Silver peroxide positive electrode for high-energy-density metal fuel cell and preparation method of silver peroxide positive electrode

Abstract

The invention discloses a silver peroxide electrode for a high-energy-density metal fuel cell and a preparation method of the silver peroxide electrode. The preparation method comprises the following steps: firstly, pretreating foam metal to remove oil stains and surface oxides, and drying after treatment; then mixing high-purity silver peroxide powder to prepare slurry, uniformly filling the slurry into pores of the three-dimensional structure of the pretreated foam metal in a gradient manner by adopting a multi-time vacuum impregnation technology, and then drying under a vacuum condition; and finally, constructing a densified electrode through a compression molding technology to prepare the silver peroxide positive electrode material with a pore channel structure. The three-dimensional continuous conductive network of the foam metal is utilized to ensure stable electron transmission under high current density, and the utilization rate and the specific capacity of the silver peroxide electrode active material are improved. The preparation process of the silver peroxide electrode material is simplified through the integrated process of ultrasonic purification, vacuum impregnation, gradient loading and interface pressing, and the electrochemical performance of the silver peroxide electrode is remarkably improved.

Description

Technical Field

[0001] The present invention relates to the technical field of new energy battery materials, and in particular to a highly active silver peroxide (AgO) positive electrode for a high-energy-density metal fuel cell and a preparation method thereof. Background Art

[0002] Aluminum / silver peroxide (Al / AgO) is a metal fuel cell with high energy density, boasting a theoretical energy density of 1090Wh / kg. This battery also boasts significant advantages, including stable discharge voltage, high power density, and excellent high-current discharge performance. It has gained significant attention in the field of seawater-activated batteries and has achieved large-scale practical application. As the core material for the battery's positive electrode, the AgO electrode is crucial to its service performance and widespread application. Improving the activity and utilization of the AgO electrode is a key technology for breaking through the performance bottleneck of Al / AgO batteries.

[0003] In terms of electrode current collector technology, traditional Al / AgO batteries use a two-dimensional mesh (silver-plated copper mesh and silver mesh) structure for current collection, which is in surface contact with the active material AgO in a two-dimensional structure. The use of a porous foam mesh structure metal current collector can more efficiently load the active material AgO through its three-dimensional pore structure (porosity > 95%) and large specific surface area. It can also optimize the charge transfer path through the three-dimensional conductive grid, and the current collection efficiency is significantly improved compared to the two-dimensional structure.

[0004] AgO cathode materials are limited by their thermal instability, making it impossible to achieve interfacial metallurgical bonding with the current collector through a sintering process. Instead, AgO powder must be formulated into a slurry using a binder (such as sodium carboxymethyl cellulose (CMC), polytetrafluoroethylene (PTFE), or polyvinylidene fluoride (PVDF)). This process has two drawbacks: on the one hand, the binder covers the active sites of AgO involved in the electrochemical reaction, resulting in increased electrode internal resistance and decreased electrochemical activity; on the other hand, the coating process significantly increases production costs and reduces process efficiency. Therefore, developing binder-free AgO electrode material preparation technology is key to improving the performance of metal fuel cells.

[0005] To address the above problems, the present invention innovatively adopts a three-dimensional porous foam network structure of the metal current collector, directly adding the binder-free AgO into it to prepare the battery positive electrode. The AgO electrode prepared by this method does not contain traditional organic binders and conductive agents, etc., ensuring the high purity of AgO, thereby improving the overall electrochemical reaction activity of AgO. At the same time, through the structural design and interface optimization between AgO and the porous foam network current collector, the efficient combination of active AgO and the current collector is achieved, further improving the service characteristics of the electrode material during the discharge process. The present invention simplifies the preparation process of the AgO electrode material and significantly improves the electrochemical performance of the AgO electrode. Summary of the Invention

[0006] The present invention aims to develop a method for preparing a silver peroxide positive electrode suitable for high-energy-density metal fuel cells. The core advantages of this technological innovation lie in the absence of a binder and the use of a high-temperature sintering process, effectively maintaining the electrochemical reactivity of the silver peroxide. The use of a three-dimensional porous foam mesh metal current collector optimizes the charge transfer path and significantly improves current collection efficiency. The overall utilization rate of the silver peroxide active material in the electrode is increased by over 15%. Furthermore, this method features a short process flow and excellent stability, providing a practical and feasible technical solution for the large-scale production of silver peroxide electrodes.

[0007] The technical solutions adopted in the present invention are as follows:

[0008] A method for preparing a silver peroxide cathode material for a high energy density metal fuel cell comprises the following steps:

[0009] Step S1: Current collector pretreatment

[0010] A foam metal substrate with a three-dimensional porous structure is selected and ultrasonically cleaned in anhydrous ethanol, acetone, or deionized water for 0.5 to 1 hour to remove surface oil and oxide layers, followed by drying at a temperature range of 30 to 100°C for 1 to 5 hours to obtain a clean current collector;

[0011] Step S2: Slurry preparation

[0012] AgO powder with an average particle size of 10 nm to 50 μm and a purity of 80% to 99% is mixed with a solvent in a ratio of 1:1, and stirred at room temperature for 0.5 to 1 h to form a uniformly dispersed active AgO slurry system;

[0013] Step S3: Gradient loading

[0014] The AgO slurry is filled into the foam metal substrate current collector with a three-dimensional porous structure using vacuum impregnation technology, and then dried for 2 to 12 hours in a vacuum environment at 30 to 60°C, with a vacuum environment pressure of less than 133 Pa, to achieve preliminary bonding between the active material and the current collector; the vacuum impregnation process is repeated 1 to 3 times to ensure that the AgO slurry is filled sufficiently to fill the foam metal current collector with a three-dimensional porous structure.

[0015] Step S4: Interface strengthening

[0016] The three-dimensional porous foam metal current collector with AgO added is placed in a precision press mold and a pressure of 50-550 MPa is applied for 1-10 minutes to construct a densified electrode structure through compression molding technology.

[0017] Step S5: Finished product refining

[0018] The surface of the pressed electrode is scraped to remove the floating powder, and the final filling density is 0.1~1g / cm 3 , AgO positive electrode materials with pore structures of different scales.

[0019] Preferably, the foam metal substrate is one of foam nickel, foam silver, silver-plated foam nickel, foam gold, and gold-plated foam nickel.

[0020] Preferably, the solvent in step S2 is one of anhydrous ethanol, acetone, and deionized water.

[0021] A silver peroxide positive electrode material for a high energy density metal fuel cell is prepared by the above method.

[0022] The beneficial effects of the present invention are as follows:

[0023] The present invention innovatively adopts a metal current collector with a three-dimensional porous foam network structure, and directly adds adhesive-free AgO into it to prepare the battery positive electrode. This method does not contain traditional organic binders and conductive agents, etc., which ensures the high purity of AgO, thereby improving the overall electrochemical reaction activity of AgO. In the process design process, through the structural design and interface optimization between AgO and the porous foam network current collector, vacuum impregnation is combined with multiple loading, i.e. gradient loading and interface strengthening to achieve efficient combination of active AgO and current collector, further improving the service characteristics of the electrode material during the discharge process. The present invention significantly improves the electrochemical performance of the AgO electrode through the integrated process of "ultrasonic purification-vacuum impregnation-gradient loading-interface pressing". BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0025] Figure 1 This is a morphology diagram of the foam metal current collector used in Example 1 of the present invention;

[0026] Figure 2 This is the morphology of the AgO positive electrode material prepared in Example 1 of the present invention before discharge;

[0027] Figure 3 This is a cross-sectional morphology of the AgO positive electrode material prepared in Example 1 of the present invention after discharge;

[0028] Figure 4 This is a discharge curve diagram of an Al / AgO battery assembled with the AgO positive electrode material prepared in Example 1 of the present invention and an aluminum negative electrode. DETAILED DESCRIPTION

[0029] In order to enable those skilled in the art to better understand the technical solutions in the embodiments of the present invention and to make the above-mentioned objects, features and advantages of the present invention more obvious and understandable, the specific implementation methods of the present invention are further described below.

[0030] The endpoints of the ranges and any values ​​disclosed herein are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoints of each range, the endpoints of each range and individual point values, and the individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered as specifically disclosed herein.

[0031] Example 1:

[0032] A method for preparing a silver peroxide cathode material for a high energy density metal fuel cell comprises the following steps:

[0033] Step S1: Current collector pretreatment

[0034] A nickel foam with a three-dimensional porous structure was selected and ultrasonically cleaned in anhydrous ethanol for 0.5 h to remove surface oil and oxide layers. It was then dried at 60°C for 2 h to obtain a clean current collector.

[0035] Step S2: Slurry preparation

[0036] AgO powder with an average particle size of 3 μm and a purity of 95% was mixed with deionized water in a ratio of 1:1 and stirred at room temperature for 0.8 h to form a uniformly dispersed active AgO slurry system;

[0037] Step S3: Gradient loading

[0038] The AgO slurry was filled into the three-dimensional porous metal foam substrate current collector using vacuum impregnation technology, and then dried for 6 hours in a vacuum environment at 50°C and a vacuum environment pressure of 130Pa to achieve preliminary bonding between the active material and the current collector; the vacuum impregnation process was repeated twice to ensure that the AgO slurry was filled sufficiently to fill the three-dimensional porous metal foam current collector.

[0039] Step S4: Interface strengthening

[0040] The three-dimensional porous metal foam current collector with AgO added was placed in a precision press mold and a pressure of 100 MPa was applied for 5 minutes to construct a densified electrode structure through compression molding technology.

[0041] Step S5: Finished product refining

[0042] The surface of the pressed electrode was scraped to remove the loose powder, and the final filling density was 0.7g / cm 3 , AgO positive electrode materials with pore structures of different scales.

[0043] The AgO cathode material prepared in Example 1 was tested. Figures 1 to 4 ,in Figure 1 This is a morphology diagram of the nickel foam current collector used in Example 1 of the present invention; Figure 2 This is the morphology of the AgO positive electrode material prepared in Example 1 of the present invention before discharge; Figure 3 This is a cross-sectional morphology of the AgO positive electrode material prepared in Example 1 of the present invention after discharge; Figure 4 This is a discharge curve diagram of an Al / AgO battery assembled with the AgO positive electrode material prepared in Example 1 of the present invention and an aluminum alloy negative electrode.

[0044] Figure 1 The morphology of the current collector used in Example 1 was analyzed using a field emission scanning electron microscope. Figure 1 It can be seen that the pores of nickel foam are evenly distributed, providing a good three-dimensional conductive structure for AgO particle filling.

[0045] Figure 2 Field emission scanning electron microscopy was used to characterize the surface morphology of the AgO electrode prepared in Example 1 before discharge. After gradient loading and interface strengthening pressing, the AgO was filled into the pores of the metal foam, and the AgO on the electrode surface had a porous structure, which was conducive to sufficient infiltration of the electrolyte and electrochemical reaction.

[0046] Figure 3 The cross-sectional morphology of the AgO electrode prepared in Example 1 after discharge was characterized using a field emission scanning electron microscope. It can be seen that the silver particles generated after discharge are evenly filled in the foam metal, the current collecting effect of the foam metal is good, and the electrode reaction is relatively sufficient.

[0047] Figure 4 The discharge curve of the AgO electrode prepared in Example 1 is shown in Figure 2. 4.5 mol / L NaOH solution is used as the main electrolyte and the discharge curve is shown in Figure 3. 2At a current density of 1.5V, the battery discharge voltage is stable, and the average discharge voltage is about 1.6V. The energy density is calculated based on the mass of the positive electrode material AgO. When the cut-off voltage is 1V, the discharge energy density of the positive electrode material AgO is 417.9Wh / kg. The electrode specific capacity is calculated based on the mass of the battery active material AgO, and the utilization rate of the battery active material is calculated by comparing it with the theoretical specific capacity of AgO (432mAh / g). At an operating voltage of 1.5V, the specific capacity is 363.3mAh / g, reaching 84% of the theoretical specific capacity; at a cut-off voltage of 1V, the specific capacity is 390.3mAh / g, reaching 90% of the theoretical specific capacity. Therefore, the preparation of AgO electrodes can effectively improve the utilization rate of active materials, the operating voltage and the specific capacity of batteries, and can be used as a high energy density battery positive electrode material.

[0048] Example 2

[0049] A method for preparing a silver peroxide cathode material for a high energy density metal fuel cell comprises the following steps:

[0050] Step S1: Current collector pretreatment

[0051] Silver-plated nickel foam with a three-dimensional porous structure was selected and ultrasonically cleaned in deionized water for 1 hour to remove surface oil and oxide layers. It was then dried at 100°C for 5 hours to obtain a clean current collector.

[0052] Step S2: Slurry preparation

[0053] AgO powder with an average particle size of 50 μm and a purity of 99% was mixed with anhydrous ethanol in a ratio of 1:1 and stirred at room temperature for 1 h to form a uniformly dispersed active AgO slurry system;

[0054] Step S3: Gradient loading

[0055] The AgO slurry was filled into the three-dimensional porous metal foam substrate current collector using vacuum impregnation technology, and then dried for 12 hours in a vacuum environment at 60°C and a vacuum environment pressure of 130Pa to achieve preliminary bonding between the active material and the current collector; the vacuum impregnation process was repeated three times to ensure that the AgO slurry was filled sufficiently to fill the three-dimensional porous metal foam current collector.

[0056] Step S4: Interface strengthening

[0057] The three-dimensional porous metal foam current collector with AgO added was placed in a precision press mold and a pressure of 550 MPa was applied for 10 minutes to construct a densified electrode structure through compression molding technology.

[0058] Step S5: Finished product refining

[0059] The surface of the pressed electrode is scraped to remove the floating powder, and the final filling density is 1g / cm 3 , AgO positive electrode materials with pore structures of different scales.

[0060] The same test method as in Example 1 was used, using 4.5 mol / L NaOH solution as the main electrolyte, and the electrolyte was tested at 620 mA / cm 2 At a current density of 1.5 V, the battery discharge voltage is stable, with an average discharge voltage of approximately 1.5 V. The energy density is calculated based on the mass of the positive electrode material AgO. At a cut-off voltage of 1 V, the discharge energy density of the positive electrode material AgO is 409.8 Wh / kg, making it suitable for use as a high-energy-density battery positive electrode material.

[0061] Example 3

[0062] A method for preparing a silver peroxide cathode material for a high energy density metal fuel cell comprises the following steps:

[0063] Step S1: Current collector pretreatment

[0064] A three-dimensional porous silver foam was selected and ultrasonically cleaned in acetone for 0.5 h to remove surface oil and oxide layers. The current collector was then dried at 30°C for 1 h to obtain a clean one.

[0065] Step S2: Slurry preparation

[0066] AgO powder with an average particle size of 10 nm and a purity of 80% was mixed with a solvent in a ratio of 1:1 and stirred at room temperature for 0.5 h to form a uniformly dispersed active AgO slurry system;

[0067] Step S3: Gradient loading

[0068] The AgO slurry was filled into the three-dimensional porous metal foam substrate current collector using vacuum impregnation technology, and then dried for 2 hours in a vacuum environment at 30°C and a vacuum environment pressure of 130Pa to achieve preliminary bonding between the active material and the current collector; the vacuum impregnation process was repeated once to ensure that the AgO slurry was filled sufficiently to fill the three-dimensional porous metal foam current collector.

[0069] Step S4: Interface strengthening

[0070] The three-dimensional porous foam metal current collector with AgO added was placed in a precision press mold and a pressure of 50 MPa was applied for 1 minute to construct a densified electrode structure through compression molding technology.

[0071] Step S5: Finished product refining

[0072] The surface of the pressed electrode was scraped to remove the floating powder, and the final filling density was 0.1g / cm 3 , AgO positive electrode materials with pore structures of different scales.

[0073] The same test method as in Example 1 was used, using 4.5 mol / L NaOH solution as the main electrolyte, and the electrolyte was tested at 620 mA / cm 2 At a current density of 1.5 V, the battery discharge voltage is stable, with an average discharge voltage of approximately 1.6 V. The energy density is calculated based on the mass of the positive electrode material AgO. At a cut-off voltage of 1 V, the discharge energy density of the positive electrode material AgO is 411.3 Wh / kg, making it suitable for use as a high-energy-density battery positive electrode material.

[0074] Comparative Example 1:

[0075] A method for preparing a silver peroxide cathode material for a high energy density metal fuel cell comprises the following steps:

[0076] Step S1: Current collector pretreatment

[0077] A nickel foam with a three-dimensional porous structure was selected and ultrasonically cleaned in anhydrous ethanol for 0.5 h to remove surface oil and oxide layers. It was then dried at 60°C for 2 h to obtain a clean current collector.

[0078] Step S2: Slurry preparation

[0079] AgO powder with an average particle size of 3 μm and a purity of 95% was mixed with deionized water in a ratio of 1:1 and stirred at room temperature for 0.8 h to form a uniformly dispersed active AgO slurry system;

[0080] Step S3: Gradient loading

[0081] The AgO slurry was filled into the three-dimensional porous structure of the foam metal substrate current collector using the impregnation technology, and then dried for 6 hours under normal atmospheric conditions at room temperature to achieve the initial combination of the active material and the current collector.

[0082] Step S4: Interface strengthening

[0083] The three-dimensional porous foam metal current collector with AgO added was placed in a precision press mold and a pressure of 40 MPa was applied for 5 minutes.

[0084] Step S5: Finished product refining

[0085] The surface of the pressed electrode was scraped to remove the loose powder. At this time, the AgO positive electrode material was not filled evenly, and there was obvious AgO powder shedding visible to the naked eye on the electrode, making it impossible to carry out subsequent discharge experiments.

[0086] Comparative Example 2:

[0087] A method for preparing a silver peroxide cathode material for a high energy density metal fuel cell comprises the following steps:

[0088] Step S1: Current collector pretreatment

[0089] A nickel foam with a three-dimensional porous structure was selected and ultrasonically cleaned in anhydrous ethanol for 0.5 h to remove surface oil and oxide layers. It was then dried at 60°C for 2 h to obtain a clean current collector.

[0090] Step S2: Gradient loading

[0091] AgO powder with an average particle size of 3 μm and a purity of 95% is directly filled without preparing a slurry. The AgO powder is filled into the three-dimensional porous structure of the foam metal substrate current collector, achieving a preliminary bonding between the active material and the current collector under normal temperature and atmospheric conditions. This filling process can be repeated multiple times to ensure that the AgO powder filling is sufficient to fill the three-dimensional porous structure of the foam metal nickel current collector.

[0092] Step S3: Interface strengthening

[0093] The three-dimensional porous metal foam current collector with AgO added was placed in a precision press mold and a pressure of 100 MPa was applied for 5 minutes to construct a densified electrode structure through compression molding technology.

[0094] Step S5: Finished product refining

[0095] The surface of the pressed electrode is scraped to remove the floating powder. At this time, the AgO positive electrode material is loosely filled and will scatter from the foam nickel current collector, making it impossible to carry out subsequent discharge experiments.

[0096] Comparative Example 3:

[0097] A method for preparing a silver peroxide cathode material for a high energy density metal fuel cell comprises the following steps:

[0098] Step S1: Current collector pretreatment

[0099] A nickel foam with a three-dimensional porous structure was selected and ultrasonically cleaned in anhydrous ethanol for 0.5 h to remove surface oil and oxide layers. It was then dried at 60°C for 2 h to obtain a clean current collector.

[0100] Step S2: Slurry preparation

[0101] AgO powder with an average particle size of 3 μm and a purity of 95% was mixed with deionized water in a ratio of 1:1 and stirred at room temperature for 0.8 h to form a uniformly dispersed active AgO slurry system;

[0102] Step S3: Gradient loading

[0103] The AgO slurry was filled into the three-dimensional porous structure of the foam metal substrate current collector by vacuum impregnation technology, and then dried for 6 hours in a vacuum environment at 50 ° C and an ambient pressure of 130 Pa to achieve the initial combination of the active material and the current collector; the vacuum impregnation process was repeated 0 times.

[0104] Step S4: Interface strengthening

[0105] The three-dimensional porous metal foam current collector with AgO added was placed in a precision press mold and a pressure of 100 MPa was applied for 5 minutes to construct a densified electrode structure through compression molding technology.

[0106] Step S5: Finished product refining

[0107] The surface of the pressed electrode was scraped to remove the loose powder, and the final filling density was 0.9g / cm 3 , AgO positive electrode materials with pore structures of different scales.

[0108] The same test method as in Example 1 was used, using 4.5 mol / L NaOH solution as the main electrolyte, and the electrolyte was tested at 620 mA / cm 2 At a current density of 1.5 volts, the average discharge voltage is approximately 1.3 V. The energy density is calculated based on the mass of the positive electrode material AgO. At a cutoff voltage of 1 V, the discharge energy density of the positive electrode material AgO is 338.4 Wh / kg. The electrode material exhibits significant discharge attenuation, exhibiting significant defects compared to electrode materials that have undergone multiple vacuum impregnation cycles.

[0109] Comparative Example 4:

[0110] A method for preparing a silver peroxide cathode material for a high energy density metal fuel cell comprises the following steps:

[0111] Step S1: Current collector pretreatment

[0112] A nickel foam with a three-dimensional porous structure was selected and ultrasonically cleaned in anhydrous ethanol for 0.5 h to remove surface oil and oxide layers. It was then dried at 60°C for 2 h to obtain a clean current collector.

[0113] Step S2: Slurry preparation

[0114] AgO powder with an average particle size of 3 μm and a purity of 95% was mixed with deionized water in a ratio of 1:1 and stirred at room temperature for 0.8 h to form a uniformly dispersed active AgO slurry system;

[0115] Step S3: Gradient loading

[0116] The AgO slurry was filled into the three-dimensional porous metal foam substrate current collector using vacuum impregnation technology, and then dried for 6 hours in a vacuum environment at 50°C and a vacuum environment pressure of 130Pa to achieve preliminary bonding between the active material and the current collector; the vacuum impregnation process was repeated twice to ensure that the AgO slurry was filled sufficiently to fill the three-dimensional porous metal foam current collector.

[0117] Step S4: Interface strengthening

[0118] The electrode material after vacuum impregnation is not subjected to compression interface strengthening treatment.

[0119] Step S5: Finished product refining

[0120] The surface of the pressed electrode was scraped to remove the floating powder, and the final filling density was 0.2g / cm 3 , AgO positive electrode materials with pore structures of different scales.

[0121] The AgO surface of the positive electrode material falls off severely during discharge, the discharge voltage is unstable, the discharge process stops quickly, and the performance of the electrode material cannot meet the use requirements.

[0122] Comparative Example 5:

[0123] A method for preparing a silver peroxide cathode material for a high energy density metal fuel cell comprises the following steps:

[0124] Step S1: Current collector pretreatment

[0125] A nickel foam with a three-dimensional porous structure was selected and ultrasonically cleaned in anhydrous ethanol for 0.5 h to remove surface oil and oxide layers. It was then dried at 60°C for 2 h to obtain a clean current collector.

[0126] Step S2: Slurry preparation

[0127] AgO powder with an average particle size of 3 μm and a purity of 95% was mixed with deionized water in a ratio of 1:1 and stirred at room temperature for 0.8 h to form a uniformly dispersed active AgO slurry system;

[0128] Step S3: Gradient loading

[0129] The AgO slurry was filled into the three-dimensional porous metal foam substrate current collector using vacuum impregnation technology, and then dried for 6 hours in a vacuum environment at 50°C and a vacuum environment pressure of 130Pa to achieve preliminary bonding between the active material and the current collector; the vacuum impregnation process was repeated twice to ensure that the AgO slurry was filled sufficiently to fill the three-dimensional porous metal foam current collector.

[0130] Step S4: Interface strengthening

[0131] The three-dimensional porous metal foam current collector with AgO added was placed in a precision press mold and a pressure of 600 MPa was applied for 5 minutes to construct a densified electrode structure through compression molding technology.

[0132] Step S5: Finished product refining

[0133] The surface of the pressed electrode was scraped to remove the loose powder, and the final filling density was 0.9g / cm 3 , AgO positive electrode materials with pore structures of different scales.

[0134] Excessive pressing pressure will cause the three-dimensional structure of the foam metal to break, and tiny cracks visible to the naked eye will appear in the electrode material. The electrode material will be disconnected, making subsequent discharge tests impossible.

[0135] The embodiments of the present invention are described in detail above, but the present invention is not limited to the described embodiments. It is apparent to those skilled in the art that various changes, modifications, substitutions, and variations made to these embodiments without departing from the principles and spirit of the present invention are still within the scope of protection of the present invention.

Claims

1. A method for preparing a silver peroxide cathode material for a high energy density metal fuel cell, characterized in that: The process steps include: Step S1: Current collector pretreatment A foam metal substrate with a three-dimensional porous structure is selected and ultrasonically cleaned in anhydrous ethanol, acetone, or deionized water for 0.5 to 1 hour to remove surface oil and oxide layers, followed by drying at a temperature range of 30 to 100°C for 1 to 5 hours to obtain a clean current collector; Step S2: Slurry preparation AgO powder with an average particle size of 10 nm to 50 μm and a purity of 80% to 99% is mixed with a solvent in a ratio of 1:1, and stirred at room temperature for 0.5 to 1 h to form a uniformly dispersed active AgO slurry system; Step S3: Gradient loading The AgO slurry is filled into the three-dimensional porous metal foam current collector using a vacuum impregnation technique, and then dried for 2 to 12 hours in a vacuum environment at 30 to 60°C, with a vacuum pressure of less than 133 Pa, to achieve a preliminary combination of the active material and the current collector. The vacuum impregnation process is repeated 1 to 3 times to ensure that the AgO slurry is sufficiently filled to fill the three-dimensional porous metal foam current collector. Step S4: Interface strengthening The three-dimensional porous foam metal current collector with AgO added is placed in a precision press mold and a pressure of 50-550 MPa is applied for 1-10 minutes to construct a densified electrode structure through compression molding technology. Step S5: Finished product refining The surface of the pressed electrode is scraped to remove the floating powder, and the final filling density is 0.1~1g / cm 3 , AgO positive electrode materials with pore structures of different scales.

2. A method for preparing the silver peroxide cathode material for a high energy density metal fuel cell according to claim 1, characterized in that: The foam metal substrate is one or more of foam nickel, foam silver, silver-plated foam nickel, foam gold, and gold-plated foam nickel.

3. A method for preparing a silver peroxide cathode material for a high energy density metal fuel cell according to claim 1 or 2, characterized in that: In step S2, the solvent is one or more of anhydrous ethanol, acetone, and deionized water.

4. A method for preparing a silver peroxide cathode material for a high energy density metal fuel cell according to claim 1 or 2, characterized in that: The pressure of the vacuum environment is less than 130 Pa.

5. Silver peroxide cathode material for high energy density metal fuel cells, characterized in that: The silver peroxide cathode material for a high energy density metal fuel cell is prepared by the preparation method according to any one of claims 1 to 4.

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