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Zinc ion battery liquid metal composite negative electrode and preparation method and application thereof

A zinc-ion battery, liquid metal technology, applied in battery electrodes, electrolyte battery manufacturing, secondary batteries, etc., can solve problems such as capacity attenuation, eliminate dendrites, increase battery system interface impedance, achieve simple preparation process, avoid being Corrosion, the effect of improving corrosion resistance

Active Publication Date: 2020-11-10
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the inherent insulation of zinc oxide will increase the interface impedance of the battery system, resulting in capacity attenuation, and this method cannot essentially eliminate dendrites.

Method used

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  • Zinc ion battery liquid metal composite negative electrode and preparation method and application thereof
  • Zinc ion battery liquid metal composite negative electrode and preparation method and application thereof
  • Zinc ion battery liquid metal composite negative electrode and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] 1. Preparation of composite pole piece

[0040] Based on the composite pole piece of zinc metal matrix, its preparation method comprises the following steps:

[0041] S1: Polish the surface of a commercial zinc foil with a thickness of 0.5mm (purity>99.999%) to remove the oxide layer with an electric grinder, and wash it alternately and repeatedly with distilled water and absolute ethanol to remove oxidized impurities on the surface of the zinc foil and increase the The roughness of the surface of the large zinc foil is cut into a diameter of 14mm and dried at room temperature for later use;

[0042] S2: At room temperature, use a pipette gun to pipette liquid gallium-indium alloy at room temperature, apply liquid gallium-indium alloy on the surface of zinc foil by mechanical scraping method, make the surface of zinc foil react with liquid gallium-indium alloy, and let it stand for 10 minutes Finally, wipe it clean so that the liquid gallium-indium alloy has a certain ...

Embodiment 2-6

[0077] Examples 2-6 were respectively prepared according to the method of Example 1 based on the composite pole piece of zinc metal matrix and the CR2016 type button symmetrical battery was prepared respectively with the composite pole piece as the positive and negative electrodes. The difference between Examples 2-6 lies in the thickness of the zinc foil , gallium-indium alloy surface density on the surface of zinc foil and the time of standing during preparation are different, specifically as shown in Table 1; The test of the battery cycle performance, the test results are shown in Table 1:

[0078] Table 1 Preparation parameters of composite pole pieces and battery cycle performance test results of comparative examples 2-6

[0079]

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Abstract

The invention discloses a zinc ion battery liquid metal composite negative electrode and a preparation method and application thereof. The composite negative electrode comprises a zinc metal matrix and a liquid alloy layer, and the liquid alloy layer is arranged on the surface of the zinc metal matrix. The characteristic of low solubility of zinc metal in the liquid gallium-based alloy is utilized, the zinc metal can be used as an electrochemically inert liquid coating material, the liquid alloy layer is formed by coating the surface of the zinc metal matrix with the liquid gallium-based alloy, and zinc ion flow, close to the surface of the negative electrode, of electrolyte can be well homogenized. Meanwhile, zinc is in a saturated state in the liquid gallium-based alloy, so zinc in the circulation process finally uniformly nucleates and grows on the surface of the zinc metal matrix, and dendrites are prevented from being formed on the surface of the composite negative electrode. Meanwhile, by compounding with gallium and indium with high hydrogen evolution overpotential, the corrosion resistance of the composite zinc negative electrode can be improved, the problem of side reactions such as negative electrode corrosion hydrogen production in the zinc ion battery is relieved, the cycle life of the zinc ion battery is prolonged, and the use stability and safety of the battery are improved.

Description

technical field [0001] The invention relates to the technical field related to the preparation of negative electrodes for zinc-based batteries, and more specifically, to a liquid metal composite negative electrode for zinc-ion batteries and its preparation method and application. Background technique [0002] Sustainable energy exploration and environmental protection are research hotspots at this stage. In the past 40 years, zinc-ion batteries have been widely used due to their high theoretical specific capacity (820mAh g -1 ) and inherent safety characteristics (-0.763V vs. standard hydrogen electrode) in aqueous electrolytes have been widely used. At present, due to the inherent dendrite growth of the metal zinc anode at the liquid electrolyte-solid electrode interface, accompanied by side reactions such as hydrogen evolution, it cannot meet the needs of long cycle life in the field of power energy and large-scale energy storage. [0003] Unlike pure current collectors ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M2/32H01M4/134H01M4/1395H01M10/058H01M10/054
CPCH01M4/628H01M4/134H01M4/1395H01M10/058H01M10/054Y02E60/10Y02P70/50
Inventor 纪效波刘城邹国强侯红帅
Owner CENT SOUTH UNIV
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