Electrode coating as well as preparation method and application thereof

An electrode and coating technology, applied in the field of electrode coating and its preparation, can solve problems such as unfavorable zinc negative electrode application, short circuit in the battery, battery failure, etc., and achieve the effects of inhibiting corrosion and hydrogen evolution reaction, super long cycle life, and low cost

Active Publication Date: 2020-12-11
HUNAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the zinc negative electrode will generate dendrites during the cycle, causing the internal short circuit of the battery, thus making the battery invalid.
In addition, zinc has serious self-corrosion and hydrogen evolution reactions in the electrolyte, which is not conducive to the practical application of zinc anodes.

Method used

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  • Electrode coating as well as preparation method and application thereof
  • Electrode coating as well as preparation method and application thereof
  • Electrode coating as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] Dissolve PVDF in nitrogen nitrogen dimethyl pyrrolidone solution, and then add 100nm BaTiO 3 Nanoparticles are added into the homogeneous solution, ultrasonically dispersed and magnetically stirred to make it a homogeneous slurry, in which the mass ratio PVDF: BaTiO 3 for 5:95. Use the cleaned and polished zinc foil as the base, use a coating machine to evenly coat the slurry on the zinc foil, dry it in vacuum at 60°C for no less than 3 hours, and cut it into 1cm -2 The disc electrode is used as a spare. Such as Figure 8 As shown, coated BaTiO 3 The surface of the coated zinc foil is covered with a layer of uniform nanoparticles, and further zoomed in, it is found that the coating has uniform small pores, such as Figure 9 As shown, it can be used as a channel for ion transmission. are significantly different from bare zinc foil, such as Figure 10 shown. Using XRD to characterize nano-BT found that, as Figure 11 As shown, the nanoparticles are a single BT pha...

Embodiment 2

[0060] Using the BaTiO prepared in Example 1 3 The coated zinc foil was used as the electrode, and the electrolyte, diaphragm and battery case used in Comparative Example 1 were used to assemble the Zn@BT||Zn@BT symmetric battery, and the cycle stability of the battery was tested under different charge and discharge current conditions. 0.5mA cm -2 -0.5mAh cm -2 Under the same charging and discharging conditions, the symmetrical battery can stably cycle for more than 420 hours, which is 22 times that of the Zn||Zn symmetrical battery of the control example, such as figure 2 , and the Zn@BT anode has lower hysteresis voltage and nucleation overpotential, such as image 3 shown. at 0.2 mA cm -2 -1mAh cm -2 Under certain charging and discharging conditions, it can stably cycle for 500h, which is 7 times that of Zn||Zn symmetric batteries, such as figure 1 shown. Similarly, using the MnO in the control example 2 The positive electrode assembly full battery test found that ...

Embodiment 3

[0062] Use the slurry in Example 1 to evenly coat the cleaned copper foil to control the thickness of the coating, then vacuum dry at 60°C for no less than 3 hours, and cut into 1cm 2 The wafer current collector (Cu@BT). Using the electrolyte, separator and battery case in Comparative Example 1, and then using the bare zinc foil as the negative electrode, and Cu@BT to assemble a Zn||Cu@BT half-cell, the test found that the Zn||Cu@BT half-cell was 0.5mA cm -2 -0.5mAh cm -2 Under the charging and discharging conditions, it can stably cycle more than 220 times, which is 9 times that of the Zn||Cu half-cell of the control example, such as Figure 4 shown. At the same time, the study of the deposition voltage of zinc on the current collector for the first time found that the Cu@BT current collector has a lower zinc nucleation overpotential of 26mV, which is much lower than the nucleation overpotential of bare copper foil of 54mV, such as Figure 6 shown. Likewise, at 2mA cm -...

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Abstract

The invention discloses an electrode coating as well as a preparation method and an application thereof. According to a coating formed by the coating, the uniformity of zinc deposition is adjusted byusing a cheap nano dielectric filler, on one hand, transmission of zinc ions can be adjusted by a nano channel formed by nano particles, and on the other hand, nucleation sites of zinc on an electrodecan be increased, so that dendritic-crystal-free zinc deposition is realized. Meanwhile, water molecules in an electrolyte can be effectively isolated under the barrier action of dipoles generated bythe coating containing the high-dielectric-constant nano filler and physics, so that corrosion and hydrogen evolution reaction on the zinc negative electrode are inhibited, and the stability of the zinc negative electrode can be remarkably improved. A coating layer formed by the coating is large in dielectric filler proportion, dipole-dipole effect produced by the dielectric filler can be used, distribution of zinc ions relative to the surface of an electrode can be adjusted through the electrostatic interaction of dipoles and the zinc ions, the tip electric field enhancement effect is weakened, nucleation sites on the surface of the electrode are increased, and therefore dendritic crystals are effectively restrained from being generated.

Description

technical field [0001] The invention belongs to the technical field of energy storage materials, and in particular relates to a coating for electrodes and a preparation method and application thereof. Background technique [0002] Energy storage materials are the key to clean energy from generation to storage and efficient use. Lithium-ion batteries and lead-acid batteries, as representatives of high energy density and low cost respectively, occupy a key position in the battery industry. However, the price of lithium-ion batteries, the reserves of lithium resources and the safety of batteries all restrict its development, and the low energy density and environmental pollution of lead-acid batteries are not conducive to its sustainable development. Energy-dense battery energy storage devices are crucial. [0003] Aqueous zinc-ion batteries have the advantages of safety and environmental protection, and the zinc-ion batteries with zinc metal as the negative electrode have th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/66H01M4/04H01M4/02H01M10/36H01M10/42
CPCH01M4/62H01M4/622H01M4/667H01M4/0404H01M4/02H01M10/36H01M10/4235Y02E60/10
Inventor 王芳谢春霖马南山欧云
Owner HUNAN UNIV OF SCI & TECH
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