2M ZnCl 2 The solution is used as the electrolyte, and the model of the battery case is CR2032, which is asse...

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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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