Button type double-electrolyte lithium air battery mold

Abstract

The utility model relates to a button type double-electrolyte lithium air battery mold. Vent holes which are regularly arranged are formed in the center of the perforated positive electrode current collector, the electrolyte connecting chamber is a circular ring with the upper portion and the lower portion provided with circular grooves with the diameters of 16 mm and 14 mm and the depths of 0.1 mm and 1 mm respectively, the rubber sealing ring is fixed to the outer side of the negative electrode current collector in an interference fit mode, and the perforated positive electrode current collector is buckled outside the rubber sealing ring. The solid electrolyte membrane is fixed by a lower circular groove of the electrolyte connecting chamber, the non-woven fabric diaphragm is fixed by an upper circular groove of the electrolyte connecting chamber, the stainless steel gasket is supported by the diaphragm spring, the circular lithium foil is placed in the center of the stainless steel gasket, and the air positive electrode is placed in the center of the non-woven fabric diaphragm. And assembling by using a button cell sealing machine. According to the utility model, the problems of huge volume, inconvenience in carrying and difficulty in assembly of the traditional double-electrolyte lithium air battery are directly solved, and a possibility is provided for commercialization of a double-electrolyte lithium air battery mold in the future.

Description

Technical Field

[0001] The utility model belongs to the field of chemical power sources, and in particular relates to a button-type dual-electrolyte lithium-air battery mould with a simple structure. Background Art

[0002] Since the industrial age, the extensive use of fossil fuels has led to rising greenhouse gas concentrations and worsening air quality, prompting increasing interest in energy storage and conversion technologies. After years of development, the energy density of lithium-ion batteries has approached its theoretical upper limit, prompting researchers to explore other types of secondary batteries. Rechargeable metal-air batteries, with their extremely high theoretical energy density, have become a research hotspot. Lithium-air batteries, with the highest theoretical energy density of any metal-air battery, reaching 11,140 Wh / kg, have garnered considerable attention. However, current mainstream organic lithium-oxygen batteries face challenges: the lithium peroxide (Li2O2) generated at their cathode is both insoluble and insulating, limiting their operation to oxygen environments. In air, the byproducts that cannot be effectively decomposed rapidly accumulate and fail, leading to rapid degradation. Some batteries even require high temperatures to maintain activity and are extremely sensitive to moisture, hindering their practical application. In contrast, the dual-electrolyte lithium-air battery we studied produces water-soluble lithium hydroxide (LiOH) at its cathode, avoiding the problem of cathode clogging. Importantly, this battery can operate directly in air, a key step towards practical application. Because the positive electrode uses an aqueous electrolyte, its sensitivity to humidity is far lower than that of organic lithium-oxygen batteries, and aqueous electrolytes are safe and environmentally friendly. Therefore, dual-electrolyte lithium-air batteries are considered one of the most promising energy storage systems.

[0003] The dual-electrolyte lithium-air battery molds currently on the market are large and bulky, not easy to carry, can only be laid flat for testing, and the aqueous electrolyte is prone to leakage. Utility Model Content

[0004] This utility model provides a button-type dual-electrolyte lithium-air battery mold. This mold is compact and convenient, can be tested using a traditional button test environment, and its regular structure makes it easy to assemble. The button-type design is an important step in the development of dual-electrolyte lithium-air batteries.

[0005] The technical solution of the utility model is as follows:

[0006] A button-type dual-electrolyte lithium-air battery mold, comprising a negative electrode shell, a diaphragm spring, a stainless steel gasket, a glass fiber membrane, a solid electrolyte membrane, an electrolyte connection chamber, a non-woven fabric diaphragm, a rubber sealing ring and an open-pore positive electrode current collector;

[0007] The center of the open-pored positive electrode current collector is provided with regularly arranged vent holes;

[0008] The electrolyte connecting chamber is provided with a circular ring with upper and lower circular grooves, wherein the diameter of the lower circular groove is 14 mm and the groove depth is 1 mm, and the diameter of the upper circular groove is 16 mm and the groove depth is 0.1 mm;

[0009] The rubber sealing ring is fixed outside the negative electrode shell, and the open positive electrode current collector is buckled outside the rubber sealing ring.

[0010] The solid electrolyte membrane is fixed in the lower circular groove of the electrolyte connecting chamber.

[0011] The non-woven fabric diaphragm is fixed in the upper circular groove of the electrolyte connecting chamber.

[0012] The diaphragm spring is arranged at the lower end of the stainless steel gasket for supporting the stainless steel gasket.

[0013] The circular lithium foil is placed at the upper end of the stainless steel gasket.

[0014] The air positive electrode is placed at the upper end of the non-woven fabric diaphragm.

[0015] The negative electrode shell, diaphragm spring, stainless steel gasket, and open positive electrode current collector are all made of stainless steel.

[0016] The rubber sealing ring is made of rubber.

[0017] The solid electrolyte membrane is a ceramic sheet.

[0018] The electrolyte connecting chamber is made of insulating material.

[0019] The negative electrode shell is tightly covered by the rubber sealing ring.

[0020] The open positive electrode current collector is tightly buckled outside the rubber sealing ring by the packaging pressure of the button cell sealing machine to ensure sealing, and the packaging pressure is 800 Pa and is maintained for 5 s.

[0021] The electrolyte connecting chamber is processed by CNC to reduce surface roughness.

[0022] The base of the air positive electrode is carbon paper, carbon cloth, or foamed nickel.

[0023] The solid electrolyte membrane is Nasicon type inorganic solid-state electrolyte, Lisicon type inorganic solid-state electrolyte, or garnet type solid-state electrolyte.

[0024] Preferably, the solid electrolyte membrane is fixed in the lower circular groove of the electrolyte connecting chamber by epoxy resin.

[0025] Preferably, the electrolyte connecting chamber is filled with aqueous electrolyte by using a pipette gun when the battery is assembled.

[0026] Preferably, the non-woven membrane covers the surface of the lower circular groove of the electrolyte connecting chamber to prevent electrolyte evaporation; and the air cathode is concentric with the non-woven membrane to ensure that the air cathode is soaked with electrolyte.

[0027] Preferably, the glass fiber membrane is soaked with organic electrolyte LiTFSI: TEGDME = 1:1, the electrolyte connecting chamber is placed in the center of the glass fiber membrane, and the solid electrolyte membrane is in contact with the glass fiber membrane.

[0028] The utility model discloses the beneficial effect

[0029] The utility model discloses a novel improved mold structure, so that the double electrolyte lithium air battery is free from big and heavy mold. The button cell is the symbol of commercialization, and the mold uses the non-woven membrane pad under the air cathode to prevent electrolyte evaporation. The porous positive current collector ensures the transmission of air. The compact structure reduces the impedance of the mold. The space is reasonably utilized. The battery mold is low in cost, easy to assemble and flexible to adjust. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 It is the whole structure schematic diagram of button type double electrolyte lithium air battery mold.

[0031] Figure 2 It is the main view explosion diagram of battery structure.

[0032] Figure 3 It is the section view of battery structure.

[0033] Figure 4 It is the constant current constant volume charge and discharge test diagram in air environment.

[0034] In the drawing: 1 - open hole positive current collector, 2 - air cathode, 3 - non-woven fabric, 4 - electrolyte connecting chamber, 5 - solid electrolyte membrane, 6 - glass fiber membrane, 7 - lithium sheet, 8 - steel sheet, 9 - diaphragm spring, 10 - rubber sealing ring, 11 - negative electrode shell. DETAILED DESCRIPTION

[0035] AsFigures 1-3 The buckle type dual-electrolyte lithium-air battery mold shown includes a negative electrode shell 11, a diaphragm spring 9, a stainless steel gasket 8, a glass fiber membrane 6, a solid electrolyte membrane 5, an electrolyte connecting chamber 4, a non-woven fabric diaphragm 3, a rubber sealing ring 10, and a perforated positive electrode current collector 1; the perforated positive electrode current collector 1 is provided with regularly arranged air holes at the center thereof;

[0036] The electrolyte connecting chamber 4 is provided with a circular ring with upper and lower circular grooves, wherein the diameter of the lower circular groove is 12 mm and the groove depth is 1 mm, and the diameter of the upper circular groove is 16 mm and the groove depth is 0.1 mm;

[0037] The rubber sealing ring 10 is fixed outside the negative electrode shell 11, and the perforated positive electrode current collector 1 is buckled outside the rubber sealing ring;

[0038] The solid electrolyte membrane 5 is fixed in the lower circular groove of the electrolyte connecting chamber 4;

[0039] The non-woven fabric diaphragm 3 is fixed in the upper circular groove of the electrolyte connecting chamber 4;

[0040] The diaphragm spring 9 is arranged at the lower end of the stainless steel gasket for supporting the stainless steel gasket 8;

[0041] The circular lithium foil 7 is placed at the upper end of the stainless steel gasket 8;

[0042] The air positive electrode 2 is placed at the upper end of the non-woven fabric diaphragm 3.

[0043] The negative electrode shell 11, the diaphragm spring 9, the stainless steel gasket 8, and the perforated positive electrode current collector 1 are all made of stainless steel;

[0044] The rubber sealing ring 10 is made of rubber;

[0045] The solid electrolyte membrane 5 is a ceramic sheet;

[0046] The electrolyte connecting chamber 4 is made of an insulating material.

[0047] The outer ring of the negative electrode shell 11 is tightly covered by the rubber sealing ring 10;

[0048] The perforated positive electrode current collector is tightly buckled outside the rubber sealing ring by the sealing pressure of the buckle type battery sealing machine to ensure sealing, wherein the sealing pressure is 800 Pa and is maintained for 5 s.

[0049] The electrolyte connecting chamber 4 is processed by CNC to reduce the surface roughness.

[0050] The negative electrode shell 11, the diaphragm spring 9, the stainless steel gasket 8, and the perforated positive electrode current collector 1 are all made of stainless steel, and the rubber sealing ring 10 is made of rubber;

[0051] The solid electrolyte membrane 5 is Nasicon;

[0052] The electrolyte connecting chamber 4 is made of insulating material.

[0053] The outer circle of the negative electrode shell 11 is tightly covered by the rubber sealing ring 10.

[0054] The open positive electrode current collector is tightly fixed outside the rubber sealing ring by the packaging pressure of the press, and the packaging pressure is 800 Pa, maintained for 5 s.

[0055] The electrolyte connecting chamber 4 is processed by CNC to reduce the surface roughness.

[0056] The base of the battery positive electrode is carbon paper, carbon cloth or foamed nickel.

[0057] The solid electrolyte membrane 5 is Nasicon type inorganic solid-state electrolyte.

[0058] The solid electrolyte membrane 5 is fixed in the lower circular groove of the electrolyte connecting chamber 4 by epoxy resin.

[0059] The electrolyte connecting chamber 4 is filled with aqueous electrolyte inside when assembling the battery. The non-woven fabric diaphragm 3 is covered on the surface of the upper circular groove of the electrolyte connecting chamber to prevent electrolyte evaporation, and the air positive electrode 2 is concentric with the non-woven fabric diaphragm to ensure that the air positive electrode 2 is soaked with electrolyte.

[0060] The glass fiber membrane 6 is filled with organic electrolyte, and the proportion is LiTFSI:TEGDME=1:1. The electrolyte connecting chamber is placed in the center of the glass fiber membrane 6, and the solid electrolyte membrane 5 is in contact with the glass fiber membrane 6.

[0061] The assembly process of a button type dual-electrolyte lithium-air battery mold includes the following steps:

[0062] 1) Use epoxy resin to fix the solid electrolyte membrane 5 in the upper circular groove of the electrolyte connecting chamber 4, so that it protrudes slightly; place it at room temperature for more than 24 hours for standby, and confirm the sealing of the epoxy resin and the integrity of the solid electrolyte membrane 5 before use, that is, the connecting body a; require the processing factory to connect the rubber sealing ring 10 and the open positive electrode current collector 1 with interference fit, which is the connecting body b;

[0063] 2) Put the negative electrode shell 11, diaphragm spring 9, stainless steel gasket 8, glass fiber membrane 6, non-woven fabric diaphragm 3, open positive electrode current collector 1 and connecting body a, connecting body b into the glove box, and the whole battery assembly process is completed in the glove box with water and oxygen less than 0.1 ppm;

[0064] 3) Configuration of aqueous electrolyte and organic electrolyte; under air environment, lithium iodide is weighed, 5M lithium iodide aqueous electrolyte is configured, 1ml is taken out, sealed, cleaned multiple times, and then put into a glove box isolation cabin for standby. The organic electrolyte is lithium salt lithium bis-trifluoromethanesulfonimide and organic solvent tetraethylene glycol dimethyl ether, which are mixed in a molar ratio of 1:1 in a glove box;

[0065] 4) Using tweezers to lay the negative shell 11 flat, the diaphragm spring 9 is guaranteed to be concentric with the negative shell 11 and is placed inside, the large end is guaranteed to be on the top and the small end is guaranteed to be on the bottom, the stainless steel gasket 8 is laid on the diaphragm spring 9, the lithium sheet 7 is placed in the center of the stainless steel gasket 8, the glass fiber membrane 6 is placed on the lithium sheet 7, 80 microliters of electrolyte is extracted twice using a pipette, and the above-mentioned organic electrolyte is dropped into the glass fiber membrane 6; the electrolyte connecting chamber 4 is placed in the negative shell 11, the outer circle of the electrolyte connecting chamber 4 is consistent with the inner circle of the negative shell 11; 100 microliters of lithium iodide aqueous electrolyte is extracted twice using a pipette, so that it fills the inside of the electrolyte connecting chamber 4; the non-woven fabric diaphragm 3 is placed flat in the 16mm diameter groove of the electrolyte connecting chamber 4, which is guaranteed to be fully soaked in lithium iodide aqueous electrolyte, and there is no air bubble between the inner liquid surface of the electrolyte connecting chamber 4 and the non-woven fabric diaphragm 3; then the air positive electrode 2 active material side is buckled on the non-woven fabric diaphragm 3, so that the air positive electrode 2 is slightly soaked in lithium iodide aqueous electrolyte, to ensure the existence of the three-phase interface of the air positive electrode; then the open positive electrode current collector 1 is connected to the connector 2, and the battery assembly is completed; the negative electrode is at the bottom and the positive electrode is at the top, and the glove box is placed;

[0066] 4) After 24h, the battery is taken out of the glove box and placed on a constant temperature test platform.

[0067] 5) The assembled button type dual-electrolyte lithium air battery is subjected to constant current constant volume charge and discharge test, the protection voltage is 2V-4.5V, and the current density of the battery charge and discharge test is 0.1mA / cm 2 , the limit to the reverse capacity is 0.2mAh / cm 2 .

[0068] Figure 4 For constant volume charge and discharge test in air, it can be seen that the button type dual-electrolyte lithium air battery of the technical scheme has smaller overpotential and stable discharge platform. The figure fully illustrates that the button type dual-electrolyte lithium air battery has good electrochemical performance.

Claims

1. A button-type dual electrolyte lithium-air battery mold characterized by comprising: The negative electrode shell, diaphragm spring, stainless steel gasket, glass fiber membrane, solid electrolyte membrane, electrolyte connecting chamber, non-woven diaphragm, rubber sealing ring and open positive electrode current collector are included. The open positive electrode current collector is provided with regularly arranged air holes at the center thereof. The electrolyte connecting chamber is provided with a circular ring with upper and lower circular grooves, wherein the diameter of the lower circular groove is 14 mm and the groove depth is 1 mm, and the diameter of the upper circular groove is 16 mm and the groove depth is 0.1 mm. The rubber sealing ring is fixed outside the negative electrode shell, and the open positive electrode current collector is buckled outside the rubber sealing ring. The solid electrolyte membrane is fixed in the lower circular groove of the electrolyte connecting chamber. The non-woven diaphragm is fixed in the upper circular groove of the electrolyte connecting chamber. The diaphragm spring is arranged at the lower end of the stainless steel gasket for supporting the stainless steel gasket. The circular lithium foil is placed at the upper end of the stainless steel gasket. The air positive electrode is placed at the upper end of the non-woven diaphragm.

2. The buckle type dual electrolyte lithium-air battery cell mold according to claim 1, characterized in that, The negative electrode shell, diaphragm spring, stainless steel gasket and open positive electrode current collector are made of stainless steel. The rubber sealing ring is made of rubber. The solid electrolyte membrane is a ceramic sheet. The electrolyte connecting chamber is made of insulating material.

3. The buckle type dual electrolyte lithium-air battery cell mold according to claim 1, characterized in that, The outer circle of the negative electrode shell is tightly covered by the rubber sealing ring. The open positive electrode current collector is tightly buckled outside the rubber sealing ring by the packaging pressure of the button cell sealing machine to ensure sealing, wherein the packaging pressure is 800 Pa and is maintained for 5 s.

4. The buckle type dual electrolyte lithium-air battery cell mold according to claim 1, wherein, The electrolyte connecting chamber is processed by CNC to reduce the surface roughness.

5. The buckle type dual electrolyte lithium-air battery cell mold according to claim 1, wherein, The base of the air positive electrode is carbon paper, carbon cloth or foamed nickel.

6. The buckle type dual electrolyte lithium-air battery cell mold according to claim 1, wherein, The solid electrolyte membrane is a Nasicon-type inorganic solid-state electrolyte, a Lisicon-type inorganic solid-state electrolyte or a garnet-type solid-state electrolyte.

7. The buckle type dual electrolyte lithium-air battery cell mold according to claim 1, wherein, The solid electrolyte membrane is fixed in the lower circular groove of the electrolyte connecting chamber by resin.

8. The buckle type dual electrolyte lithium-air battery cell mold according to claim 1, wherein, Water-based electrolyte is filled in the electrolyte connecting chamber by using a pipette gun when assembling the battery. The non-woven diaphragm is covered on the surface of the upper circular groove of the electrolyte connecting chamber to prevent electrolyte evaporation.

9. The buckle type dual electrolyte lithium-air battery cell mold according to claim 1, wherein, The glass fiber membrane is filled with organic electrolyte, the electrolyte connecting chamber is placed in the center of the glass fiber membrane, and the solid electrolyte membrane is in contact with the glass fiber membrane.

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