Structure of network-shaped lightweight metal zinc electrode and preparation method thereof

A lightweight, network-like technology, used in electrode manufacturing, structural parts, battery electrodes, etc., can solve the problems of reducing new metal negative electrodes, high cost, and difficult processing, and achieves improved cycle performance, increased energy density, and ease of use. The effect of mass production

Inactive Publication Date: 2019-08-20
浙江浙能中科储能科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the long-term cycle performance of the battery assembled with the above-mentioned negative electrode is not ideal, especially in the application of large-capacity energy storage, the cycle life will be greatly limited
[0006] In actual zinc-ion batteries, the amount of metal zinc electrodes used is far lower than the total amount of zinc ions required for consumption in actual deposition, resulting in low specific energy of this type of battery. Therefore, reducing the amount of new metal negative electrodes is the limit A major obstacle to the application of this type of battery
[0007] In order to reduce the amount of metal zinc negative electrode, the method of reducing the thickness of the electrode is generally adopted. This method is difficult to process, high in cost, and the thickness of the electrode is uneven, so it is not suitable for actual products, etc.

Method used

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  • Structure of network-shaped lightweight metal zinc electrode and preparation method thereof
  • Structure of network-shaped lightweight metal zinc electrode and preparation method thereof
  • Structure of network-shaped lightweight metal zinc electrode and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0041] A 0.05 mg / μl polyvinylidene fluoride (PVDF) binder was prepared. Add polyvinylidene fluoride (PVDF) into methylpyrrolidone (NMP) solution and perform magnetic stirring for 10 hours to obtain a uniformly dispersed binder. Weigh zinc powder, carbon fiber, polyvinylidene fluoride (PVDF) binder and metal bismuth according to the mass percentage ratio of 70:25:4:1 and place them in a beaker, add a stirring magnet and place them on a magnetic stirrer Stir for 5h to obtain a homogeneous slurry.

[0042] The perforated zinc strip is pretreated to degrease, decontaminate and remove the oxide layer. The perforated zinc strip is polished with sandpaper, then ultrasonicated, rinsed with deionized water and alcohol three times, and then dried. The slurry was coated on a punched zinc strip with a thickness of 200 μm, and dried in an oven at 70°C to obtain a lightweight metal zinc electrode.

[0043] The full battery is assembled with manganese oxide as the positive electrode, glass f...

Embodiment 2

[0049] A 0.05 mg / μl polyvinylidene fluoride (PVDF) binder was prepared. Add polyvinylidene fluoride (PVDF) into methylpyrrolidone (NMP) solution and perform magnetic stirring for 10 hours to obtain a uniformly dispersed binder. Weigh zinc powder, graphite, polyvinylidene fluoride (PVDF) binder and metal bismuth according to the mass percentage ratio of 70:25:4:1, put them in a beaker, add a stirring magnet and place them on a magnetic stirrer Stir for 5h to obtain a homogeneous slurry.

[0050] The perforated zinc strip is pretreated to degrease, decontaminate and remove the oxide layer. The perforated zinc strip is polished with sandpaper, then ultrasonicated, rinsed with deionized water and alcohol three times, and then dried. The slurry was coated on a punched zinc strip with a thickness of 200 μm, and dried in an oven at 70°C to obtain a lightweight metal zinc electrode.

[0051] The full battery is assembled with manganese oxide as the positive electrode, glass fiber as...

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Abstract

The invention relates to a structure of a network-shaped lightweight metal zinc electrode. The structure comprises a zinc base layer and a highly active layer on the base layer. The zinc base layer isat least one in the group consisting of foam zinc, a zinc mesh, a grid-shaped zinc plate, a punched zinc band or a zinc fiber fabric and has the thickness of 0.1 micrometer to 10 millimeters. The highly active layer on the base layer comprises zinc powder, conductive carbon material, additives and binders with the mass ratio of (20 to 70%): (60 to 25%): (15 to 4%): (5 to 1%) in the highly activelayer, and the thickness of the highly active layer is between 100 nanometers to 400 micrometers. The zinc powder has a spherical shape and a particle diameter of 10 nanometers to 50 micrometers, andthe mass of the zinc powder accounts for 20 to 70% of the total mass of the highly active layer. The structure has the advantages that a zinc material is used as a matrix, the self-limitation of the non-ideal complete reversibility of the zinc dissolution-deposition can be improved, therefore, a sufficient active material is provided during the large-capacity long-term circulation of a battery, and the cycle performance of the battery is improved.

Description

technical field [0001] The invention belongs to the technical field of zinc batteries, and in particular relates to a structure and a preparation method of a network-like lightweight metal zinc electrode. Background technique [0002] With the rapid development of social economy, the problems of energy shortage and environmental protection need to be solved urgently. Researchers have been committed to the development and use of new renewable resources. However, renewable resources such as wind energy and solar energy are intermittent and fluctuating, and supporting energy storage technologies are required to reasonably incorporate them into the smart grid. Aqueous ion batteries have become the first choice for large-scale energy storage due to their advantages of low cost, good safety and high stability. Zinc can exist stably in aqueous electrolyte, and has the characteristics of low standard potential and high energy density, so it can be used as an excellent choice for th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/02H01M4/04
CPCH01M4/02H01M4/04H01M4/0402Y02E60/10
Inventor 李卓斌杜月秀郑渭建邬荣敏彭浩刘宇
Owner 浙江浙能中科储能科技有限公司
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