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Preparation method of aqueous corrosion-resistant dendritic-crystal-free metal negative electrode

A metal negative electrode and corrosion-resistant technology, which is applied in the field of energy storage, can solve the problems of reducing the utilization rate of metal negative electrodes, reducing the utilization rate of metal negative electrodes, and corrosion of metal negative electrodes, so as to reduce local current density, reduce deposition overpotential, and reduce side reactions. Effect

Inactive Publication Date: 2020-06-19
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Directly using metal as the negative electrode of the electrochemical energy storage system can further increase the energy density, but because the metal negative electrode often has high chemical and electrochemical activities, it is often easy to mix with the electrolyte solvent and other substances dissolved in the electrolyte. The reaction will cause the corrosion of the metal negative electrode, which will further lead to the reduction of the utilization rate of the metal negative electrode, and even the risk of gas production and explosion
On the other hand, due to the uneven deposition / extraction of the metal negative electrode during the cycle, it will lead to the problem of dendrite growth, and the growth of dendrite will lead to the appearance of "dead" metal on the one hand, and then reduce the metal negative electrode. Utilization, on the other hand, it is also very easy to pierce the diaphragm and cause a short circuit of the battery or capacitor, which will not only lead to premature death of the electrochemical energy storage system, but also may cause a sharp rise in the internal temperature of the battery, causing risks such as combustion and explosion.

Method used

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  • Preparation method of aqueous corrosion-resistant dendritic-crystal-free metal negative electrode
  • Preparation method of aqueous corrosion-resistant dendritic-crystal-free metal negative electrode
  • Preparation method of aqueous corrosion-resistant dendritic-crystal-free metal negative electrode

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Embodiment 1

[0038] This embodiment provides a method for preparing an aqueous corrosion-resistant, dendrite-free metal negative electrode, which at least includes the following steps:

[0039] The first step, active metal sheet pretreatment: the dense zinc metal sheet is polished with 10-500 mesh sandpaper to remove impurities, and then washed three times with inert gas-saturated deionized water for a total of 1000s. Carry out natural drying to obtain the pretreated zinc metal sheet, and then cut the pretreated zinc metal sheet into zinc metal sheets of different sizes for use; the thickness of the zinc metal sheet is 0.001mm-50mm; the size is 2mm-50m .

[0040] In the second step, the chemical deposition method is used to dissolve the halide salt (indium chloride) of the inactive metal indium in deionized water, stir well, and the stirring temperature is 40 ° C, and prepare a 0.1mol / L indium chloride aqueous solution. Then soak the pretreated and cut zinc metal sheet obtained in the fir...

Embodiment 2

[0044] This embodiment provides a method for preparing an aqueous corrosion-resistant, dendrite-free metal negative electrode, which at least includes the following steps:

[0045] The first step, active metal sheet pretreatment: the dense zinc metal sheet is polished with 10-500 mesh sandpaper to remove impurities, and then washed twice with dilute sulfuric acid with a concentration of 1.5mmol / L. The total treatment time is 1500s, and then Carry out natural drying at room temperature, obtain the zinc metal sheet after the pretreatment, then the zinc metal sheet after the pretreatment is cut into the zinc metal sheet of different sizes for use; The thickness of the zinc metal sheet is 0.001mm-50mm; The size is 2mm-50m.

[0046] In the second step, the chemical deposition method is used to dissolve the halide salt (indium chloride) of inactive metal indium in deionized water, stir well, and the stirring temperature is 50 ° C, and prepare a 0.5mol / L indium chloride aqueous solut...

Embodiment 3

[0049] This embodiment provides a method for preparing an aqueous corrosion-resistant, dendrite-free metal negative electrode, which at least includes the following steps:

[0050] The first step, active metal sheet pretreatment: the dense zinc metal sheet is polished with 10-500 mesh sandpaper to remove impurities, and then washed four times with dilute acetic acid and acetone with a concentration of 1.5mmol / L. The total processing time is 2500s, then blow dry at room temperature to obtain the pretreated zinc metal sheet, then cut the pretreated zinc metal sheet into zinc metal sheets of different sizes for use; the thickness of the zinc metal sheet is 0.001mm-50mm; the size 2mm-50m.

[0051] In the second step, the method of chemical deposition is adopted to dissolve the salt of inactive metal copper (copper sulfate) in deionized water, stir fully, the stirring temperature is 30°C, and prepare a 0.1mol / L copper sulfate aqueous solution, and then the first The zinc metal she...

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Abstract

The invention belongs to the technical field of energy storage and particularly relates to a preparation method of a corrosion-resistant dendritic-crystal-free metal negative electrode for water-basedelectrochemical energy storage. The method mainly comprises the following steps: polishing, grinding, cleaning and drying a metal sheet, and cutting the metal sheet into metal sheets with different sizes; carrying out surface modification on the metal sheets; and fully washing the modified metal sheets, removing impurities, and then performing evaporating and drying to obtain a surface-modified corrosion-resistant dendritic-crystal-free metal negative electrode. According to the invention, a layer of inactive metal is modified on a surface of relatively active metal; on one hand, an inactivemetal layer can reduce the side reaction between the active metal and an electrolyte; the active metal is endowed with corrosion resistance; on the other hand, the affinity to active metal atoms is higher, the deposition overpotential is reduced, the active metal is promoted to have more uniform deposition sites and ion flow in a deposition process, meanwhile, the surface of a rough modification layer has a relatively large specific surface area, the local current density is reduced, and then the dendritic-crystal-free metal negative electrode is obtained.

Description

technical field [0001] The invention belongs to the field of energy storage technology (battery, supercapacitor), and in particular relates to a method for preparing a corrosion-resistant and dendrite-free metal negative electrode for water system electrochemical energy storage. Background technique [0002] Aqueous electrochemical energy storage systems have attracted widespread attention due to their unparalleled high safety. Due to the advantages of low redox potential and high specific capacity, metal anodes are considered as ideal anode materials for corresponding electrochemical energy storage systems (batteries, supercapacitors). Directly using metal as the negative electrode of the electrochemical energy storage system can further increase the energy density, but because the metal negative electrode often has high chemical and electrochemical activities, it is often easy to mix with the electrolyte solvent and other substances dissolved in the electrolyte. The react...

Claims

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Application Information

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IPC IPC(8): H01M4/04H01M4/62H01M10/36
CPCH01M4/0404H01M4/0421H01M4/045H01M4/62H01M10/36Y02E60/10
Inventor 翁哲韩大量吴士超杨全红
Owner TIANJIN UNIV
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