Integrated metal hydrogen-oxygen fuel cell system constructed based on aluminum-lithium alloy

Abstract

The invention discloses an integrated metal hydrogen-oxygen fuel cell system constructed based on an aluminum-lithium alloy, and by optimizing the element composition and the surface appearance of a metal air cell negative electrode, the working voltage of the cell is kept stable, and meanwhile, the generation efficiency and the stability of hydrogen are remarkably improved. The 2195 aluminum-lithium alloy negative electrode is selected, the electrochemical activity is enhanced, more reaction sites are exposed through the optimized morphology, it is ensured that hydrogen is continuously generated in the side reaction, and sufficient and stable fuel is provided for the hydrogen-oxygen fuel cell. According to the system, the metal-air cell and the hydrogen-oxygen fuel cell are coupled, so that efficient cyclic utilization of hydrogen is realized, the problem of hydrogen waste in a traditional cell is avoided, and the energy efficiency and the cell performance of the whole system are further improved.

Description

Technical Field

[0001] The present invention belongs to the field of high energy power sources, and in particular, relates to an integrated metal hydrogen and oxygen fuel cell system constructed based on aluminum-lithium alloy. Background Art

[0002] With the development of science and technology, it is of great significance to develop and design high-energy portable power sources and emergency applications in the field of environment and energy. Metal-air batteries are batteries that use metal as negative electrode fuel and oxygen as positive electrode fuel to convert the chemical energy of fuel into electrical energy. It consists of a metal negative electrode, a salt or alkaline aqueous solution electrolyte, and an oxygen positive electrode. Common materials for metal negative electrodes are Mg, Al, Zn, Fe, Li and their alloys, and the positive electrode catalytic material is generally Pt; MnO2 and other active substances. The battery electrolyte is generally a strong alkaline aqueous solution such as KOH, NaOH, etc. Hydrogen-oxygen fuel cells use hydrogen and oxygen in the air as fuel to convert chemical energy into electrical energy. It consists of a hydrogen anode, a diaphragm, and an oxygen cathode. Hydrogen and oxygen generate water through the electrolyte under the action of the catalyst on the electrode. The commonly used hydrogen-oxygen fuel cell is a proton exchange membrane fuel cell. This type of battery is actually just an energy conversion device. This type of battery has the advantages of high conversion efficiency, large capacity, high specific energy, wide power range, and no need to be charged. Metal-air batteries have the characteristics of high theoretical energy density, long shelf life, abundant raw materials, and high safety, and can be widely used in portable power supplies, emergency power supplies, etc. However, the application of alkaline aluminum-air batteries faces the problem of negative electrode hydrogen evolution side reaction, which reduces the utilization rate of metals and the output voltage of monomers, restricting the practical application of metal-air batteries.

[0003] There are currently three methods used to address the problem of hydrogen evolution side reaction caused by corrosion of the negative electrode of metal-air batteries.

[0004] (1) Adding other elements such as Sn, In, Zn, etc. to the metal negative electrode to form an alloy to increase the hydrogen evolution overpotential and inhibit the side reaction of hydrogen evolution. At present, the highest efficiency of inhibiting hydrogen evolution by this alloying method is 76%, which cannot effectively solve the problem of hydrogen evolution.

[0005] (2) Adding corrosion inhibitors such as NaCl, ZnO, CaO, etc. to the electrolyte. The method of adding corrosion inhibitors to the electrolyte will reduce the conductivity of the electrolyte and significantly reduce the current density of the battery.

[0006] (3) Pure magnesium alloy or pure aluminum alloy is used as the negative electrode of the metal-air battery to increase the amount of hydrogen evolution, and is connected to the hydrogen-oxygen fuel cell through a gas pipeline to absorb the hydrogen produced by the side reaction of the metal-air battery negative electrode, forming a "dual fuel cell". In this method, the amount of hydrogen evolution from the pure magnesium or pure aluminum negative electrode is too large, and the composite hydrogen-oxygen fuel cell has limited hydrogen absorption capacity. Therefore, excessive hydrogen produced by the side reaction of the air battery will reduce the utilization rate of hydrogen and waste resources. The metal-air battery and the hydrogen-oxygen fuel cell are connected by a simple gas path. In fact, it is a composite of two independent batteries. It will also reduce the energy utilization rate of the battery. This will restrict the development of high-energy battery power sources.

[0007] In view of this, the present invention is proposed. Summary of the invention

[0008] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide an integrated metal hydrogen and oxygen fuel cell system constructed based on aluminum-lithium alloy, thereby solving the problems raised in the above-mentioned background technology.

[0009] In order to solve the above technical problems, the basic concept of the technical solution adopted by the present invention is:

[0010] An integrated metal hydrogen and oxygen fuel cell system constructed based on aluminum-lithium alloy, a combined power system formed by coupling a metal-air battery and a hydrogen and oxygen fuel cell, characterized in that the metal-air battery includes a metal-air battery positive electrode, an electrolyte cavity, a negative electrode tab, an air battery outlet, and an aluminum-lithium alloy negative electrode; the metal-air battery positive electrode is connected to the electrolyte cavity, and is responsible for reacting with oxygen in the air to generate current and support the continuous battery reaction; the electrolyte cavity is connected to the metal negative electrode tab, and the electrolyte in the electrolyte reacts with the aluminum-lithium alloy negative electrode and outputs current through the negative electrode tab; the air battery outlet is arranged at the top of the metal-air battery, and is used to discharge hydrogen generated by the side reaction of the aluminum-lithium alloy negative electrode, and transport it to the hydrogen and oxygen fuel cell through an air pipe.

[0011] Optionally, the aluminum-lithium alloy negative electrode is an alloy composed of Al, Mg, Cu, and Li metal elements.

[0012] Optionally, the positive electrode of the metal-air battery is formed by stacking and pressing a waterproof breathable membrane, a nickel mesh, a waterproof breathable membrane, and a catalytic membrane in sequence, wherein the waterproof breathable membrane is formed by pressing a mixture of PTFE and acetylene black or carbon black material; wherein the content of PTFE is 30-50wt%, and the thickness of the waterproof breathable membrane is 0.30mm.

[0013] Optionally, when preparing the positive electrode of the metal-air battery, the waterproof breathable membrane-nickel mesh-waterproof breathable membrane-catalytic membrane are stacked and rolled in the order to obtain a membrane electrode with a thickness of 0.56 mm, and then sintered at 300 degrees in a muffle furnace for 1 hour to obtain a complete air positive electrode.

[0014] Optionally, the catalytic membrane is formed by mixing and pressing PTFE, conductive carbon, activated carbon and manganese dioxide materials in proportion, wherein the content of PTFE is 10-15wt%, the content of conductive carbon, activated carbon and manganese dioxide is 20-30wt%, and the thickness of the nickel mesh is 0.3mm.

[0015] Optionally, the hydrogen and oxygen fuel cell includes an anode plate and a cathode plate, a hydrogen and oxygen fuel cell membrane electrode is arranged inside the hydrogen and oxygen fuel cell, a hydrogen and oxygen fuel cell pole ear is arranged above the anode plate, and an anode part of the anode plate is provided with an anode hydrogen inlet connected to the metal air battery outlet, which is used to introduce the hydrogen generated by the metal air battery into the hydrogen and oxygen fuel cell anode for reaction.

[0016] Optionally, the opposite sides of the anode plate and the cathode plate are coated with an anode catalyst and a cathode catalyst, respectively, and the catalyst loading of the anode catalyst layer and the cathode catalyst layer is 0.5 mg / cm 2 and cathode 0.25mg / cm 2 Pt / C.

[0017] Optionally, a proton exchange membrane is provided inside the battery membrane electrode, and a titanium mesh is provided on the other side of the anode plate of the anode catalyst layer.

[0018] Optionally, the circuits of the metal-air battery and the hydrogen-oxygen fuel cell are connected in series, in parallel, or in a series-parallel hybrid manner.

[0019] After adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art. Of course, any product implementing the present invention does not necessarily need to achieve all the advantages described below at the same time:

[0020] 1. By optimizing the elemental composition and surface morphology of the metal-air battery negative electrode, the efficiency and stability of hydrogen generation are significantly improved while maintaining the stability of the battery operating voltage. The 2195 aluminum-lithium alloy negative electrode is selected to enhance the electrochemical activity, and the optimized morphology exposes more reaction sites to ensure that the side reaction continues to produce hydrogen, providing sufficient and stable fuel for the hydrogen-oxygen fuel cell. By coupling the metal-air battery with the hydrogen-oxygen fuel cell, the system achieves efficient recycling of hydrogen, avoids the problem of hydrogen waste in traditional batteries, and further improves the energy efficiency and battery performance of the overall system.

[0021] 2. The integrated metal hydrogen and oxygen fuel cell system of the present invention can effectively absorb the hydrogen produced by the negative electrode side reaction of the metal-air battery. By efficiently transmitting hydrogen to the hydrogen and oxygen fuel cell for secondary power generation, the utilization efficiency of hydrogen is greatly improved, thereby improving the overall energy output of the system. This design avoids the potential safety hazards caused by the accumulation of hydrogen in the metal-air battery, and effectively reduces the risk of explosion caused by hydrogen accumulation. At the same time, the timely absorption of hydrogen makes the system operation more stable, reduces the battery temperature, and extends the service life of the equipment. This integrated structural design is simple and compact, and each module is easy to combine, convenient to carry and maintain, and can flexibly adapt to the needs of different scenarios. The system is not only suitable for portable power supplies, but also can provide stable backup power supplies in emergency situations to meet various power requirements. It has broad application prospects and market potential.

[0022] The specific implementation modes of the present invention are further described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The drawings described below are only some embodiments. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0024] In the figure:

[0025] Figure 1 Element analysis and SEM image of the aluminum-lithium alloy negative electrode in the metal-air battery of the present invention;

[0026] Figure 2 This is a schematic diagram of the structure of the integrated metal hydrogen and oxygen fuel cell system of the present invention;

[0027] Figure 3 is the discharge curve of the hydrogen-oxygen fuel cell at low current density in Example 1;

[0028] Figure 4 This is the discharge curve of the hydrogen-oxygen fuel cell in Example 2 at high current density.

[0029] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0030] 1. Metal-air battery; 2. Hydrogen-oxygen fuel cell; 3. Metal-air battery positive electrode; 4. Electrolyte chamber; 5. Negative electrode ear; 6. Air battery outlet; 7. Aluminum-lithium alloy negative electrode; 8. Anode plate; 9. Cathode plate; 10. Anode hydrogen inlet; 11. Battery membrane electrode; 12. Hydrogen-oxygen fuel cell ear.

[0031] It should be noted that these drawings and textual descriptions are not intended to limit the conceptual scope of the present invention in any way, but are intended to illustrate the concept of the present invention for those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0032] The present invention will now be described in further detail with reference to the accompanying drawings.

[0033] See also Figure 1-4 As shown, in this embodiment, an integrated metal hydrogen and oxygen fuel cell system based on aluminum-lithium alloy is provided, which is a combined power system formed by coupling a metal-air battery 1 and a hydrogen and oxygen fuel cell 2, characterized in that the metal-air battery 1 includes a metal-air battery positive electrode 3, an electrolyte cavity 4, a negative electrode tab 5, an air battery outlet 6, and an aluminum-lithium alloy negative electrode 7; the metal-air battery positive electrode 3 is connected to the electrolyte cavity 4, and is responsible for reacting with oxygen in the air to generate current and support the continuous battery reaction; the electrolyte cavity 4 is connected to the metal negative electrode tab 5, and the electrolyte in the electrolyte cavity reacts with the aluminum-lithium alloy negative electrode 7, and outputs current through the negative electrode tab 5; the air battery outlet 6 is arranged at the top of the metal-air battery 1, and is used to discharge the hydrogen generated by the side reaction of the aluminum-lithium alloy negative electrode 7, and transport it to the hydrogen and oxygen fuel cell 2 through the air pipe.

[0034] The present invention regulates the metal negative electrode elements and morphology in the air battery. The increase of lithium elements in the aluminum-lithium alloy increases the electrochemical activity of the metal-air battery 1, and the uniform corrosion in the aluminum-lithium alloy can well expose its corrosion sites and provide a stable hydrogen source. The integrated metal hydrogen and oxygen fuel cell system structure significantly improves the energy utilization rate of the battery.

[0035] In this embodiment, the aluminum-lithium alloy negative electrode 7 is an alloy composed of Al, Mg, Cu, and Li metal elements.

[0036] In this embodiment, the metal-air battery positive electrode 3 is formed by stacking and pressing a waterproof breathable membrane, a nickel mesh, a waterproof breathable membrane, and a catalytic membrane in sequence, wherein the waterproof breathable membrane is formed by mixing and pressing PTFE and acetylene black or carbon black materials; wherein the content of PTFE is 30-50wt%, and the thickness of the waterproof breathable membrane is 0.30mm.

[0037] In this embodiment, when preparing the metal-air battery positive electrode 3, the waterproof breathable membrane-nickel mesh-waterproof breathable membrane-catalytic membrane are stacked and rolled in the order to obtain a membrane electrode with a thickness of 0.56 mm, and then sintered at 300 degrees in a muffle furnace for 1 hour to obtain a complete air positive electrode.

[0038] In this embodiment, the catalytic membrane is formed by mixing and pressing PTFE, conductive carbon, activated carbon, and manganese dioxide materials in proportion, wherein the content of PTFE is 10-15wt%, the content of conductive carbon, activated carbon, and manganese dioxide is 20-30wt%, and the thickness of the nickel mesh is 0.3mm.

[0039] In this embodiment, the hydrogen-oxygen fuel cell 2 includes an anode plate 8 and a cathode plate 9. A hydrogen-oxygen fuel cell 2 membrane electrode is arranged inside the hydrogen-oxygen fuel cell 2. A hydrogen-oxygen fuel cell pole ear 12 is arranged above the anode plate 8. The anode part of the anode plate 8 is provided with an anode hydrogen inlet 10 connected to the gas outlet of the metal-air battery 1, which is used to introduce the hydrogen generated by the metal-air battery 1 into the anode of the hydrogen-oxygen fuel cell 2 for reaction.

[0040] In this embodiment, the opposite sides of the anode plate 8 and the cathode plate 9 are coated with an anode catalyst and a cathode catalyst, respectively. The catalyst loading of the anode catalyst layer and the cathode catalyst layer is 0.5 mg / cm 2 and cathode 0.25mg / cm 2 Pt / C.

[0041] In this embodiment, a proton exchange membrane is arranged inside the battery membrane electrode 11, and a titanium mesh is arranged on the other side of the anode catalyst layer anode plate 8. The titanium mesh electrode area is 16 cm 2 .

[0042] In this embodiment, the metal-air battery 1 and the hydrogen-oxygen fuel cell 2 are connected in series, in parallel, or in a series-parallel hybrid manner.

[0043] Example 1

[0044] The negative electrode material is 2195 aluminum-lithium alloy, which has uniform surface defect morphology, improving the electrochemical activity and energy utilization of the system. During the reaction process of the metal-air battery 1, the aluminum-lithium alloy negative electrode 7 contacts the electrolyte, undergoes an oxidation reaction, and generates electrons and hydrogen. The generated hydrogen serves as the fuel source of the hydrogen-oxygen fuel cell 2. The negative electrode area is 30 cm 2 , ensuring sufficient reaction surface area to maintain stable current output.

[0045] The positive electrode is composed of a waterproof and breathable layer, a current collector nickel mesh and a catalytic layer. The catalytic layer contains a manganese dioxide catalyst, a PTFE binder, conductive carbon, and activated carbon. After mixing, these materials are roughly pressed and finely pressed on a roller press to form a 0.35mm thick catalytic membrane, in which the content of PTFE is 10wt%, and the content of conductive carbon, activated carbon, and manganese dioxide is 33.3wt%.

[0046] The waterproof and breathable layer is made of a mixture of 30% PTFE and 70% carbon black, with a thickness of 0.30mm, ensuring that air can smoothly enter the positive electrode and prevent electrolyte leakage. The current collector uses a 0.3mm thick nickel mesh to support the positive electrode structure and ensure efficient conduction of electrons.

[0047] The waterproof breathable membrane-nickel mesh-waterproof breathable membrane-catalytic membrane are stacked in order and pressed by a roller press to obtain a membrane electrode with a total thickness of 0.56 mm. After assembly, the membrane electrode is sintered in a muffle furnace at 300°C for 1 hour to ensure the stability of the electrode structure and improve the conductivity and catalytic efficiency. The prepared membrane electrode is used for the positive electrode part of the metal-air battery 1. The electrolyte chamber 4 is filled with 100ml4MKOH solution to support the negative electrode oxidation reaction and participate in the side reaction to generate hydrogen, while ensuring the efficient operation of the battery.

[0048] The hydrogen generated by the aluminum-lithium alloy negative electrode 7 is discharged through the air battery outlet 6 and transported to the anode hydrogen inlet 10 of the hydrogen-oxygen fuel cell 2 through the gas path. The hydrogen-oxygen fuel cell 2 adopts a proton exchange membrane fuel cell PEMFC structure and uses Nafion212 as the electrolyte membrane. Both the anode and cathode use 60% Pt / C catalyst, and the loading amount is 0.5 mg / cm 2 and 0.25mg / cm 2 Hydrogen is decomposed into electrons and protons at the anode. Protons migrate to the cathode through the proton exchange membrane and combine with oxygen to form water. Electrons are transmitted through the external circuit to form current and are output by the hydrogen-oxygen fuel cell pole 12. The titanium mesh current collector of the anode is used to collect electrons and transmit them to the circuit to ensure stable operation of the system.

[0049] The hydrogen channel of the anode chamber of the hydrogen-oxygen fuel cell 2 is connected to the gas outlet at the top of the aluminum-lithium air battery, such as Figure 2 As shown, the anode of the hydrogen-oxygen fuel cell 2 is vertically located directly above the aluminum-lithium air battery. The dual hydrogen gas inlets of the hydrogen-oxygen fuel cell 2 are connected to the aluminum-lithium air battery to ensure that the hydrogen generated by the aluminum-lithium air battery can be passed into the hydrogen-oxygen fuel cell 2. The dual inlets ensure uniform coverage of the hydrogen gas on the anode of the hydrogen-oxygen fuel cell 2, improve the discharge stability of the hydrogen-oxygen fuel cell 2, and the unreacted hydrogen gas is recycled back to the hydrogen-oxygen fuel cell 2, which improves the utilization rate of hydrogen in the fuel cell system and avoids waste of resources. In the integrated aluminum-lithium air battery / hydrogen-oxygen fuel cell system structure, the pole ears of the two module batteries are on the same side, which is easy to connect the battery circuit.

[0050] The aluminum-lithium air battery module of Example 1 and the hydrogen-oxygen fuel cell 2 were respectively subjected to constant current discharge tests. 2 The hydrogen-oxygen fuel cell 2 operates under constant current discharge conditions of 0-15mA / cm 2 The test was carried out within the constant current discharge range, showing good electrochemical reaction performance. The specific discharge curve is as follows Figure 3 shown.

[0051] Depend on Figure 3It can be seen that under the above test conditions, the average discharge voltage of the aluminum-lithium air battery is 1.53V, which is comparable to the performance of other commercial aluminum alloy air batteries on the market, but the advantage of this system lies in its higher efficiency and more stable performance. 2 The average discharge voltage in the range is 0.7V. Even under different current density conditions, the discharge curve remains stable, indicating that the catalyst layer and proton exchange membrane structure of the battery ensure long-term stable power output. Tests show that the system's hydrogen consumption rate is as high as 74%. This means that the hydrogen generated by the negative electrode side reaction of the aluminum-lithium air battery is efficiently utilized by the hydrogen-oxygen fuel cell 2, reducing the waste of hydrogen. Traditional metal-air batteries 1 often cause energy loss due to hydrogen evolution side reactions, and this system achieves effective consumption and recycling of hydrogen by recovering hydrogen and using it for hydrogen-oxygen fuel cells 2 to generate electricity.

[0052] Specifically, the coupling structure of the integrated aluminum-lithium air battery and hydrogen-oxygen fuel cell system not only improves the overall energy utilization of the system, but also improves the utilization efficiency of the metal negative electrode. The design of this dual-battery module enables the side reaction products of the aluminum-lithium air battery to be fully utilized, avoiding the waste of resources in traditional batteries. At the same time, the stability of the system and the smoothness of the output voltage also show that it is suitable for long-term operation scenarios.

[0053] Further, by Figure 3 It can be seen from the figure that under the constant current discharge current of the aluminum-lithium air battery of 5 mA / cm2, the average discharge voltage of the single cell is 1.5V. The constant current discharge current of the hydrogen-oxygen fuel cell 2 is 0-15 mA / cm2; it can be seen from the figure that under the above test conditions, the oxygen fuel cell is 0-15 mA / cm 2 Under constant current discharge, the average discharge voltage is 0.7V, with excellent discharge performance and high stability.

[0054] Hydrogen consumption reaches 74%

[0055] Example 2

[0056] The aluminum-lithium negative electrode area in Example 2 is 110 cm 2 The area of ​​the aluminum-lithium negative electrode in Example 2 is greatly increased from 30 cm 2 Expand to 110cm 2 This means that more surface area will increase the electrode's reaction efficiency and the battery's overall power output.

[0057] In Example 2, the PTFE content of the catalytic layer is increased to 15wt%, and the contents of conductive carbon, activated carbon and manganese dioxide are 28.3wt%. The amount of electrolyte in Example 2 is increased to 300ml to match the larger electrode area to ensure the efficiency and stability of the electrolytic reaction.

[0058] Example 2 During the test, the aluminum-lithium air battery module and the hydrogen-oxygen fuel cell 2 were respectively subjected to constant current discharge tests to verify their performance under high current density conditions. 2 The hydrogen-oxygen fuel cell 2 operates at a higher current discharge of 15-25mA / cm 2 The constant current discharge test was carried out within the range of Figure 4 The test results show the excellent performance of the system at different current densities and prove its stability under high load operation. Under the above test conditions, the average discharge voltage of the aluminum-lithium air battery is 1.53V, which is consistent with the performance of other commercial aluminum alloy air batteries on the market. However, the system shows stronger stability and performance optimization capabilities at high current density. Hydrogen-oxygen fuel cell 2 at 15-25mA / cm 2 In the constant current discharge range, the average discharge voltage is maintained at 0.6 V. Even under higher current density conditions, the voltage decay of the system is still very small, indicating that the catalyst layer and proton exchange membrane have excellent stability and durability.

[0059] The system's hydrogen consumption rate is as high as 86%, which is much higher than the performance of traditional fuel cell systems. This means that most of the hydrogen generated by the negative electrode of the aluminum-lithium air battery is efficiently recovered and used in the power generation process of the hydrogen-oxygen fuel cell 2. This design solves the problem of resource waste caused by the hydrogen evolution side reaction of the traditional metal-air battery 1, and realizes the effective utilization and recycling of hydrogen. The hydrogen-oxygen fuel cell 2 still maintains efficient power generation under different load conditions, further improving the energy utilization rate of the system.

[0060] Specifically, as the electrode area of ​​the metal-air battery 1 increases, the system can generate more hydrogen, thereby meeting the operating requirements of the hydrogen-oxygen fuel cell 2 under high current density conditions. This modular combined power system achieves higher power output by integrating aluminum-lithium air batteries and hydrogen-oxygen fuel cells 2, and is suitable for high-power application scenarios that require long-term stable power supply. This design can meet the application requirements of high-demand scenarios such as emergency power supplies and backup power systems, and reduce resource waste while improving energy efficiency.

[0061] More specifically, Figure 4 The constant current discharge current of the Chalco lithium-air battery is 5 mA / cm2, and the constant current discharge current of the hydrogen-oxygen fuel cell 2 is 15-25 mA / cm2.

[0062] The present invention is not limited to the above-mentioned embodiments. Anyone should be aware that any structural changes made under the enlightenment of the present invention, and any technical solutions that are the same or similar to the present invention, fall within the protection scope of the present invention. The technology, shape, and structural parts not described in detail in the present invention are all well-known technologies.

Claims

1. An integrated metal hydrogen-oxygen fuel cell system based on aluminum-lithium alloy, a combined power system formed by coupling a metal-air battery (1) and a hydrogen-oxygen fuel cell (2), characterized in that: The metal-air battery (1) comprises a metal-air battery positive electrode (3), an electrolyte chamber (4), a negative electrode tab (5), an air battery gas outlet (6), and an aluminum-lithium alloy negative electrode (7); the metal-air battery positive electrode (3) is connected to the electrolyte chamber (4), and is responsible for reacting with oxygen in the air to generate current and support the continuous progress of the battery reaction; the electrolyte chamber (4) is connected to the metal negative electrode tab (5), and the electrolyte in the electrolyte reacts with the aluminum-lithium alloy negative electrode (7), and outputs current through the negative electrode tab (5); the air battery gas outlet (6) is arranged at the top of the metal-air battery (1), and is used to discharge hydrogen generated by the side reaction of the aluminum-lithium alloy negative electrode (7), and transport it to the hydrogen-oxygen fuel cell (2) through the gas pipe.

2. The integrated metal hydrogen and oxygen fuel cell system based on aluminum-lithium alloy according to claim 1 is characterized in that: The aluminum-lithium alloy negative electrode (7) is an alloy composed of Al, Mg, Cu and Li metal elements.

3. The integrated metal hydrogen and oxygen fuel cell system based on aluminum-lithium alloy according to claim 2 is characterized in that: The metal-air battery positive electrode (3) is formed by sequentially stacking and pressing a waterproof breathable membrane, a nickel mesh, a waterproof breathable membrane, and a catalytic membrane, wherein the waterproof breathable membrane is formed by mixing and pressing PTFE and acetylene black or carbon black materials; wherein the content of PTFE is 30-50wt%, and the thickness of the waterproof breathable membrane is 0.30mm.

4. The integrated metal hydrogen and oxygen fuel cell system based on aluminum-lithium alloy according to claim 3 is characterized in that: When preparing the metal-air battery positive electrode (3), the waterproof breathable membrane-nickel mesh-waterproof breathable membrane-catalytic membrane are stacked and rolled in the order to obtain a membrane electrode with a thickness of 0.56 mm. After sintering at 300 degrees in a muffle furnace for 1 hour, a complete air positive electrode is obtained.

5. The integrated metal hydrogen and oxygen fuel cell system based on aluminum-lithium alloy according to claim 4 is characterized in that: The catalytic membrane is formed by mixing and pressing PTFE, conductive carbon, activated carbon and manganese dioxide materials in proportion, wherein the content of PTFE is 10-15wt%, the content of conductive carbon, activated carbon and manganese dioxide is 20-30wt%, and the thickness of the nickel mesh is 0.3mm.

6. The integrated metal hydrogen and oxygen fuel cell system based on aluminum-lithium alloy according to claim 5 is characterized in that: The hydrogen-oxygen fuel cell (2) comprises an anode electrode plate (8) and a cathode electrode plate (9); a hydrogen-oxygen fuel cell (2) membrane electrode is arranged inside the hydrogen-oxygen fuel cell (2); a hydrogen-oxygen fuel cell pole ear (12) is arranged above the anode electrode plate (8); and an anode hydrogen inlet (10) connected to a gas outlet of the metal-air battery (1) is arranged on the anode portion of the anode electrode plate (8) for introducing hydrogen generated by the metal-air battery (1) into the anode of the hydrogen-oxygen fuel cell (2) for reaction.

7. The integrated metal hydrogen and oxygen fuel cell system based on aluminum-lithium alloy according to claim 6 is characterized in that: The opposite sides of the anode plate (8) and the cathode plate (9) are coated with an anode catalyst and a cathode catalyst, respectively. The catalyst loadings of the anode catalyst layer and the cathode catalyst layer are 0.5 mg / cm 2 and cathode 0.25mg / cm 2 Pt / C.

8. The integrated metal hydrogen and oxygen fuel cell system based on aluminum-lithium alloy according to claim 7 is characterized in that: A proton exchange membrane is arranged inside the battery membrane electrode (11), and a titanium mesh is arranged on the other side of the anode plate (8) of the anode catalyst layer.

9. The integrated metal hydrogen and oxygen fuel cell system based on aluminum-lithium alloy according to claim 8, characterized in that: The circuits of the metal-air battery (1) and the hydrogen-oxygen fuel cell (2) are connected in series, in parallel or in a series-parallel mixed manner.

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