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Surface coating modified zinc metal negative electrode and preparation and application thereof

A surface coating, zinc metal technology, applied in the field of water-based zinc-ion batteries, to achieve high ionic conductivity, improved long-cycle stability and life, and good hydrophilicity.

Pending Publication Date: 2022-04-15
QILU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a zinc metal negative electrode modified by surface coating and its preparation and water-based zinc ion battery. The zinc metal negative electrode provided by the invention is intended to solve the problem of dendrites due to the uneven deposition / stripping of zinc, and improve The cycle stability of the battery prolongs the service life of the battery

Method used

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  • Surface coating modified zinc metal negative electrode and preparation and application thereof
  • Surface coating modified zinc metal negative electrode and preparation and application thereof
  • Surface coating modified zinc metal negative electrode and preparation and application thereof

Examples

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Embodiment 1

[0028] The present embodiment provides a zinc metal negative electrode modified by a surface coating, comprising the steps of:

[0029] 1) Cut a piece of zinc foil of 7cm×10cm, and polish the surface of the zinc foil with 3000-grit sandpaper. After grinding, the thickness of the zinc foil is 0.085mm, and then wash it with ethanol to obtain a zinc foil with a smooth surface and no oxide layer.

[0030] Put 0.1g of polyvinyl chloride powder and 0.1g of zinc trifluoromethanesulfonate powder in a 15mL glass bottle, add 3g of N,N-dimethylformamide solvent, and stir in an oil bath at 85°C for 2 hours , cooling down at room temperature to form a uniform and transparent polymer coating solution;

[0031] 2) Using the scraping method, use a dropper to measure 3mL of the polymer coating solution on a 7cm×10cm polished zinc foil, and use a 300µm scraper to scrape the polymer solution evenly. Dry the coated zinc foil in a vacuum oven at 60°C for 12 hours to form a dense, uniform and tran...

Embodiment 2

[0036] Example 2 Preparation of zinc foil, cutting of zinc negative electrode sheet, half-cell assembly and electrochemical test according to the method of Example 1, the difference is that the polymer coating solution used to prepare zinc negative electrode is polyvinyl chloride: trifluoro Zinc methanesulfonate: N,N-dimethylformamide = 2:1:30 mixed to form.

Embodiment 3

[0038] Example 3 Preparation of zinc foil, cutting of zinc negative electrode sheet, half-cell assembly and electrochemical test according to the method of Example 1, the difference is that the polymer coating solution used to prepare the zinc negative electrode is polyvinyl chloride: trifluoro Zinc methanesulfonate: N,N-dimethylformamide = 1:1:60 mixed to form.

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Abstract

The invention discloses a surface coating modified zinc metal negative electrode as well as preparation and application thereof, and belongs to the field of secondary battery electrode materials. The surface coating modified zinc metal negative electrode provided by the invention is composed of a metal zinc sheet and a modified polyvinyl chloride coating coated on the surface of the metal zinc sheet. The modified polyvinyl chloride coating comprises polyvinyl chloride and fluorine-containing zinc salt. The cycle life of a symmetrical battery assembled by using the modified zinc metal negative electrode is as long as 1000 hours, a large number of polar chlorine atom groups contained in the coating can be used as active sites for guiding zinc deposition, uniform zinc deposition is induced, dendritic crystal formation is inhibited, and meanwhile, fluorine-containing zinc salt can reduce corrosion reaction and improve coulombic efficiency, so that the service life of the battery is prolonged, and the service life of the battery is prolonged. The electrochemical performance and the cycle life of the battery are improved.

Description

technical field [0001] The invention belongs to the field of water-based zinc-ion batteries, and in particular relates to a surface-coated modified zinc metal negative electrode and its preparation and application. Background technique [0002] Rechargeable aqueous Zn-ion batteries have attracted much attention due to their high theoretical capacity, low redox potential, high abundance, and intrinsic safety. Although aqueous Zn-ion batteries are considered to be an important alternative to Li-ion batteries, unfortunately, when metallic Zn is used as the anode, it is inevitable to generate Zn due to the uneven two-dimensional diffusion during the deposition / stripping process. Dendrites, and there are side reactions between the zinc matrix and the electrolyte, which greatly reduces the cycle life of the battery. To address these issues, many strategies have been proposed, such as electrolyte regulation, diaphragm modification, and anode structure adjustment. Although these s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/134H01M4/1395H01M10/36
CPCH01M4/134H01M4/1395H01M10/36H01M2004/027
Inventor 王金国刘伟良葛林恒乔从德何东新姚金水蔡小霞
Owner QILU UNIV OF TECH