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Zinc-based electrode capable of delaying nucleation of zinc dendrites as well as preparation method and application of zinc-based electrode

A zinc dendrite, zinc-based technology, applied in electrode manufacturing, electrode rolling/calendering, battery electrodes, etc., can solve the problem of low lattice mismatch between zinc-based and substrate, water-based zinc-ion batteries Poor electrode stability, short battery life and other issues, to avoid internal short-circuit battery failure, delay the growth of dendrite orientation, and not easy to short-circuit the effect

Pending Publication Date: 2021-12-07
GUANGDONG INST OF MATERIALS & PROCESSING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chinese patent CN201910931067.X discloses a ZnAl eutectic alloy electrode with a lamellar structure. Through this lamellar structure, the electrode has higher conductivity and has a higher efficiency in the process of stripping and depositing the ion metal surface. The stability of the electrode solves the problem of poor electrode stability of the aqueous zinc-ion battery
[0007] However, the above research does not guide how to choose the substrate, nor does it solve the problem of low lattice mismatch between the zinc base and the substrate, and there are still defects such as too fast formation of dendrites, deformation of the surface electrodes, and short service life of the battery.

Method used

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  • Zinc-based electrode capable of delaying nucleation of zinc dendrites as well as preparation method and application of zinc-based electrode
  • Zinc-based electrode capable of delaying nucleation of zinc dendrites as well as preparation method and application of zinc-based electrode
  • Zinc-based electrode capable of delaying nucleation of zinc dendrites as well as preparation method and application of zinc-based electrode

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preparation example Construction

[0040] A preferred embodiment of the present invention provides a method for preparing a zinc-based electrode material, the method specifically comprising:

[0041] Use commercially available zinc ingots, which are pure zinc (purity above 95%) polycrystalline or binary or multi-element zinc alloys with a zinc content (mass fraction) above 85% or zinc and zinc oxide composite materials, after a constant temperature of 100°C Under the condition of heat preservation for 3 hours, adjust the rolling temperature of the mechanical rolling mill to 100°C or slightly higher than 100°C, preheat to the rolling temperature, adjust the relative height of the rollers of the rolling mill, and use the hot (warm) rolling plastic deformation processing method in the Single-pass or reciprocating multi-pass rolling at a temperature of 100°C to form a zinc plate, and keep the rolling plate and rolling direction unchanged during the rolling process. At the same time, by adjusting the relative height...

Embodiment 1

[0050] This embodiment 1 provides a battery, which is prepared by the following steps:

[0051] S1: heat a commercially available pure zinc plate with a purity of more than 95% in a vacuum oven at a constant temperature of 100°C for 3 hours;

[0052] S2: Adjust the rolling temperature of the hot rolling mill to 100°C, and start hot rolling (warm rolling) the above-mentioned thermal insulation zinc plate after the surface temperature of the roll reaches the preset temperature;

[0053] S3: Control the deformation of the zinc ingot by adjusting the height of the roll to an appropriate value, avoid edge cracks due to excessive deformation during the rolling process of the zinc plate, and keep the zinc plate and the rolling direction unchanged during the rolling process;

[0054] S4: In order to avoid the thermal effect caused by mechanical cutting to change the physical and chemical properties of the material, the high-pressure water jet cutting machine is used as a cold working ...

Embodiment 2

[0059] This embodiment 2 provides a battery, which is prepared by the following steps:

[0060] S1: heat a commercially available pure zinc column with a purity of more than 95% in a vacuum oven at a constant temperature of 100°C for 3 hours;

[0061] S2: Adjust the temperature of the metal drawing machine to 100°C. When the temperature reaches the preset temperature, start the drawing experiment of the above-mentioned thermal insulation zinc column;

[0062] S3: By uniformly controlling the deformation of the zinc ingot, avoiding the breakage of the zinc column due to excessive deformation during the drawing process, while keeping the zinc column and the drawing direction unchanged during the drawing process;

[0063] S4: In order to avoid changing the physical and chemical properties of the material due to the thermal effect caused by mechanical cutting, a high-pressure water jet cutting machine is used as a cold processing method to cut the drawn zinc column or zinc wire in...

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Abstract

The invention discloses a zinc-based electrode material and a preparation method and application thereof. The method comprises the following steps of adopting a polycrystalline metal zinc block (ingot) as an initial raw material, and preparing a zinc-based negative electrode with specific crystal face preferred orientation by using a machining method of mechanical plastic deformation and cold cutting, wherein the zinc-based negative electrode can be applied to the field of zinc-based rechargeable secondary energy storage devices. According to the method, the plastic deformation machining method is adopted to process a polycrystalline metal zinc material with crystal face orientation random distribution or weak texture to generate the polycrystalline metal zinc with specific crystal face preferred orientation and a composite negative electrode material of the polycrystalline metal zinc, and the polycrystalline metal zinc and the composite negative electrode material can be used as a negative active electrode material of a secondary rechargeable battery. The zinc-based negative electrode obtained through processing has the characteristic of specific crystal face preferred orientation, and compared with a zinc material with crystal face orientation random distribution or other crystal face preferred orientation, the nucleation time of dendritic crystals in the high-power charging process of the secondary battery and the like can be shortened, so that the generation of the dendritic crystals is delayed, and the service life of a rechargeable energy storage device is prolonged.

Description

technical field [0001] The invention relates to the technical field of electrode preparation, in particular to a zinc-based electrode capable of delaying the nucleation of zinc dendrites, a preparation method and application thereof. Background technique [0002] The development of clean and green new energy battery technology has important practical significance for ensuring the energy supply of my country's economic and social development and protecting the ecological environment. Zinc has the advantages of high specific energy, abundant sources, and low cost. Compared with other active metal anodes, zinc has the best comprehensive performance. Common secondary rechargeable energy storage devices using zinc-based negative electrodes include: nickel-zinc batteries, silver-zinc batteries, Zn 2+ Ion battery, Zn 2+ Supercapacitors and ReHAB batteries, etc. Among them, the theoretical energy density of nickel-zinc batteries can reach 372Wh / kg, which is very close to the theo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/42H01M4/48H01M4/24H01M4/26H01M4/30H01M4/04H01M10/28H01M10/30H01M10/36H01M10/38
CPCH01M4/38H01M4/42H01M4/362H01M4/48H01M4/26H01M4/30H01M4/244H01M4/04H01M4/0435H01M10/30H01M10/36H01M10/28H01M10/38Y02E60/10Y02P70/50
Inventor 鲍祺郑开宏
Owner GUANGDONG INST OF MATERIALS & PROCESSING
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