Metal zinc negative electrode protected by chemical passivation layer as well as preparation method and application of metal zinc negative electrode

A technology of chemical passivation and metal zinc, which is applied in the direction of electrode manufacturing, electrochemical generator, metal material coating process, etc., can solve the problems of irreversible consumption of zinc, lower deposition/dissolution efficiency, lower battery life, etc.

Pending Publication Date: 2022-07-29
GUANGXI UNIV
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0004] The energy storage and conversion of aqueous zinc-ion batteries is achieved through Zn 2+ It is realized by the migration between positive and negative electrodes. Among them, the metal zinc negative electrode will undergo side reactions such as dendrite growth, corrosion (hydrogen evolution) and other side reactions during the cycle. These problems lead to irreversible consumption of zinc, reducing its deposition / Dissolution efficiency, but also greatly reduce the service life of the entire battery

Method used

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  • Metal zinc negative electrode protected by chemical passivation layer as well as preparation method and application of metal zinc negative electrode
  • Metal zinc negative electrode protected by chemical passivation layer as well as preparation method and application of metal zinc negative electrode
  • Metal zinc negative electrode protected by chemical passivation layer as well as preparation method and application of metal zinc negative electrode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 1) A commercial zinc foil (10×10 cm, 100 μm) was ultrasonically cleaned with deionized water and absolute ethanol for 15 minutes in sequence, and then placed in a vacuum drying box for vacuum drying at 60°C after cleaning.

[0028] 2) Weigh 10g NaSiO 3 , add 500 mL of deionized water, stir in a water bath for 30 min at a temperature of 40 °C to fully dissolve it, and add 1 mol L of water dropwise. -1 HNO 3 Adjust the pH value of the passivation solution to make the pH value 3;

[0029] 3) Put the dried zinc foil in the passivation solution, keep the temperature of the water bath at 40°C, take it out after soaking for 5 minutes, wash the surface of the zinc foil with deionized water and absolute ethanol respectively, and place it in a vacuum drying oven after cleaning. Dry under vacuum at 60°C.

[0030] 4) The modified zinc foil obtained by drying is punched into an electrode disk with a diameter of 12 mm on a microtome, and a zinc|zinc symmetrical battery is assemble...

Embodiment 2

[0034] The rest of the conditions are the same as in Example 1, except that the soaking time of the zinc foil is changed to 15 min.

[0035] like figure 2 As shown in the figure, with the prolongation of the soaking time to a certain extent, the modified zinc negative electrode obtained in this example, the passivation layer becomes continuous and uniform, and completely covers the zinc substrate.

[0036] like Figure 5 As shown, due to the improvement of film formation quality, the modified zinc anode obtained in this example can run stably for 1100 h.

[0037] like Figure 7 and Figure 8 It can be seen from the comparison between the SEM image of the modified zinc anode after cycling in this example and the SEM image of the ordinary zinc anode after cycling that, compared with the ordinary zinc anode, due to the improvement of the film quality, the zinc anode after cycling has no dendrites. , exhibiting a flat, compact surface.

[0038] like Figure 9 As shown, due ...

Embodiment 3

[0040] The rest of the conditions are the same as in Example 1, except that the soaking time of the zinc foil is changed to 30 min.

[0041] like image 3 As shown in the figure, due to the excessively long film formation time of the modified zinc negative electrode obtained in this example, part of the passivation layer begins to accumulate and fall off, exposing the underlying zinc substrate.

[0042] like Image 6 As shown, due to the detachment of the passivation layer, the cycle life of the modified zinc anode obtained in this example was reduced, and a short circuit occurred after 400 hours of operation.

[0043] To sum up, compared with the prior art, the beneficial effects of the present invention are:

[0044] (1) The present invention constructs a layer of chemical passivation layer on the surface of the metal zinc negative electrode in situ, with uniform thickness and continuous film layer, which can effectively coat the zinc negative electrode, isolate water and ...

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Abstract

The invention discloses a metal zinc negative electrode protected by a chemical passivation layer. The chemical passivation layer is generated on the surface of the zinc metal negative electrode in situ through a chemical passivation method. The active component of the passivation solution used in the chemical passivation method is one or more of vanadate, silicate and titanate, and the solvent is water. The invention further discloses a corresponding preparation method. Therefore, the inventor also develops a corresponding aqueous zinc ion battery, and the passivation layer is uniformly distributed, so that water and oxygen can be effectively isolated, the aqueous zinc ion battery has an anti-corrosion characteristic, and hydrogen evolution side reaction of a zinc negative electrode in charge-discharge circulation is inhibited; meanwhile, the zinc negative electrode can induce uniform deposition of zinc and inhibit growth of dendritic crystals, the cycle performance of the zinc negative electrode is remarkably improved, and the cycle stability of the zinc negative electrode is improved. In short, the zinc metal negative electrode is simple in production process and low in raw material cost, and the obtained battery product is good in effect and suitable for large-scale production.

Description

technical field [0001] The invention belongs to the technical field of battery material preparation, in particular to a metal zinc negative electrode protected by a chemical passivation layer and a preparation method and application thereof. Background technique [0002] The development of human society is accompanied by the continuous increase of energy demand. The huge pollution caused by traditional fossil fuels to the environment has prompted people to turn their attention to new renewable energy sources such as wind energy, solar energy, and tidal energy. , discontinuity and uncontrollability greatly limit its availability. Therefore, it is necessary to develop an energy storage system to effectively store and convert these intermittent energy sources. Among them, lithium-ion batteries have been widely used in portable electronic devices and electric vehicles due to their high output voltage and high energy density. However, the scarcity of lithium resources and the fl...

Claims

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Application Information

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IPC IPC(8): H01M4/02H01M4/04H01M4/38H01M10/36H01M10/42C23C22/40C23C22/53C23C22/73
CPCH01M4/38H01M4/02H01M4/04H01M10/36H01M10/4235C23C22/53C23C22/40C23C22/73
Inventor 何会兵秦弘宇黄燕平胡楠易力
Owner GUANGXI UNIV
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