CN113381081A - Water-system zinc ion energy storage device - Google Patents
Water-system zinc ion energy storage device Download PDFInfo
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- CN113381081A CN113381081A CN202110602726.2A CN202110602726A CN113381081A CN 113381081 A CN113381081 A CN 113381081A CN 202110602726 A CN202110602726 A CN 202110602726A CN 113381081 A CN113381081 A CN 113381081A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/36—Accumulators not provided for in groups H01M10/05-H01M10/34
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/4235—Safety or regulating additives or arrangements in electrodes, separators or electrolyte
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M2300/00—Electrolytes
- H01M2300/0002—Aqueous electrolytes
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The invention belongs to the field of energy storage devices, and particularly relates to a water-based zinc ion energy storage device which comprises a positive electrode, a negative electrode, an isolating membrane and electrolyte, wherein the electrolyte comprises a solvent and a solute, the electrolyte also comprises an additive, and the additive is a water-soluble chelating agent. Compared with the prior art, the low-cost chelating agent additive is added into the zinc salt electrolyte of the secondary battery system, so that on one hand, chelating molecules can be adsorbed on the surface of a negative electrode, the side reaction between active metal and the electrolyte is inhibited, and the corrosion resistance is improved; on the other hand, zinc ions on the surface are more difficult to be separated from the chelating agent for deposition, the deposition overpotential is increased, active metals are promoted to have more uniform deposition sites in the deposition process, meanwhile, water-soluble chelating agent molecules are adsorbed on the surface of the zinc cathode, so that local charges on the surface can be uniform, and the metal cathode without dendritic crystals is obtained.
Description
Technical Field
The invention belongs to the technical field of energy storage devices, and particularly relates to a water system zinc ion energy storage device.
Background
At present, ZnSO4Is a relatively suitable cheap zinc salt, and the aqueous solution is formed by Zn2+The hydrolysis of (b) shows weak acidity, and is widely used in secondary water-based zinc ion batteries. However, in the aqueous electrolyte, Zn is contained2+And H2Strong solvation effect exists between O molecules, so that Zn is ensured2+The desolvation needs to jump higher energy barrier to get Zn2+From zinc sulphate-hydrated ionic associate ([ Zn (H) ]2O)6 2+SO4 2-]) The process of zinc deposition proceeds out of the solvating sheath, which in turn results in low coulombic efficiency for the zinc cathode. At the same time, Zn2+During the desolvation process of the cathode interface, a large amount of active water molecules are released on the cathode surface, so that the side reaction of the cathode surface is intensified, the local pH value is increased, and the permanent loss of the electrolyte is caused. Many measures have therefore been devoted to the conversion of Zn2+The angle of desolvation of (a) lowers the reaction energy barrier. The luxurious team utilized the construction of a hydrophobic Metal Organic Framework (MOF) layer on the surface of the negative electrode for the purpose of maintaining a supersaturated electrolyte layer on the surface of the negative electrode, and they found that the high coordination number zinc ion complexes migrating in the MOF channels are different from the solvation structure in the bulk electrolyte by in situ raman spectroscopy, indicating that the solvation sheath is continuously desolvated during the process of reaching the zinc negative electrode, forming a gradient concentration layer (Yang H, Chang Z, Qiao Y, et al]Angewandte Chemie-International Edition,2020,59(24): 9377-9381.). Based on this principle, the side reaction is greatly reduced, and generation of dendrite is suppressed. The effect of such a coated rigid protective layer, however, has its inherent disadvantage for long-term use, namely irreversible destruction of the protective layer. Based on the desolvation concept, more and more researchers are beginning to look at the design of electrolyte additives. However, the desolvation of the electrolyte additive reported at present is not complete, and a small amount of free water molecules with high activity are still released at the negative electrode to induce side reactions.
Under the circumstances, through the intensive research and day and night diligent research of the inventor, the invention provides an aqueous zinc ion energy storage device, a water-soluble chelating agent is innovatively added into an electrolyte, the additive is adsorbed on the surface of a negative electrode to continuously generate the effects of resisting corrosion and inhibiting dendrites, and the effects of the regularization morphology and the corrosion resistance are dynamically sustainable, so that the corrosion-resistant metal negative electrode without dendrites and with long service life is realized.
Disclosure of Invention
The invention aims to: aiming at the defects of the prior art, the low-cost chelate additive is provided for the electrolyte of the water system zinc ion energy storage device so as to realize the corrosion-resistant metal cathode without dendrite and with long service life.
In order to achieve the purpose, the invention adopts the following technical scheme:
a water system zinc ion energy storage device comprises a positive electrode, a negative electrode, an isolating membrane and electrolyte, wherein the electrolyte comprises a solvent and a solute, the electrolyte further comprises an additive, and the additive is a water-soluble chelating agent.
As an improvement of the water system zinc ion energy storage device, the water-soluble chelating agent is at least one of salt solutions of EDTA, NTA, DTPA, HEDTA, succinic acid, salicylic acid, oxalic acid, acetic acid and glycine, and the salt solution is a sodium salt solution or a potassium salt solution.
As an improvement of the water-based zinc ion energy storage device, the concentration of the additive in the electrolyte is 0.001-0.100M. Too high a concentration tends to precipitate Zn-water soluble chelating agent.
As an improvement of the water system zinc ion energy storage device, the solute is ZnSO4、ZnCl2、Zn(ClO4)2、Zn(CF3SO3)2、Zn(NO3)2And (CH)3COO)2At least one of Zn.
As an improvement of the water system zinc ion energy storage device, the solvent is one of deionized water, distilled water, seawater and brine.
As an improvement of the water system zinc ion energy storage device, the negative electrode is dense metal zinc foil, porous zinc metal mesh or three-dimensional zinc metal foam.
As an improvement of the aqueous zinc ion energy storage device of the present invention, the positive electrode includes a conductive substrate and an active material.
As an improvement of the water-based zinc ion energy storage device, the active material is a vanadium-based or manganese-based material, and the conductive substrate is one of carbon paper, carbon cloth, foamed nickel, stainless steel foil, titanium foil and the like.
As an improvement of the aqueous zinc ion energy storage device, the aqueous zinc ion energy storage device is an aqueous zinc ion battery or a zinc ion capacitor, and the current density of the aqueous zinc ion battery is 0.5-15A/g; the current density of the zinc ion capacitor is 0.5-20A/g.
As an improvement of the water system zinc ion energy storage device, the preparation method of the energy storage device comprises the following steps:
firstly, preprocessing a zinc metal sheet: cleaning the zinc metal sheet with deionized water or ethanol to remove impurities, and drying after cleaning to obtain a pretreated zinc metal sheet; the thickness of the active metal sheet is 0.001mm-50 mm.
Secondly, preparing an electrolyte containing zinc salt, and fully and uniformly shaking the electrolyte for later use;
thirdly, weighing water-soluble chelating agent powder, adding the water-soluble chelating agent powder into the electrolyte obtained in the second step, and fully dissolving to obtain electrolyte containing a chelating agent additive;
and fourthly, assembling the positive electrode, the negative electrode, the isolating membrane and the electrolyte into the battery.
Compared with the prior art, the low-cost chelating agent additive is added into the zinc salt electrolyte of the secondary battery system, so that on one hand, chelating molecules can be adsorbed on the surface of a negative electrode, the side reaction between active metal and the electrolyte is inhibited, and the corrosion resistance is improved; on the other hand, zinc ions on the surface are more difficult to be separated from the chelating agent for deposition, the deposition overpotential is increased, active metals are promoted to have more uniform deposition sites in the deposition process, meanwhile, water-soluble chelating agent molecules are adsorbed on the surface of the zinc cathode, so that local charges on the surface can be uniform, and the metal cathode without dendritic crystals is obtained. The electrolyte additive is applied to the field of energy storage, can give full play to the advantages of high capacity and low potential of a metal cathode, and endows the metal cathode with the characteristics of corrosion resistance, no dendrite and long service life, thereby obtaining a high-performance zinc ion battery or a zinc ion capacitor. In a word, the zinc negative electrode which is resistant to water corrosion, free of dendrite and long in service life is obtained by completely desolvating the zinc ions through the action of the chelating agent.
That is, the present invention innovatively adds a water-soluble chelating agent to an aqueous electrolyte solution to improve the stability of an aqueous zinc-ion battery and suppress the occurrence of side reactions, and has the following main advantages compared with the conventional strategies such as artificial SEI or construction of a negative electrode protection layer: the additive is adsorbed on the surface of the negative electrode to continuously generate the effects of resisting corrosion and dendrites, the regularized morphology and the corrosion resisting effect are dynamically sustainable, and the artificial SEI or the constructed protective layer gradually loses the protective effect once being damaged. In addition, the addition of water-soluble chelating agent can generate chelation with zinc ions to destroy Zn2+The solvation structure realizes complete desolvation, further inhibits hydrogen evolution and corrosion reaction, and simultaneously changes Zn2+The zinc cathode without dendrites is formed by the deposition orientation, and the low-temperature stability and the service life of the battery are improved.
Drawings
The invention and its advantageous effects are explained in detail below with reference to the accompanying drawings and the detailed description.
Fig. 1 is an SEM image of a zinc metal sheet obtained after cleaning and drying in example 1 of the present invention.
FIG. 2 is a drawing showing the zinc flakes after the first step of treatment in example 1 of the present invention in 2M ZnSO4SEM images after one week of soaking in solution.
FIG. 3 is an SEM image of a zinc sheet after being treated in the first step of the invention in example 1, after being soaked in an electrolyte containing 0.05M EDTA chelating agent for one week.
Fig. 4 is an XRD pattern of the zinc sheet after the first step treatment in the electrolyte containing 0.05M EDTA chelating agent for one week in example 1 of the present invention.
FIG. 5 shows the results of testing the symmetrical cells of example 1 of the present invention and comparative example 1 (current density of 5mA cm)-2)。
FIG. 6 shows examples 1 of the present invention and comparative example 1Test results for symmetrical cells (Current Density 20mA cm)-2)。
Fig. 7 is an SEM image of zinc sheets after disassembly of an EDTA-free cell of comparative example 2 of the present invention.
Fig. 8 is an SEM image of zinc sheets after disassembling EDTA-containing cells of example 2 of the present invention.
Detailed Description
The technical solutions of the present invention are described below with specific examples, but the scope of the present invention is not limited thereto.
Example 1
The embodiment provides an aqueous zinc ion battery, which comprises a positive electrode, a negative electrode, a separation film and electrolyte, wherein the electrolyte comprises a solvent and a solute, and the electrolyte further comprises a water-soluble chelating agent EDTA sodium salt with the concentration of 0.05M. The solute is ZnSO4And the solvent is deionized water. The cathode is a dense metal zinc foil, the anode comprises a conductive substrate and an active material, wherein the active material is MnO2The conductive substrate is carbon paper.
The preparation method of the water-based zinc ion battery comprises the following steps:
the first step is as follows: pretreatment of zinc metal sheets: the zinc metal sheet with the thickness of 0.1mm is ultrasonically cleaned for three times by deionized water and absolute ethyl alcohol respectively, the ultrasonic cleaning is carried out for 10min each time, and then the zinc metal sheet is placed in a blast oven at the temperature of 70 ℃ for drying. And (3) punching the dried metal sheet into a zinc metal wafer with the diameter of 10mm by using a tablet machine for standby. An SEM image of the metal zinc sheet obtained after the first step of cleaning and drying is shown in figure 1, and the metal zinc sheet has a smooth surface and no obvious granular feeling.
The second step is that: preparation of ZnSO4Electrolyte solution: 100mL of 2M ZnSO was prepared in a 100mL volumetric flask with deionized water4And fully shaking the electrolyte uniformly for later use.
The third step: preparing an electrolyte containing an EDTA chelating agent: weighing 0.05M EDTA sodium salt chelating agent powder, adding into a small beaker, and taking a proper amount of the ZnSO4The electrolyte sufficiently dissolves the EDTA sodium salt powder. The mixture was transferred to a 10mL volumetric flask and the above ZnSO was used4And (5) fixing the volume of the electrolyte. After sufficient shaking, a novel electrolyte containing 0.05M of EDTA sodium salt additive was prepared.
The fourth step: the metal zinc sheet after the first step of treatment is placed in 2M ZnSO4After being soaked in the solution for one week, the surface topography is shown in figure 2. As can be seen from figure 2, a plurality of flaky byproducts with the sizes ranging from several micrometers to dozens of micrometers appear on the surface of the metal zinc, and the XRD test detection result proves that the corrosion product is basic zinc sulfate.
The fifth step: the zinc sheet after the first step of treatment is soaked in an electrolyte containing 0.05M EDTA chelating agent for one week, and the surface appearance is shown in FIG. 3. As can be seen from fig. 3, the surface of the metallic zinc still remained relatively smooth, and the presence of flake-like basic zinc sulfate, which is a corrosion by-product, was not observed. The XRD test detection result proves that no basic zinc sulfate is generated on the zinc oxide powder, which indicates that the zinc corrosion reaction is obviously inhibited. As shown in fig. 4, the characteristic peak appearing around 2 θ ═ 8 ° is the characteristic peak of basic zinc sulfate.
And a sixth step: the zinc sheet is used as a positive electrode and a negative electrode to assemble a symmetrical battery, the electrolyte is an electrolyte containing 0.05M EDTA chelating agent, and the comparison sample is pure ZnSO without EDTA4The electrolyte of (1) (this is comparative example). The current density of the symmetrical battery test is 5mA cm-2As shown in fig. 5, the test results show that the symmetrical battery assembled by the EDTA-containing electrolyte can stably circulate for 35000 minutes, and the symmetrical battery assembled by the EDTA-free electrolyte can only circulate 8000 minutes and cannot work. The current density of the symmetrical battery test is 20mA cm-2As shown in fig. 6, the test results show that the electrolyte containing EDTA can stably circulate for 500 hours, and the electrolyte containing no EDTA can circulate for only 50 hours, so that the symmetrical battery cannot work.
Example 2
The embodiment provides an aqueous zinc ion battery, which comprises a positive electrode, a negative electrode, a separation film and electrolyte, wherein the electrolyte comprises a solvent and a solute, and the electrolyte further comprises a water-soluble chelating agent EDTA sodium salt with the concentration of 0.05M. The solute is ZnSO4And the solvent is deionized water. The cathode is a dense metal zinc foil, the anode comprises a conductive substrate and an active material, wherein the active material is V2O5The conductive substrate is carbon paper.
The preparation method of the water system zinc ion battery comprises the following steps:
the first step is as follows: pretreatment of zinc metal sheets: the zinc metal sheet with the thickness of 0.1mm is ultrasonically cleaned for three times by deionized water and absolute ethyl alcohol respectively, the ultrasonic cleaning is carried out for 10min each time, and then the zinc metal sheet is placed in a blast oven at the temperature of 70 ℃ for drying. And (3) punching the dried metal sheet into a zinc metal wafer with the diameter of 10mm by using a tablet machine for standby, wherein the surface is smooth and has no obvious granular feeling.
The second step is that: preparation of ZnSO4Electrolyte solution: preparing 100mL of 2M ZnSO by using natural seawater in a 100mL volumetric flask4And (3) fully shaking and uniformly shaking the seawater-based electrolyte for later use.
The third step: preparing a seawater-based electrolyte containing an EDTA chelating agent: weighing 0.05M EDTA sodium salt chelating agent powder, adding into a small beaker, and taking a proper amount of the ZnSO4The seawater-based electrolyte fully dissolves the EDTA sodium salt powder. The mixture was transferred to a 10mL volumetric flask and the above ZnSO was used4And (4) fixing the volume of the seawater-based electrolyte. After sufficient shaking, a novel seawater-based electrolyte containing 0.05M of EDTA sodium salt additive is prepared.
The fourth step: the zinc sheet is used as a negative electrode, V2O5Coating on carbon paper with diameter of 10mm as anode, and assembling Zn/V together2O5The electrolyte is seawater-based electrolyte containing 0.05M EDTA chelating agent, and the comparative sample is pure ZnSO without EDTA4Seawater based electrolyte (this is comparative example 2). The current density tested was 1Ag-1After 100 cycles, the cell was disassembled and the corrosion of the zinc cathode was observed by SEM. As shown in fig. 6, the zinc sheet surface of the symmetrical battery assembled by the EDTA-free electrolyte is full of ravines and organ-shaped byproducts, and as shown in fig. 7, the zinc sheet surface of the symmetrical battery assembled by the EDTA-free electrolyte is relatively flat and almost no organ-shaped byproducts are generated.
Example 3
The embodiment provides an aqueous zinc ion battery, which comprises a positive electrode, a negative electrode, a separation membrane and electrolyte, wherein the electrolyte comprises a solvent and a solute, and the electrolyte further comprises a water-soluble chelating agent NTA sodium salt with the concentration of 0.07M. The solute being ZnCl2The solvent is seawater. The negative electrode is a porous zinc metal mesh, and the positive electrode comprises a conductive substrate and an active material, wherein the active material is V2O5The conductive substrate is carbon cloth.
Example 4
The embodiment provides an aqueous zinc ion battery, which comprises a positive electrode, a negative electrode, a separation membrane and electrolyte, wherein the electrolyte comprises a solvent and a solute, and the electrolyte further comprises a water-soluble chelating agent DTPA sodium salt with the concentration of 0.03M. The solute is Zn (ClO)4)2The solvent is distilled water. The negative electrode is three-dimensional zinc metal foam, and the positive electrode comprises a conductive substrate and an active material, wherein the active material is V2O5The conductive substrate is foamed nickel.
Example 5
The embodiment provides an aqueous zinc ion battery, which comprises a positive electrode, a negative electrode, a separation membrane and electrolyte, wherein the electrolyte comprises a solvent and a solute, and the electrolyte further comprises a water-soluble chelating agent HEDTA potassium salt with the concentration of 0.05M. The solute is Zn (CF)3SO3)2And the solvent is saline. The cathode is a dense metal zinc foil, the anode comprises a conductive substrate and an active material, wherein the active material is MnO2The conductive substrate is stainless steel foil.
Example 6
The embodiment provides an aqueous zinc ion battery, which comprises a positive electrode, a negative electrode, a separation membrane and an electrolyte, wherein the electrolyte comprises a solvent and a solute, and the electrolyte further comprises a water-soluble chelating agent potassium succinate with the concentration of 0.005M. The solute is Zn (NO)3)2And the solvent is deionized water. The cathode is a dense metal zinc foil, the anode comprises a conductive substrate and an active material, wherein the active material is MnO2The conductive substrate is titanium foil.
Example 7
The embodiment provides an aqueous zinc ion battery, which comprises a positive electrode, a negative electrode, a separation membrane and electrolyte, wherein the electrolyte comprises a solvent and a solute, and the electrolyte further comprises a water-soluble chelating agent potassium salicylate with the concentration of 0.01M. The solute is (CH)3COO)2Zn, and the solvent is distilled water. Negative electrodeIs a porous zinc metal mesh, the positive electrode comprises a conductive substrate and an active material, wherein the active material is MnO2The conductive substrate is carbon paper.
Example 8
The embodiment provides an aqueous zinc ion battery, which comprises a positive electrode, a negative electrode, a separation membrane and electrolyte, wherein the electrolyte comprises a solvent and a solute, and the electrolyte further comprises a water-soluble chelating agent sodium oxalate salt with the concentration of 0.01M. The solute is ZnSO4The solvent is distilled water. The negative electrode is a porous zinc metal mesh, and the positive electrode comprises a conductive substrate and an active material, wherein the active material is MnO2The conductive substrate is carbon cloth.
Example 9
The embodiment provides an aqueous zinc ion battery, which comprises a positive electrode, a negative electrode, a separation membrane and an electrolyte, wherein the electrolyte comprises a solvent and a solute, and the electrolyte further comprises a water-soluble chelating agent sodium acetate salt with the concentration of 0.045M. The solute being ZnCl2The solvent is distilled water. The negative electrode is a porous zinc metal mesh, and the positive electrode comprises a conductive substrate and an active material, wherein the active material is MnO2The conductive substrate is foamed nickel.
Example 10
The embodiment provides an aqueous zinc ion battery, which comprises a positive electrode, a negative electrode, a separation film and electrolyte, wherein the electrolyte comprises a solvent and a solute, and the electrolyte further comprises a water-soluble chelating agent glycine sodium salt with the concentration of 0.045M. The solute is ZnSO4The solvent is distilled water. The negative electrode is a porous zinc metal mesh, and the positive electrode comprises a conductive substrate and an active material, wherein the active material is MnO2The conductive substrate is foamed nickel.
Variations and modifications to the above-described embodiments may occur to those skilled in the art, which fall within the scope and spirit of the above description. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and some modifications and variations of the present invention should fall within the scope of the claims of the present invention. Furthermore, although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.
Claims (10)
1. The utility model provides a system zinc ion energy storage device, includes positive pole, negative pole, barrier film and electrolyte, electrolyte includes solvent and solute, its characterized in that: the electrolyte also comprises an additive which is a water-soluble chelating agent.
2. The aqueous zinc ion energy storage device of claim 1, wherein: the water-soluble chelating agent is at least one of salt solutions of EDTA, NTA, DTPA, HEDTA, succinic acid, salicylic acid, oxalic acid, acetic acid and glycine, and the salt solution is a sodium salt solution or a potassium salt solution.
3. The aqueous zinc ion energy storage device of claim 1, wherein: in the electrolyte, the concentration of the additive is 0.001-0.100M.
4. The aqueous zinc ion energy storage device of claim 1, wherein: the solute is ZnSO4、ZnCl2、Zn(ClO4)2、Zn(CF3SO3)2、Zn(NO3)2And (CH)3COO)2At least one of Zn.
5. The aqueous zinc ion energy storage device of claim 1, wherein: the solvent is one of deionized water, distilled water, seawater and brine.
6. The aqueous zinc ion energy storage device of claim 1, wherein: the negative electrode is a compact metal zinc foil, a porous zinc metal mesh and three-dimensional zinc metal foam.
7. The aqueous zinc ion energy storage device of claim 1, wherein: the positive electrode includes a conductive substrate and an active material.
8. The aqueous zinc ion energy storage device of claim 1, wherein: the active material is a vanadium-based or manganese-based material, and the conductive substrate is one of carbon paper, carbon cloth, foamed nickel, stainless steel foil, titanium foil and the like.
9. The aqueous zinc ion energy storage device of claim 1, wherein: the water system zinc ion energy storage device is a water system zinc ion battery or a zinc ion capacitor.
10. The aqueous zinc ion energy storage device of claim 1, wherein: the preparation method of the energy storage device comprises the following steps:
firstly, preprocessing a zinc metal sheet: cleaning the zinc metal sheet with deionized water or ethanol to remove impurities, and drying after cleaning to obtain a pretreated zinc metal sheet;
secondly, preparing an electrolyte containing zinc salt, and fully and uniformly shaking the electrolyte for later use;
thirdly, weighing water-soluble chelating agent powder, adding the water-soluble chelating agent powder into the electrolyte obtained in the second step, and fully dissolving to obtain electrolyte containing a chelating agent additive;
and fourthly, assembling the positive electrode, the negative electrode, the isolating membrane and the electrolyte into the battery.
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| CN114824152A (en) * | 2022-03-30 | 2022-07-29 | 南京工业大学 | Preparation method and application of zinc cathode modified by metal complex |
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Application publication date: 20210910 |