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Aqueous zinc ion battery negative electrode, preparation method and battery

A zinc-ion battery, battery negative electrode technology, applied in electrode manufacturing, secondary batteries, active material electrodes, etc., can solve problems such as damage to the overall electrical performance of the battery, increase impedance and polarization, etc., to reduce nucleation overpotential, reduce Polarization and impedance, the effect of increasing the rate of ion transport

Active Publication Date: 2021-12-10
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

Liang Wei's research team at Taiyuan University of Technology (Adv.Energy Mater.2018,8,1801090.) disclosed a porous nano-calcium carbonate coating, which suppresses zinc dendrites to a certain extent by inducing the selective deposition of zinc ions; Cui Guanglei's research team at Qingdao Institute of Bioenergy and Process Research, Chinese Academy of Sciences (Energy Environ.Sci.2019, 12, 1938.) disclosed a polyamide coating, which effectively isolates the side reactions between water molecules and zinc anodes; Xia Yong, Fudan University Yao's research team (Joule 2019, 3, 1289.) disclosed a metal-organic framework material coating, and constructed an artificial solid electrolyte interfacial film on the surface of zinc anode to achieve the effect of inhibiting dendrite growth. However, whether it is an inorganic salt coating or an organic artificial solid electrolyte separator, to a certain extent, due to the conductivity of the interface, the impedance and polarization will be increased, so it will partially damage the battery. The overall electrical performance of

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  • Aqueous zinc ion battery negative electrode, preparation method and battery
  • Aqueous zinc ion battery negative electrode, preparation method and battery
  • Aqueous zinc ion battery negative electrode, preparation method and battery

Examples

Experimental program
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Effect test

Embodiment 1

[0030] This embodiment provides a method for preparing an alloy negative electrode of a water-based zinc-ion battery and the alloy negative electrode of a water-based zinc-ion battery prepared by the preparation method. see figure 1 , the method includes:

[0031]First, through the hydrothermal synthesis of silver nanowires, heat 20.75mL of ethylene glycol to 160°C and stir, then completely dissolve 333mg of polyvinylpyrrolidone in 20.75mL of ethylene glycol, and then dissolve 170mg of silver nitrate in 10mL of ethylene glycol In, and mix two kinds of solutions, then take 1.9464g ferric chloride and dissolve in 10mL pure water to prepare 1.2M ferric chloride solution, 1.6134g cupric chloride is dissolved in 10mL pure water and prepare 1.2M ferric chloride solution, and Add 0.75mL each to the mixed solution, and finally react the uniformly mixed solution in a 100mL reactor at 160°C for 6h and repeat the centrifugation four times to prepare a silver nanowire suspension with a c...

Embodiment 2

[0036] This embodiment provides a method for preparing an alloy negative electrode of a water-based zinc-ion battery and the alloy negative electrode of a water-based zinc-ion battery prepared by the preparation method. The methods include:

[0037] First configure the silver nanowire suspension with a concentration of 3.1g / L by the hydrothermal synthesis method of silver nanowires described in Example 1, then add pure water to dilute the concentration of the silver nanowire suspension to 1.9g / L And stir evenly, select the zinc sheet as the negative electrode substrate, drop 1.9g / L uniform silver nanowire suspension at a lower concentration to the zinc sheet, so that the silver nanowire loading on the surface of the zinc sheet is about 0.14mg / cm 2 ; Dry the silver nanowire suspension on the zinc sheet at 60°C for 3 hours to obtain the desired silver nanowire-zinc alloy negative electrode.

[0038] results and analysis:

[0039] The obtained silver nanowire-zinc alloy negativ...

Embodiment 3

[0042] This embodiment provides a method for preparing an alloy negative electrode of a water-based zinc-ion battery and the alloy negative electrode of a water-based zinc-ion battery prepared by the preparation method. The methods include:

[0043] First configure the silver nanowire suspension with a concentration of 3.2g / L by the hydrothermal synthesis method of silver nanowires described in Example 1, then add pure water to dilute the concentration of the silver nanowire suspension to 2g / L and Stir evenly, select the zinc sheet as the negative electrode substrate, add 2g / L uniform silver nanowire suspension with a lower concentration to the zinc sheet, so that the silver nanowire loading on the surface of the zinc sheet is about 0.15mg / cm 2 ; Dry the silver nanowire suspension on the zinc sheet at 60°C for 3 hours to obtain the desired silver nanowire-zinc alloy negative electrode.

[0044] results and analysis:

[0045] The obtained silver nanowire-zinc alloy negative e...

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Abstract

The invention discloses an aqueous zinc ion battery negative electrode, a preparation method and a battery. The method comprises the steps of (1) dropwise adding a silver nanowire suspension onto a battery negative electrode substrate, wherein the substrate is a zinc sheet; and (2) drying the substrate dropwise added with the silver nanowire suspension to obtain the aqueous zinc ion battery negative electrode, wherein the silver nanowires on the battery negative electrode and the zinc sheet substrate are subjected to alloying reaction in an electrochemical cycle process to form an AgZn3 alloy layer taking the silver nanowires as a three-dimensional substrate. According to the invention, the nucleation overpotential of zinc in the battery cycle process is successfully reduced, the corrosion resistance of the negative electrode is improved by utilizing the stability of the silver-zinc alloy layer to zinc and the isolation effect of the silver-zinc alloy layer to electrolyte, and meanwhile, the impedance and polarization of the battery can be greatly reduced due to the good conductivity of silver, so that the problems of dendritic crystal growth and corrosion in the zinc negative electrode are solved, and the electrochemical performance of the battery is improved.

Description

technical field [0001] The invention belongs to the technical field of zinc ion batteries, and more specifically relates to a negative electrode of an aqueous zinc ion battery, a preparation method and a battery. Background technique [0002] In the contemporary era when traditional fossil energy is gradually depleted, it is the general trend to seek clean energy as an alternative to traditional energy. However, the currently mainly used renewable energy such as wind energy and solar energy have time inhomogeneity in the power generation process, so a suitable Large-scale energy storage equipment has become a key step for the current clean energy to replace fossil energy. Among them, battery equipment has always been considered as the most suitable large-scale energy storage system, and aqueous zinc-ion batteries are considered as large-scale energy storage systems due to their low cost, high safety, environmental friendliness, and high energy density. High-quality choice o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/04H01M10/36H01M4/02
CPCH01M10/36H01M4/02H01M4/04Y02E60/10
Inventor 李真李哲黄云辉王华袁利霞
Owner HUAZHONG UNIV OF SCI & TECH
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