Zinc negative electrode and preparation method and application thereof

A zinc negative electrode and zinc flake technology, applied in the direction of negative electrodes, electrode manufacturing, battery electrodes, etc., can solve the problems of decreased conductivity of the protective layer, limited battery power density, battery polarization that cannot meet high power density, etc., and achieve stability Improved performance, reduced electrochemical reaction impedance, and facilitated large-scale production

Pending Publication Date: 2022-06-07
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] At present, most of the research on artificial protective layers focuses on the method of polymer coating. In practical applications, due to the excessive polarization of the battery, it cannot meet the requirements of high power density.
Invention patent CN11160025A discloses a zinc negative electrode material with an elastic protective layer and its preparation method. The invention is simple to prepare, low in cost, and effectively improves the cycle life of the zinc negative electrode. However, due to the use of a binder, the protective layer inevitably Decreased electrical conductivity, resulting in limited power density of full cells

Method used

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  • Zinc negative electrode and preparation method and application thereof
  • Zinc negative electrode and preparation method and application thereof
  • Zinc negative electrode and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0072] Choose zinc foil with a thickness of 50μm, sand it with 5000-grit sandpaper, and cut it into Electrode pieces of different sizes were ultrasonically cleaned with acetone, ethanol, and water for 10 min in turn. Prepare Tris-HCl (10mmol L -1 ) buffer solution 100 mL, adjust its pH to about 8.5, add dopamine monomer (3 g) and PEG600 (1.5 g) to the solution, and stir until the solution is clear. Take out the cleaned zinc foil, put it into the above-prepared solution, and stir and soak in the air for 24 hours at room temperature. The reacted zinc foil was taken out, rinsed with distilled water for 5 times, and then placed in a freeze dryer for vacuum drying at -40 °C for 6 h. The thickness of the obtained film was determined to be 1 μm.

Embodiment 2

[0074] Choose zinc foil with a thickness of 50μm, sand it with 5000-grit sandpaper, and cut it into Electrode pieces of different sizes were ultrasonically cleaned with acetone, ethanol, and water for 10 min in turn. Prepare Tris-HCl (10mmol L -1 ) buffer solution 100mL, adjust its pH to about 8.5, add dopamine monomer (5g) and PEG600 (2.5g) to the solution, and stir until the solution is clear. Take out the cleaned zinc foil, put it into the above-prepared solution, and stir and soak in the air for 24 hours at room temperature. The reacted zinc foil was taken out, rinsed with distilled water for 3 times, and then placed in a freeze dryer for vacuum drying at -18 °C for 6 h. The thickness of the obtained film was determined to be 3 μm.

Embodiment 3

[0076] Choose zinc foil with a thickness of 50μm, sand it with 5000-grit sandpaper, and cut it into Electrode pieces of different sizes were ultrasonically cleaned with acetone, ethanol, and water for 10 min in turn. Prepare Tris-HCl (10mmol L -1 ) buffer solution 100mL, adjust its pH to about 8.5, add dopamine monomer (7g) and PEG600 (3.5g) to the solution, and stir until the solution is clear. Take out the cleaned zinc foil, put it into the above-prepared solution, and stir and soak in the air for 24 hours at room temperature. The reacted zinc foil was taken out, rinsed with distilled water for 4 times, and then placed in a freeze dryer for vacuum drying at -19 °C for 6 h. The thickness of the obtained film was determined to be 5 μm.

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Abstract

The invention discloses a zinc negative electrode as well as a preparation method and application thereof. The zinc negative electrode comprises a zinc sheet and a protective layer growing on the surface of the zinc sheet, and the protective layer is a film containing polydopamine. According to the zinc negative electrode provided by the invention, the protective layer is rich in multi-electron amino, quinonyl and hydroxyl, the conductivity is relatively good, the adsorption process of zinc ions on the surface of the electrode is accelerated, and the electrochemical reaction impedance is reduced; due to the construction of the protective layer, side reaction between the zinc negative electrode and electrolyte is greatly inhibited, the stability of the zinc negative electrode is remarkably improved, the deposition process of zinc ions on the zinc electrode is effectively regulated and controlled, and pulverization of the zinc negative electrode and generation of zinc dendrites are avoided, so that the coulombic efficiency of the symmetrical zinc ion battery is improved, and the cycle life of the symmetrical zinc ion battery is prolonged. And the capacity retention ratio and the cycle life of the aqueous zinc ion battery are improved.

Description

technical field [0001] The application relates to a zinc negative electrode, a preparation method and application thereof, and belongs to the technical field of aqueous zinc ion batteries. Background technique [0002] With the increasingly prominent energy crisis and environmental problems, it is imperative to change the energy structure, and renewable energy is of great significance to future sustainable development. However, renewable energy is discontinuous and unstable, and its direct connection to the grid will have a great impact on the grid. As a bridge between the power generation side and the grid / user side, energy storage technology is a key technology to achieve smooth power output, peak shaving and valley filling, etc. Among many energy storage technologies, lithium-ion batteries have the advantages of high energy density and long cycle life, and are widely used in various portable electronic devices and electric vehicles. However, the limited reserves and unev...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/42H01M4/02H01M4/04H01M10/36
CPCH01M4/02H01M4/04H01M4/42H01M4/628H01M4/624H01M10/36H01M2004/027H01M2004/021Y02E60/10
Inventor 李先锋常娜娜尹彦斌王胜男张华民
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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