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A kind of negative electrode material of zinc-based secondary battery and preparation method thereof

A technology for secondary batteries and negative electrode materials, applied in battery electrodes, alkaline batteries, circuits, etc., can solve problems such as inability to effectively suppress Zn, improve hydrogen evolution overpotential and Coulomb efficiency, reduce hydrogen evolution corrosion, and inhibit dendrites. effect of growth

Inactive Publication Date: 2020-09-01
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] None of the current coating materials can effectively inhibit Zn(OH) 4 2- Diffusion into electrolyte and hydrogen evolution corrosion

Method used

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  • A kind of negative electrode material of zinc-based secondary battery and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] (1) Weigh 5g of zinc oxide powder in proportion and add it to 50ml of deionized water, stir for 10 minutes to form a suspension solution of zinc oxide, and then sonicate for 40 minutes to form a zinc oxide dispersion. Add 5ml of ammonia water with a mass fraction of 3% to the dispersion dropwise and stir for 5 minutes, add sodium carbonate-sodium bicarbonate buffer solution to adjust the pH of the solution to 8.5, continue stirring for 120 minutes, and then filter to obtain modified zinc oxide powder.

[0046] (2) Add the modified zinc oxide powder to 30ml of a mixed solution containing 7wt% perfluorosulfonic acid resin and 1wt% fluorine-containing acrylic resin, keep the temperature of the mixed solution at 50°C and ultrasonically 100min, then filter through Separated to obtain cationic resin-coated zinc oxide powder.

[0047] (3) Measure 50ml of SnCl with a concentration of 0.4mol / L 2 and LaCl at a concentration of 0.1mol / L 3 Put the methanol mixed solution into a b...

Embodiment 2

[0051] (1) Weigh 5 g of zinc oxide powder in proportion and add it to 60 ml of methanol, stir for 15 min to form a suspension solution of zinc oxide, and then ultrasonicate for 60 min to form a zinc oxide dispersion. Add 3ml of 5% ammonium chloride solution dropwise to the dispersion and stir for 5 minutes, add ammonia water-ammonium chloride buffer to adjust the pH of the solution to 9.4, continue stirring for 150 minutes, and then filter to obtain modified zinc oxide powder.

[0052] (2) Add the modified zinc oxide powder to 35ml of a mixed solution containing 10wt% perfluorosulfonic acid resin and 1.5wt% fluorine-containing polyurethane resin, keep the temperature of the mixed solution at 60°C and ultrasonically 150min, and then pass Filtration and separation to obtain cationic resin-coated zinc oxide powder.

[0053] (3) Measure 40ml concentration of 0.3mol / LBi(NO 3 ) 3 and 0.1mol / LCe(NO 3 ) 3 Put the mixed solution of ethylene glycol into a beaker, then add zinc oxid...

Embodiment 3

[0057] (1) The zinc oxide powder that takes 5g is added in the ethanol of 70ml, stirs 20min to form the suspension solution of zinc oxide, then ultrasonic 90min forms zinc oxide dispersion liquid, adds 6ml mass fraction to this dispersion liquid dropwise and is 5% ammonium carbonate The solution was stirred continuously, borax-sodium carbonate buffer solution was added to adjust the pH value of the solution to 10, the stirring was continued for 200 min, and then modified zinc oxide powder was obtained by filtration.

[0058] (2) Add the modified zinc oxide powder to 30ml of a mixed solution containing 15wt% perfluorosulfonic acid resin and 2wt% polystyrene-divinylbenzenesulfonic acid resin, keep the temperature of the mixed solution at 80°C and Ultrasound for 100 min, and then separated by filtration to obtain cationic resin-coated zinc oxide powder.

[0059] (3) Measure 50ml concentration of 0.6mol / LIn(NO 3 ) 3 and a concentration of 0.2mol / L Pr(NO 3 ) 3 Put the aqueous s...

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Abstract

The invention relates to a negative electrode material of zinc-based secondary batteries and a preparation method thereof. According to the method, a modification reagent is added to make positive charges evenly distributed on the surface of zinc oxide, cationic resin uniformly coats zinc oxide through electrostatic adsorption, and the thickness is 5-50 nm. The zinc oxide coated with the cationicresin is put into a mixed metal salt solution and stirred, metal ions are uniformly adsorbed in a cationic resin coating layer, and a reducing agent is added to make the metal ions reduced to metal elementary substances of 3-7 nm. The cationic resin coating the zinc oxide can effectively inhibit Zn(OH)42- from diffusing into an electrolyte solution and prevent or release the deformation and dendrite growth of zinc negative electrodes in charging and discharging circulation; nanoscale metal particles adsorbed in the cationic resin layer can improve hydrogen evolution overpotential and coulombicefficiency and reduce hydrogen evolution corrosion and dendrite growth. By means of the method, the cycle performance of the zinc negative electrodes can be improved, and the marketization of the zinc-based secondary batteries is facilitated.

Description

technical field [0001] The invention relates to the field of preparation of alkaline secondary battery negative electrode materials, in particular to a zinc-based secondary battery negative electrode material and a preparation method thereof. [0002] technical background [0003] With the improvement of people's awareness of environmental protection, the development of a new type of secondary power battery that is environmentally friendly, long cycle life, safe and reliable has become a research hotspot in various countries. Zinc-based secondary batteries have the advantages of high operating voltage, high energy density and power density, and no memory effect. Compared with lithium-ion batteries, zinc-based secondary batteries are water-based batteries, which will not pollute the environment during production and use. Moreover, zinc resources are abundant and the cost is relatively low, which makes zinc-based secondary batteries have a broad market Application prospects. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/48H01M4/62H01M10/24
CPCH01M4/366H01M4/48H01M4/628H01M10/24Y02E60/10
Inventor 田忠良赵泽军辛鑫杨超宗传鑫赖延清李劼
Owner CENT SOUTH UNIV
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