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Preparation method and application of in-situ rapid growth multifunctional zinc negative electrode protective layer

A zinc negative electrode and multifunctional technology, which is applied in the field of preparation of multifunctional zinc negative electrode protective layer, can solve the problems of dendrite growth, hydrogen evolution problem, poor negative electrode stability, etc. Effect

Active Publication Date: 2022-04-12
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the poor stability of the negative electrode of the aqueous zinc-ion battery, the problems of dendrite growth and hydrogen evolution in the cycle process, the present invention provides a preparation method and application of a multi-functional zinc negative electrode protective layer rapidly grown in situ

Method used

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  • Preparation method and application of in-situ rapid growth multifunctional zinc negative electrode protective layer
  • Preparation method and application of in-situ rapid growth multifunctional zinc negative electrode protective layer
  • Preparation method and application of in-situ rapid growth multifunctional zinc negative electrode protective layer

Examples

Experimental program
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Effect test

Embodiment 1

[0028] Dissolve 0.4g of sodium molybdate into 40mL of deionized water, and at the same time dissolve 0.2g (65wt%) of nitric acid and 0.1g of sodium dodecylbenzenesulfonate into 15mL of deionized water under stirring conditions. Slowly pour the sodium molybdate solution into the above acidic solution, add sodium bicarbonate to adjust the pH to 2, and heat to 40°C in a water bath with stirring. In addition, a 20wt% aqueous solution of sulfuric acid was prepared and the zinc pole piece was immersed in it for acid treatment for 10 seconds, and then it was taken out and cleaned. Cut a suitable size of scotch tape and seal one side of the pole piece. After making the above preparations, put the pole piece into the zinc molybdate treatment solution for 20 seconds, then take it out quickly, clean it with deionized water, and place it in a ventilated environment to dry naturally. After cutting the above-mentioned modified zinc pole piece to a suitable size, a symmetrical battery is as...

Embodiment 2

[0032] Dissolve 0.6g of sodium titanate in 40mL of ethanol, and dissolve 0.2g (≥85wt%) of phosphoric acid and 0.1g of lauric acid in 20mL of ethanol while stirring. Slowly pour the sodium titanate solution into the above acidic solution, add potassium hydrogen phthalate to adjust the pH value to 4, and heat to 30° C. in a water bath while stirring. In addition, a 15wt% dilute hydrochloric acid aqueous solution was prepared, and the zinc pole piece was immersed in it for acid treatment for 20 seconds, and then it was taken out and cleaned. Cut a suitable size of scotch tape and seal one side of the pole piece. After making the above preparations, put the pole piece into the zinc molybdate treatment solution for 40 seconds, then take it out quickly, clean it with deionized water, and place it in a ventilated environment to dry naturally. After cutting the above-mentioned modified zinc pole piece to a suitable size, a symmetrical battery is assembled. The electrolyte is 3M ZnSO...

Embodiment 3

[0035] Dissolve 0.4g of sodium silicate into 30mL of deionized water, and at the same time dissolve 2g (30wt%) of hydrogen peroxide and 0.1g of sodium cetyl sulfate into 10mL of deionized water under stirring conditions. Slowly pour the sodium silicate solution into the above acidic solution, add potassium dihydrogen phosphate to adjust the pH to 3 and heat to 50°C in a water bath with stirring. In addition, prepare 10wt% dilute nitric acid aqueous solution and immerse the zinc pole piece in it for acid treatment for 15s, then take it out and clean it. Cut a suitable size of scotch tape and seal one side of the pole piece. After making the above preparations, put the pole piece into the zinc molybdate treatment solution for 2 minutes, then take it out quickly, clean it with deionized water, and place it in a ventilated environment to dry naturally. After cutting the above-mentioned modified zinc pole piece to a suitable size, a symmetrical battery is assembled. The electroly...

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Abstract

The invention discloses a preparation method and application of a multifunctional zinc negative electrode protective layer rapidly grown in situ. The method comprises the following steps: 1. preparing a surface modification solution A; 2. preparing a surface modification solution B; 3. preparing a surface modification solution B; Surface modification solution A is slowly poured into surface modification solution B under stirring; 4. Prepare rust removal solution; 5. Soak the zinc metal pole piece in the rust removal solution in step 4; 6. Seal the zinc obtained in step 5 One side of the pole piece; 7. Soak the zinc pole piece obtained in step 6 into the modification solution in step 3 to obtain a zinc negative electrode with a modification layer. In the present invention, an interfacial layer tightly combined with the zinc substrate is formed in situ on the surface of the zinc metal negative electrode by the chemical deposition method. The modified layer has uniform thickness and uniform distribution, which can effectively eliminate the surface defects of the zinc negative electrode, guide the uniform deposition of zinc ions, and suppress dendrites. growth, and hinder the precipitation of hydrogen, which is conducive to the stable cycle of the zinc anode, thereby improving the electrochemical performance and cycle life of the battery.

Description

technical field [0001] The invention belongs to the technical field of energy materials, and relates to a preparation method and application of an in-situ rapid growth multifunctional zinc negative electrode protective layer. Background technique [0002] As a promising energy storage system, aqueous zinc-ion batteries (ZIBs) will be strong candidates for large-scale deployment due to their high safety, low cost, and environmental friendliness. In addition, the zinc metal anode due to its high theoretical capacity (mass capacity 820mAh g -1 , volume capacity 5855mAh cm -3 ), low reduction potential (-0.762 V vs. standard hydrogen electrode (SHE)) has attracted much attention. However, due to uneven / peeling galvanizing can cause short circuits and seriously affect battery life. [0003] Recently, some progress has been made in addressing Zn dendrite growth, including electrolyte additives, three-dimensional current collectors, and artificially modified layers. Among them,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/04H01M4/62H01M10/36
CPCH01M4/04H01M4/628H01M10/36Y02E60/10
Inventor 张乃庆陈傲赛范立双张宇
Owner HARBIN INST OF TECH
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