serial number

title

application number

Request date

1

Preparation method of porous graphene and preparation method of graphene-based aluminum-air battery

CN8 13.4

20 13-07-23

2

Circulating filtration system and method for aluminum-air battery

CN549. 1

20 15-09- 12

three

Disposable aluminum-air battery

CN43 1.6

20 16-09- 12

four

Electrolyte circulation system of aluminum-air battery based on hydraulic cyclone

CN049.9

20 17-03- 14

five

Aluminum-air battery pack

CN 150.7

20 15-09- 14

1, patent analysis of preparation method of porous graphene and preparation method of graphene-based aluminum-air battery

Problems existing in the prior art: Aluminum-air battery has attracted wide attention because of its high specific energy, rich raw materials, safe use and good stability. As a new type of battery, aluminum-air battery with metal aluminum as anode has appeared in the market for more than 20 years. However, there are still many problems in aluminum-air electrode, such as hydrogen evolution by aluminum anode corrosion, serious polarization of air electrode, low oxygen expansion ability and low utilization rate of oxygen by air electrode. In recent years, in view of these shortcomings of air electrode in aluminum-air electrode, researchers at home and abroad have become increasingly mature in the research of aluminum anode, and cathode air electrode has become another research hotspot of aluminum-air battery. When the air electrode has electrical conductivity, catalytic activity, high air permeability and liquid impermeability, the specific energy of the battery can be greatly improved. At present, the main cathode catalysts for aluminum-air batteries are manganese dioxide, perovskite, metal-organic macrocyclic chelates and precious metals, but so far these catalysts have not been widely used. Graphene material is a kind of nano-material composed of single-layer graphite sheet, which has excellent electrical conductivity, mechanical properties and catalytic activity, and has become the research focus of many researchers in physics, chemistry and materials science. At present, it has been reported that graphene is applied to metal-air batteries such as lithium-air batteries and sodium-air batteries, but there is no report that graphene is applied to aluminum-air batteries. Therefore, it is of great significance to use graphene as cathode catalyst in aluminum-air batteries.

Technical features: the preparation method of porous graphene and the preparation method of graphene-based aluminum-air battery belong to the field of material synthesis and application. The porous graphene is prepared according to the following steps: taking graphite oxide as a precursor, carrying out high-temperature heat treatment on the graphite oxide in a muffle furnace, then dispersing the graphite oxide in ethanol, and carrying out ultrasonic treatment to prepare the graphene catalyst. The preparation method of graphene-based aluminum-air battery includes three steps: preparing air electrode diffusion layer, preparing graphene catalytic layer and assembling air electrode.

Beneficial effects: After graphene is applied to aluminum-air battery, its constant-current discharge voltage platform is higher than that of perovskite, manganese dioxide and other catalysts, and the stability of the battery is also obviously improved. On the other hand, graphene has simple preparation method and excellent performance, and can be produced in large quantities, reducing the manufacturing cost of the catalyst and improving the catalytic effect of the battery.

2. Patent analysis of circulating filtration system and method for aluminum-air battery.

Existing technical problems: At present, the global energy supply is increasingly scarce, and people are actively exploring new energy sources. Fuel cell has become one of the development hotspots in the field of new energy in the world because of its high efficiency, cleanliness and many other advantages. As a fuel cell, aluminum-air battery takes oxygen in the air as the positive active material and pure aluminum as the negative active material. Because of its high energy density, aluminum-air battery has become the first choice for high-energy and high-power standby power supply. Due to the different electrolytes used, the reaction mechanism of aluminum-air battery is also different. The main reactions of aluminum-air battery under alkaline conditions are as follows: anodic reaction: Al+4OH-=Al(OH)4-+3e- cathodic reaction: O2+2H2O+4e-=4OH- The total reaction of the battery is 4Al+3O2+6H2O+4OH-=4Al(OH)4- with the following corrosion reactions: 2A. Under neutral conditions, the reaction product is insoluble aluminum hydroxide colloid. At present, a special inhibitor is usually added to the electrolyte to make the colloid fall off from the anode in the form of crystalline powder to avoid its influence on the battery reaction. However, under alkaline conditions, soluble Al(OH)4- is the initial product of the reaction, and aluminum hydroxide is precipitated in the later stage, so the design of alkaline aluminum-air battery is complicated and there are many auxiliary facilities. At present, the application technology of aluminum-air battery has made great progress, but it has not been widely used. Mainly, some related technologies are not very mature, and there are still some problems to be solved urgently. There are few reports about aluminum-air battery in China, and there is no study on the circulating filtration of electrolyte in aluminum-air battery. It is mentioned in foreign research that the general medium and high power large aluminum-air battery pack needs electrolyte circulation system. Special inhibitor was added in the electrolyte circulation process, so that gibbsite, the reaction product of the battery, was precipitated and removed by filtration, but the separation device and its process were unknown, and there were no related studies and reports. There are few related studies and reports on aluminum-air batteries in China, which is far behind the research on aluminum-air batteries abroad. Therefore, it is necessary to design an electrolyte circulating filtration system to separate gibbsite from the electrolyte by special methods, so as to ensure the smooth reaction of the battery and prolong the working time of the battery.

Technical features: An aluminum-air battery circulating filtration system comprises a liquid storage tank, a pressurizing pump, an aluminum-air battery stack, a heat exchanger, a temperature sensor, a battery reaction product settling tank and a filter, and is characterized in that an ultrasonic device and a seed adding device are installed in the settling tank, and the liquid storage tank is provided with an electrolyte automatic replenishing device. 2. The circulating filtration system for aluminum-air batteries according to claim 1 is characterized in that the outlet of the liquid storage tank is connected with the inlet of the aluminum-air battery stack through a pressurizing pump, the outlet of the aluminum-air battery stack is connected with the inlet of the battery reaction product settling tank through a heat exchanger and a temperature sensor, and the outlet of the battery reaction product settling tank is connected with the inlet of the liquid storage tank through a filter and a pressure gauge. 3. A method for circularly filtering aluminum-air batteries by using the aluminum-air battery circulating filtering system according to claim 1 or 2, which is characterized by comprising the following steps: step 1: after the aluminum-air battery stack starts to work, the pressure pump works under the power supply of the aluminum-air battery stack, and electrolyte is introduced into the aluminum-air battery stack from the liquid storage tank; Step 2: the reaction electrolyte flowing out of the aluminum-air battery stack is heated in a heat exchanger, and after reaching 40-80 DEG C, it enters a battery reaction product settling tank, and after the electrolyte reaches the volume of the battery reaction product settling tank 1/2-2/3, the pressurizing pump stops working and stops liquid supply; Step 3: After the electrolyte enters the battery reaction product settling tank, the ultrasonic device starts to work, and Al(OH)3 seed crystal is added at the same time, so that gibbsite can quickly settle under the triple effects of temperature, ultrasonic wave and seed crystal; Step 4, the settled electrolyte enters a filter and is further filtered under the action of the filter, so that gibbsite is completely removed, and at the same time, the pressurizing pump can continue to work, so that the electrolyte to be treated continues to enter a battery reaction product settling tank for settling; Step 5: The filtered electrolyte will be collected into the liquid storage tank, and at the same time, due to the decrease of electrolyte concentration after the reaction, it is necessary to supplement high-concentration electrolyte to keep the concentration constant. 4. The circulating filtration method of aluminum-air battery according to claim 3, wherein in the second step, the temperature is 80.d egree. C.. 5. The circulating filtration method of aluminum-air battery according to claim 3, wherein the ultrasonic time is 60 minutes. 6. The circulating filtration method of aluminum-air battery according to claim 3, wherein the ultrasonic time is 40-60 minutes. 7. The circulating filtration method of aluminum-air battery according to claim 3, wherein the ultrasonic time is 60 minutes. 8. The circulating filtration method of aluminum-air battery according to claim 3, characterized in that the addition amount of the seed crystal is 5-30g/l.9. The circulating filtration method of aluminum-air battery according to claim 3, characterized in that the addition amount of the seed crystal is 20g/L.. 10. The circulating filtration method of aluminum-air battery according to claim 3, characterized in that ..

The technical effects are as follows: an ultrasonic device and a seeding device are installed in the settling tank, so that gibbsite generated in the reaction process of the aluminum-air battery stack has extremely strong filtering ability and filtering efficiency; The liquid storage tank can automatically replenish high-concentration electrolyte to ensure the constant electrolyte concentration when the battery works.

3. Brief analysis of disposable aluminum-air battery patent

Existing technical problems: At present, the global energy supply is increasingly scarce, and people are actively exploring new energy sources. Fuel cell has become one of the development hotspots in the field of new energy in the world because of its high efficiency, cleanliness and many other advantages. As a kind of fuel cell, aluminum-air battery has the advantages of high energy density, abundant aluminum anode materials, no pollution, high reliability and good safety, so it stands out among many fuel cells, and its application prospect is favored by all countries in the world. The United States, Canada, the former Yugoslavia, India, Britain and other countries are actively studying. Due to the successful development of air electrode with good performance, the research of aluminum-air battery has made great progress. Great progress has been made in the research of large, medium and small power aluminum-air batteries abroad.

Technical features: A disposable aluminum-air battery is characterized by at least comprising a single battery consisting of an aluminum electrode, an air electrode, a moisture absorber, an electrolyte and a battery case, wherein the moisture absorber consists of a moisture absorber and an ion exchange membrane, and the surfaces of the moisture absorber and the electrolyte are covered by the ion exchange membrane; One side of the hygroscopic agent is attached to the surface of the aluminum electrode, and the other side is in contact with the air electrode, and the distance between the aluminum electrode and the air electrode is controlled and fixed by the battery case.

Technical effects: The battery can absorb moisture from the air and generate electrolyte by itself without adding electrolyte, thus reducing the battery quality and making the battery have ultra-high energy density.

4. Patent analysis of electrolyte circulation system of aluminum-air battery based on hydraulic cyclone.

In the prior art, an aluminum-air fuel cell takes oxygen in the air as a positive electrode active substance, takes high-purity aluminum or aluminum alloy with high energy density as a negative electrode, and takes KOH and NaOH as electrolytes to convert a large amount of chemical energy contained in metallic aluminum into electric energy. Compared with other chemical power sources, aluminum-air battery has the following unique advantages: First, the specific energy is high, which can be as high as 87 18 Wh/kg in theory, and it can actually reach 300 ~ 400 Wh/kg at present, which is much higher than other batteries. Second, the discharge voltage of aluminum-air battery is very stable and the instantaneous output power is high.

One of the key problems affecting the use of aluminum-air battery is the treatment of electrolyte reaction products. At the same time, the aluminum electrode will undergo self-corrosion reaction in alkaline solution during discharge, and the products of flow reaction and corrosion reaction are aluminate. Aluminate will produce aluminum hydroxide and alumina particles under certain conditions, which are not easy to be directly filtered out in electrolyte. The high content of corrosion products of aluminum in electrolyte will lead to passivation of aluminum anode and poisoning of air electrode, which will lead to the voltage drop of aluminum-air battery. Moreover, the more Al(OH)3 accumulates in the electrolyte, the more viscous the electrolyte will become, which is not conducive to the diffusion of reaction products and reduces the specific capacity of aluminum-air batteries.

At present, there are few reports on the treatment and separation of reaction products in the electrolyte of aluminum-air battery in China, and the existing design also has some problems such as high energy consumption, high cost, large volume, and aluminum hydroxide and alumina particles can not be recycled.

Technical features: An aluminum-air battery electrolyte circulation system based on hydraulic cyclone action is characterized by consisting of an aluminum-air battery pack, an electrolyte storage barrel, a diaphragm pump and a precipitation collection device, wherein the upper part of the electrolyte storage barrel is provided with a liquid outlet, and the bottom part is provided with a drain valve, and the liquid outlet is connected with the inlet of the diaphragm pump through a pipeline; The precipitation collecting device consists of a cyclone and a precipitation collecting box, wherein the liquid inlet of the cyclone is connected with the outlet of a diaphragm pump through a liquid accelerating pipe, the liquid outlet at the top of the cyclone is connected with the liquid inlet of an aluminum-air battery pack through a pipeline, the liquid outlet of the aluminum-air battery pack is connected with an electrolyte storage barrel through a pipeline, and the liquid outlet at the bottom of the cyclone is connected with the precipitation collecting box through a cyclone underflow pipe; The upper part of the precipitation collection box is provided with a liquid outlet, and the bottom is provided with a sewage valve. The liquid outlet is connected with the pipeline between the electrolyte storage barrel and the diaphragm pump through a branch pipe, and the branch pipe is provided with a one-way valve and a pipeline valve.

Technical effect: that system has the advantages of simple design structure, low energy consumption and convenient maintenance, and greatly reduce the electrolyte consumption of the aluminum-air battery.

5. Patent analysis of aluminum-air battery stack

Existing technology: At present, the global energy supply is increasingly scarce, and people are actively exploring new energy sources. Fuel cell has become one of the development hotspots in the field of new energy in the world because of its high efficiency, cleanliness and many other advantages. As a kind of fuel cell, aluminum-air battery has the advantages of high energy density, abundant aluminum anode materials, no pollution, high reliability and good safety, so it stands out among many fuel cells, and its application prospect is favored by all countries in the world. The United States, Canada, the former Yugoslavia, India, Britain and other countries are actively studying. Due to the successful development of air electrode with good performance, the research of aluminum-air battery has made great progress. Great progress has been made in the research of large, medium and small power aluminum-air batteries abroad.

Technical features: An aluminum-air battery stack is characterized in that the stack consists of a front panel, a thick grille, a grille, an air electrode, a reinforcing grille, a battery exoskeleton, a thick battery exoskeleton, an aluminum electrode, an aluminum electrode holder, a back cover and an air flow channel, wherein the battery exoskeleton and the thick battery exoskeleton are arranged between the front panel and the back cover, and the number of the battery exoskeleton is at least one, and the number of the thick battery exoskeleton is one. A thick grid, an air electrode and a reinforcing grid are sequentially arranged between the front panel and the battery frame and between the back cover and the thick battery frame; A reinforcing grid, an air electrode, a grid, a grid, an air electrode and a reinforcing grid are sequentially arranged between the battery exoskeleton and the thick battery exoskeleton; The aluminum electrode is inserted into the aluminum electrode holder, and the aluminum electrode holder is inserted into the top of the battery exoskeleton and the thick battery exoskeleton; The convex table of the thick grille faces the front panel and the back cover, and an airflow channel is formed between the convex table and the front panel and the back cover; The bosses of two grids between the battery exoskeleton and the thick battery exoskeleton are oppositely arranged to form an air flow channel; The reinforcing grid bosses on both sides of the battery outer frame and the thick battery outer frame are relatively placed on both sides of the aluminum electrode to form an air channel and a cavity where electrolyte flows; The battery exoskeleton and the thick battery exoskeleton comprise a liquid inlet, a liquid inlet channel, a battery reaction cavity, a liquid outlet channel and a liquid outlet; The inlet of the front panel is communicated with the inlet of the battery exoskeleton and the thick battery exoskeleton, and the outlet of the front panel is communicated with the outlet of the battery exoskeleton and the thick battery exoskeleton.

The technical effect is that a plurality of single batteries can be connected in series, thus greatly simplifying the battery structure and improving the voltage and power of the battery.