Solid electrolyte membrane performance testing device and method

Abstract

The invention discloses a solid electrolyte membrane performance testing device and method. The solid electrolyte membrane performance testing device comprises a non-paired structure column head sleeve module, the non-paired structure column head sleeve module is composed of a pressure-bearing closed sleeve and two column heads matched with the pressure-bearing closed sleeve, the two column heads are respectively a first column head and a second column head, the diameter of the first column head is different from that of the second column head, and the diameter of the second column head is different from that of the pressure-bearing closed sleeve. And asymmetric through holes matched with the first column head and the second column head are coaxially formed in the pressure-bearing closed sleeve. Pressure is applied to the solid electrolyte membrane through the asymmetric column heads on the two sides of the sleeve, after the asymmetric column heads apply pressure, the solid electrolyte membrane deforms, and due to the fact that the diameters of the column heads are different, edge contact of the column heads can be avoided, and short circuit is prevented; after the solid electrolyte membrane containing the metal substrate is pressed, the edge of the metal substrate does not make contact with the column head with the small diameter.

Description

Technical Field

[0001] This invention relates to the field of solid electrolyte membrane testing technology, and in particular to a solid electrolyte membrane performance testing device and method. Background Technology

[0002] All-solid-state lithium batteries possess advantages such as high energy density and high safety performance, thus becoming an important development direction for lithium batteries. The ionic conductivity, electronic conductivity, and electrochemical stability window of the solid electrolyte itself all constrain the development of all-solid-state batteries, with the performance of the solid electrolyte membrane being the truly influential factor. Therefore, how to quickly and accurately evaluate the basic characteristics of the solid electrolyte membrane is of great significance for the production of solid-state batteries.

[0003] Solid electrolyte membrane testing currently utilizes symmetrical electrode mold battery devices to test the ionic conductivity, electronic conductivity, and electrochemical stability window of solid electrolyte powders. Symmetrical mold batteries use a large amount of electrolyte powder, forming an electrolyte powder blank with a thickness of 500 micrometers, effectively preventing short circuits caused by contact between symmetrical electrodes. However, for electrolyte membranes smaller than 100 micrometers, especially those smaller than 30 micrometers, the symmetrical device exhibits numerous short circuits between the edges of the electrode heads, making it impossible to effectively test the electrolyte membrane's performance. Furthermore, when a solid electrolyte membrane with a substrate is subjected to pressure, the electrolyte membrane and the substrate material deform differently, causing the solid electrolyte membrane to detach or misalign, thus affecting test data or rendering the test impossible. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings and defects of existing technologies by providing a solid electrolyte membrane performance testing device and method with an asymmetrical column head and sleeve for testing solid electrolyte membranes. The asymmetrical column head and sleeve device solves the technical bottleneck of existing symmetrical devices in terms of short circuits caused by interface pressure deformation, providing a standardized testing platform for the testing and research of solid electrolyte membranes.

[0005] One objective of this invention is to provide a solid electrolyte membrane performance testing device. The solid electrolyte membrane performance testing device includes an asymmetrical column head sleeve module. The asymmetrical column head sleeve module consists of a pressure-bearing sealed sleeve and two columns that cooperate with the pressure-bearing sealed sleeve. The two columns are a first column and a second column. The first column and the second column have different diameters, forming an asymmetrical structure. The pressure-bearing sealed sleeve has asymmetrical through holes arranged coaxially inside, which cooperate with the first column and the second column.

[0006] Preferably, the diameter of the first column head is larger than the diameter of the second column head, and the first column head is arranged above the second column head.

[0007] Preferably, the diameter ratio of the first spur head to the second spur head is between 1.2 and 2.

[0008] Preferably, the diameter of the first column head is 10mm-50mm, and the diameter of the second column head is 5mm-46mm.

[0009] Preferably, the asymmetric through hole includes a first hole portion that mates with the first column head, and a second hole portion that mates with the second column head.

[0010] Preferably, the asymmetric through hole and the column head are in clearance fit, and preferably, the diameter difference between the asymmetric through hole and the internal column head is 1 mm.

[0011] Preferably, the surface roughness Ra of the column head is ≤0.4 micrometers.

[0012] Preferably, the column head is made of stainless steel or titanium alloy, and the pressure-bearing sealing sleeve is made of PEEK or alumina.

[0013] Preferably, the upper end of the first column head is connected to the first fixing plate to form a T-shaped structure, and the first fixing plate leads out a first terminal block from its side. The lower end of the second column head is connected to the second fixing plate to form a T-shaped structure, and the second fixing plate leads out a second terminal block from its side.

[0014] Another object of the present invention is to provide a method for testing the performance of a solid electrolyte membrane, using the aforementioned solid electrolyte membrane performance testing device, comprising the following steps:

[0015] The solid electrolyte membrane is cut into a preset size; wherein the diameter of the solid electrolyte membrane is less than or equal to the diameter of the first column with a larger diameter and greater than the diameter of the second column with a smaller diameter, so that after the cut solid electrolyte membrane is placed in the pressure-bearing sealing sleeve, it can completely cover the channel area of ​​the second hole with a smaller diameter.

[0016] The cut solid electrolyte membrane is placed into the large-diameter first hole of the pressure-bearing sealing sleeve;

[0017] A first blocking electrode with the same inner diameter as the second pore is placed on the electrolyte membrane;

[0018] Insert the first column head into the first hole of the pressure-bearing sealing sleeve;

[0019] The second blocking electrode, which has the same inner diameter as the small diameter second hole of the pressure-bearing sealing sleeve, is placed into the second hole of the pressure-bearing sealing sleeve, and the second column head is inserted into the first hole of the pressure-bearing sealing sleeve.

[0020] A symmetrical mold battery was assembled by applying relative pressure to the first and second column heads. The two terminals were then connected to an electrochemical workstation to test the ionic conductivity impedance and potentiostatic resistance of the solid electrolyte membrane.

[0021] The solid electrolyte membrane performance testing device of the present invention applies pressure to the solid electrolyte membrane through asymmetrical pillars on both sides of the sleeve. After the asymmetrical pillars apply pressure, the solid electrolyte membrane deforms. Since the pillar diameters are different, the edge of the pillars can be avoided to prevent short circuits. Similarly, for solid electrolyte membranes containing metal substrates, after being pressed, the edge of the metal substrate does not contact the smaller diameter pillar. This solves the defect that symmetrical pillar devices can cause the solid electrolyte membrane to fall off and misalign, thus affecting the test data or making testing impossible. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of a solid electrolyte membrane performance testing device according to an embodiment of the present invention.

[0023] Figure 2 This is a schematic diagram of the first column of the solid electrolyte membrane performance testing device according to an embodiment of the present invention.

[0024] Figure 3 This is a schematic diagram of the second column of the solid electrolyte membrane performance testing device according to an embodiment of the present invention.

[0025] Figure 4 This is a schematic diagram of the pressure-bearing sealing sleeve of the solid electrolyte membrane performance testing device according to an embodiment of the present invention.

[0026] Figure 5 This is a schematic diagram of the testing principle of the solid electrolyte membrane performance testing device according to an embodiment of the present invention. Detailed Implementation

[0027] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0028] See Figure 1 As shown in the figure, in an exemplary embodiment of this application, the solid electrolyte membrane performance testing device includes an asymmetrical column head sleeve module. The asymmetrical column head sleeve module consists of a pressure-bearing sealed sleeve 1 and two columns that cooperate with the pressure-bearing sealed sleeve. The two columns are a first column head 2 and a second column head 3. The diameters of the first column head and the second column head are different, forming an asymmetrical structure. The pressure-bearing sealed sleeve has asymmetrical through holes arranged coaxially inside, which cooperate with the first column head and the second column head.

[0029] In an exemplary embodiment of this application, the ends of two post heads of different diameters are respectively connected to a fixing plate to form a T-shaped structure. Wiring terminals are led out from the sides of each fixing plate. Preferably, the wiring terminals use M3-M8 bolts, and more preferably, stainless steel M3 bolts. Figure 3 As shown, the upper end of the first column head is connected to the first fixing plate 21 to form a T-shaped structure, and the first terminal 4 is led out from the side of the first fixing plate. The lower end of the second column head is connected to the second fixing plate 31 to form a T-shaped structure, and the second terminal 5 is led out from the side of the second fixing plate.

[0030] By sequentially placing the cut solid electrolyte membrane, blocking electrode, and other materials into the asymmetric through-hole of the pressure-bearing sealed sleeve for assembly, a testable symmetric battery can be obtained.

[0031] In the above-described embodiment, the non-paired column head sleeve module, when used to test the performance of a solid electrolyte membrane, first places the solid electrolyte membrane inside the sleeve, inserts columns of different diameters into the sleeve and presses them onto both sides of the solid electrolyte membrane, and then unfolds the test. Compared with traditional testing equipment, it has advantages such as effectively avoiding short circuit problems that occur in symmetrical cells, and can effectively improve the success rate and accuracy of the test.

[0032] In some embodiments of this application, the diameter of the first column head 2 is larger than the diameter of the second column head 3, the first column head 2 is arranged above the second column head 3, and the axis of the pressure-bearing sealing sleeve 1 is arranged perpendicular to the horizontal plane. In some embodiments, the diameter of the first column head 2 is 10mm-50mm, and the diameter of the second column head 3 is 5mm-46mm.

[0033] In some embodiments of this application, the diameter ratio of the first column head 2 to the second column head 3 is between 1.2 and 2.

[0034] In some embodiments of this application, the asymmetric through hole includes a first hole portion 11 that mates with the first column head, and a second hole portion 12 that mates with the second column head. In some embodiments, the asymmetric through hole and the column head are in a clearance fit. Preferably, the diameter difference between the asymmetric through hole and the inner column head is 1 mm. Specifically, the first hole portion 11 is in a clearance fit with the first column head 2, with a diameter difference of 1 mm; the second hole portion 12 is in a clearance fit with the second column head 3, with a diameter difference of 1 mm.

[0035] In some embodiments, the surface roughness Ra of the column head (including the first column head and the second column head) is ≤0.4 micrometers.

[0036] In some embodiments, the column head (including the first column head and the second column head) is made of metal materials such as stainless steel or titanium alloy, and the pressure-bearing sealing sleeve is made of materials such as PEEK or alumina.

[0037] In some embodiments, a large-diameter first O-ring is fitted onto the first column head, and a small-diameter second O-ring that mates with the second column head is located in the second hole of the pressure-bearing sealing sleeve. Both the first and second O-rings are made of rubber.

[0038] This invention application also provides a method for testing the performance of a solid electrolyte membrane, using the aforementioned solid electrolyte membrane performance testing device, comprising the following steps:

[0039] The solid electrolyte membrane is cut into a preset size; wherein the diameter of the solid electrolyte membrane is less than or equal to the diameter of the first column with a larger diameter and greater than the diameter of the second column with a smaller diameter, so that after the cut solid electrolyte membrane is placed in the pressure-bearing sealing sleeve, it can completely cover the channel area of ​​the second hole with a smaller diameter.

[0040] The cut solid electrolyte membrane is placed into the large-diameter first hole of the pressure-bearing sealing sleeve;

[0041] A first blocking electrode with the same inner diameter as the second pore is placed on the electrolyte membrane;

[0042] Insert the first column head into the first hole of the pressure-bearing sealing sleeve;

[0043] The second blocking electrode, which has the same inner diameter as the small diameter second hole of the pressure-bearing sealing sleeve, is placed into the second hole of the pressure-bearing sealing sleeve, and the second column head is inserted into the first hole of the pressure-bearing sealing sleeve.

[0044] A symmetrical mold battery was assembled by applying relative pressure to the first and second column heads. The two terminals were then connected to an electrochemical workstation to test the ionic conductivity impedance and potentiostatic resistance of the solid electrolyte membrane.

[0045] Specifically, when applying pressure to the solid electrolyte membrane performance testing device 200 of this application, the following methods can be used: Figure 5 The structure shown is as follows: the second fixing plate of the second column head is placed on the base plate 120, and the first fixing plate of the first column head is connected to the pressure rod 110. The upper end of the pressure rod 110 is connected to the lead screw 100 and is located below the top plate. It can move vertically up and down by the lead screw to drive the first column head to move and apply force. The top plate is connected to the base plate by four support rods and is located above the base plate in the vertical direction. Figure 5 The structure shown is merely an example; specific pressure application devices can be designed or formed into different structures based on this principle.

[0046] Example 1

[0047] The first column head has a diameter of 20 mm, the second column head has a diameter of 10 mm, and the inner diameters of the two holes in the asymmetric through-hole inside the pressure-bearing sealing sleeve are 21 mm and 11 mm, respectively. An electrolyte membrane with a thickness of 30 μm and a diameter of 21 mm is placed inside the pressure-bearing sealing sleeve, and two blocking electrodes with diameters of 21 mm and 11 mm, respectively, are placed on both sides of the pressure-bearing sealing sleeve. The two columns are inserted into the inside of the pressure-bearing sealing sleeve.

[0048] The assembled components were pressurized to 400 MPa using a press, and the two terminals were connected to an electrochemical workstation to test the ionic conductivity impedance and potentiostatic resistance of the solid electrolyte membrane. The results of tests conducted at 25°C between 10 MHz and 1 Hz and at a constant potential of 0.5 V for 2 hours are recorded and are shown in Table 1.

[0049] Example 2

[0050] The first column head has a diameter of 20 mm, the second column head has a diameter of 12 mm, and the inner diameters of the two holes in the asymmetric through-hole inside the pressure-bearing sealing sleeve are 21 mm and 13 mm, respectively. An electrolyte membrane with a thickness of 30 μm and a diameter of 21 mm is placed inside the pressure-bearing sealing sleeve, and two blocking electrodes with diameters of 21 mm and 13 mm, respectively, are placed on both sides of the pressure-bearing sealing sleeve. The two columns are inserted into the inside of the pressure-bearing sealing sleeve.

[0051] The assembled components were pressurized to 400 MPa using a press, and the two terminals were connected to an electrochemical workstation to test the ionic conductivity, impedance, and potentiostatic resistance of the solid electrolyte membrane. Tests were conducted at 25°C between 10 MHz and 1 Hz, and the results of a 2-hour constant potential at 0.5 V were recorded and are shown in Table 1.

[0052] Example 3

[0053] The first column head has a diameter of 20 mm, the second column head has a diameter of 14 mm, and the inner diameters of the two holes in the asymmetric through-hole inside the pressure-bearing sealing sleeve are 21 mm and 15 mm, respectively. An electrolyte membrane with a thickness of 30 μm and a diameter of 21 mm is placed inside the pressure-bearing sealing sleeve, and two blocking electrodes with diameters of 21 mm and 15 mm, respectively, are placed on both sides of the pressure-bearing sealing sleeve. The two columns are inserted into the inside of the pressure-bearing sealing sleeve.

[0054] The assembled components were pressurized to 400 MPa using a press, and the two terminals were connected to an electrochemical workstation to test the ionic conductivity, impedance, and potentiostatic resistance of the solid electrolyte membrane. Tests were conducted at 25°C between 10 MHz and 1 Hz, and the results of a 2-hour constant potential at 0.5 V were recorded and are shown in Table 1.

[0055] Example 4

[0056] The first column head has a diameter of 20 mm, the second column head has a diameter of 16 mm, and the inner diameters of the two holes in the asymmetric through-hole inside the pressure-bearing sealing sleeve are 21 mm and 17 mm, respectively. An electrolyte membrane with a thickness of 30 μm and a diameter of 21 mm is placed inside the pressure-bearing sealing sleeve, and two blocking electrodes with diameters of 21 mm and 17 mm, respectively, are placed on both sides of the pressure-bearing sealing sleeve. The two columns are inserted into the inside of the pressure-bearing sealing sleeve.

[0057] The assembled components were pressurized to 400 MPa using a press, and the two terminals were connected to an electrochemical workstation to test the ionic conductivity, impedance, and potentiostatic resistance of the solid electrolyte membrane. Tests were conducted at 25°C between 10 MHz and 1 Hz, and the results of a 2-hour constant potential at 0.5 V were recorded and are shown in Table 1.

[0058] Example 5

[0059] The first column head has a diameter of 20 mm, the second column head has a diameter of 18 mm, and the inner diameters of the two holes in the asymmetric through-hole inside the pressure-bearing sealing sleeve are 21 mm and 19 mm, respectively. An electrolyte membrane with a thickness of 30 μm and a diameter of 21 mm is placed inside the pressure-bearing sealing sleeve, and two blocking electrodes with diameters of 21 mm and 19 mm, respectively, are placed on both sides of the pressure-bearing sealing sleeve. The two columns are inserted into the inside of the pressure-bearing sealing sleeve.

[0060] The assembled components were pressurized to 400 MPa using a press, and the two terminals were connected to an electrochemical workstation to test the ionic conductivity, impedance, and potentiostatic resistance of the solid electrolyte membrane. Tests were conducted at 25°C between 10 MHz and 1 Hz, and the results of a 2-hour constant potential at 0.5 V were recorded and are shown in Table 1.

[0061] Example 6

[0062] The first column head has a diameter of 50 mm, the second column head has a diameter of 10 mm, and the inner diameters of the two holes in the asymmetric through-hole inside the pressure-bearing sealing sleeve are 21 mm and 11 mm, respectively. An electrolyte membrane with a thickness of 30 μm and a diameter of 51 mm is placed inside the pressure-bearing sealing sleeve, and two blocking electrodes with diameters of 21 mm and 11 mm, respectively, are placed on both sides of the pressure-bearing sealing sleeve. The two columns are inserted into the inside of the pressure-bearing sealing sleeve.

[0063] The assembled components were pressurized to 400 MPa using a press, and the two terminals were connected to an electrochemical workstation to test the ionic conductivity, impedance, and potentiostatic resistance of the solid electrolyte membrane. Tests were conducted at 25°C between 10 MHz and 1 Hz, and the results of a 2-hour constant potential at 0.5 V were recorded and are shown in Table 1.

[0064] Example 7

[0065] The first column head has a diameter of 50 mm, the second column head has a diameter of 25 mm, and the inner diameters of the two holes in the asymmetric through-hole inside the pressure-bearing sealing sleeve are 51 mm and 26 mm, respectively. An electrolyte membrane with a thickness of 30 μm and a diameter of 51 mm is placed inside the pressure-bearing sealing sleeve, and two blocking electrodes with diameters of 51 mm and 26 mm, respectively, are placed on both sides of the sleeve. The two columns are then inserted into the inside of the pressure-bearing sealing sleeve.

[0066] The assembled components were pressurized to 400 MPa using a press, and the two terminals were connected to an electrochemical workstation to test the ionic conductivity, impedance, and potentiostatic resistance of the solid electrolyte membrane. Tests were conducted at 25°C between 10 MHz and 1 Hz, and the results of a 2-hour constant potential at 0.5 V were recorded and are shown in Table 1.

[0067] Example 8

[0068] The first column head has a diameter of 50 mm, the second column head has a diameter of 40 mm, and the inner diameters of the two holes in the asymmetric through-hole inside the pressure-bearing sealing sleeve are 51 mm and 41 mm, respectively. An electrolyte membrane with a thickness of 30 μm and a diameter of 51 mm is placed inside the pressure-bearing sealing sleeve, and two blocking electrodes with diameters of 51 mm and 41 mm, respectively, are placed on both sides of the pressure-bearing sealing sleeve. The two columns are inserted into the inside of the pressure-bearing sealing sleeve.

[0069] The assembled components were pressurized to 400 MPa using a press, and the two terminals were connected to an electrochemical workstation to test the ionic conductivity, impedance, and potentiostatic resistance of the solid electrolyte membrane. Tests were conducted at 25°C between 10 MHz and 1 Hz, and the results of a 2-hour constant potential at 0.5 V were recorded and are shown in Table 1.

[0070] Example 9

[0071] The first column head has a diameter of 40 mm, the second column head has a diameter of 20 mm, and the inner diameters of the two holes in the asymmetric through-hole inside the pressure-bearing sealing sleeve are 41 mm and 21 mm, respectively. An electrolyte membrane with a thickness of 30 μm and a diameter of 41 mm is placed inside the pressure-bearing sealing sleeve, and two blocking electrodes with diameters of 41 mm and 21 mm, respectively, are placed on both sides of the pressure-bearing sealing sleeve. The two columns are inserted into the inside of the pressure-bearing sealing sleeve.

[0072] The assembled components were pressurized to 400 MPa using a press, and the two terminals were connected to an electrochemical workstation to test the ionic conductivity, impedance, and potentiostatic resistance of the solid electrolyte membrane. Tests were conducted at 25°C between 10 MHz and 1 Hz, and the results of a 2-hour constant potential at 0.5 V were recorded and are shown in Table 1.

[0073] Example 10

[0074] The first column head has a diameter of 20 mm, the second column head has a diameter of 10 mm, and the inner diameters of the two holes in the asymmetric through-hole inside the pressure-bearing sealing sleeve are 21 mm and 11 mm, respectively. An electrolyte membrane with a thickness of 30 μm and a diameter of 21 mm is placed inside the pressure-bearing sealing sleeve. A lithium metal sheet is placed in the smaller diameter second hole inside the pressure-bearing sealing sleeve. Then, two blocking electrodes with diameters of 21 mm and 11 mm, respectively, are placed on both sides of the pressure-bearing sealing sleeve, and the two columns are inserted into the inside of the pressure-bearing sealing sleeve.

[0075] The assembled components were pressurized to 50 MPa using a press, and the two terminals were connected to an electrochemical workstation to test the electrochemical window of the solid electrolyte membrane. Tests were performed at 25°C between the initial potential and 6V and between the initial potential and 0V, with results recorded as 5 μA / cm. 2 The potential values ​​are shown in Table 2.

[0076] Comparative Example 1

[0077] The first column head has a diameter of 10 mm, the second column head has a diameter of 10 mm, and the inner diameters of the two symmetrical through holes in the pressure-bearing sealing sleeve are 11 mm and 11 mm, respectively. An electrolyte membrane with a thickness of 30 μm and a diameter of 11 mm is placed into the pressure-bearing sealing sleeve, and two blocking electrodes with diameters of 11 mm and 11 mm, respectively, are placed on both sides of the pressure-bearing sealing sleeve. The two columns are inserted into the inside of the pressure-bearing sealing sleeve.

[0078] The assembled components were pressurized to 400 MPa using a press, and the two terminals were connected to an electrochemical workstation to test the ionic conductivity, impedance, and potentiostatic resistance of the solid electrolyte membrane. Tests were conducted at 25°C between 10 MHz and 1 Hz, and the results of a 2-hour constant potential at 0.5 V were recorded and are shown in Table 1.

[0079] Comparative Example 2

[0080] The first and second column heads are both 10 mm in diameter. The inner diameters of the two symmetrical through holes inside the pressure-bearing sealing sleeve are 11 mm and 11 mm, respectively. An electrolyte membrane with a thickness of 30 μm and a diameter of 10 mm is placed inside the pressure-bearing sealing sleeve. Two blocking electrodes with diameters of 10 mm and 10 mm, respectively, are placed on both sides of the pressure-bearing sealing sleeve. The two column heads of the same diameter are then inserted into the pressure-bearing sealing sleeve.

[0081] The assembled components were pressurized to 400 MPa using a press, and the two terminals were connected to an electrochemical workstation to test the ionic conductivity, impedance, and potentiostatic resistance of the solid electrolyte membrane. Tests were conducted at 25°C between 10 MHz and 1 Hz, and the results of a 2-hour constant potential at 0.5 V were recorded and are shown in Table 1.

[0082] Comparative Example 3

[0083] The first and second column heads are both 10 mm in diameter. The inner diameters of the two symmetrical through holes inside the pressure-bearing sealing sleeve are 11 mm and 11 mm, respectively. An electrolyte membrane with a thickness of 30 μm and a diameter of 11 mm is placed inside the pressure-bearing sealing sleeve. A lithium metal sheet is placed in the inner hole of the pressure-bearing sealing sleeve that mates with the second column head. Then, two blocking electrodes with diameters of 11 mm and 11 mm, respectively, are placed on both sides of the pressure-bearing sealing sleeve. The two columns with the same diameter are then inserted into the pressure-bearing sealing sleeve.

[0084] The assembled components were pressurized to 50 MPa using a press, and the two terminals were connected to an electrochemical workstation to test the electrochemical window of the solid electrolyte membrane. Tests were performed at 25°C between the initial potential and 6V and between the initial potential and 0V, with results recorded as 5 μA / cm. 2 The potential values ​​are shown in Table 2.

[0085] Table 1

[0086]

[0087] Table 2

[0088] Example 10 Comparative Example 3 Oxidation potential (V) 5.5 Short circuit Reduction potential (V) 0.8 Short circuit

[0089] As can be seen from the above, the device for testing the performance of solid electrolyte membranes using an asymmetric column sleeve according to the embodiments of this application can effectively avoid short circuit problems that occur when manufacturing symmetrical batteries. At the same time, it can prevent short circuit problems caused by deformation and edge shedding of solid electrolyte membranes containing metal substrates under pressure. It can effectively improve the accuracy and effectiveness of solid electrolyte membrane testing and provide a more reliable method for evaluating the performance of solid electrolyte membranes.

[0090] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. It will be apparent to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention.

[0091] Therefore, the embodiments should be regarded as exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of the equivalents of the claims be included within the invention.

[0092] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A solid electrolyte membrane performance testing device, characterized in that, The solid electrolyte membrane performance testing device includes an asymmetrical column head sleeve module, which consists of a pressure-bearing sealed sleeve and two columns that cooperate with the pressure-bearing sealed sleeve. The two columns are a first column and a second column, and the first column and the second column have different diameters, forming an asymmetrical structure. The pressure-bearing sealed sleeve has asymmetrical through holes arranged coaxially inside, which cooperate with the first column and the second column.

2. The solid electrolyte membrane performance testing device according to claim 1, characterized in that, The diameter of the first column head is larger than the diameter of the second column head, and the first column head is positioned above the second column head.

3. The solid electrolyte membrane performance testing device according to claim 2, characterized in that, The diameter ratio of the first spur to the second spur is between 1.2 and 2.

4. The solid electrolyte membrane performance testing device according to claim 3, characterized in that, The diameter of the first spur head is between 10mm and 50mm, and the diameter of the second spur head is between 5mm and 46mm.

5. The solid electrolyte membrane performance testing device according to claim 1, characterized in that, The asymmetric through hole includes a first hole portion that mates with the first column head, and a second hole portion that mates with the second column head.

6. The solid electrolyte membrane performance testing device according to claim 5, characterized in that, The asymmetric through hole is clearance-fitted with the column head. Preferably, the diameter of the asymmetric through hole differs from that of the internal column head by 1 mm.

7. The solid electrolyte membrane performance testing device according to claim 1, characterized in that, The surface roughness Ra of the column head is ≤0.4 micrometers.

8. The solid electrolyte membrane performance testing device according to claim 1, characterized in that, The column head is made of stainless steel or titanium alloy, and the pressure-bearing sealed sleeve is made of PEEK or alumina.

9. The solid electrolyte membrane performance testing device according to claim 1, characterized in that, The upper end of the first column is connected to the first fixing plate to form a T-shaped structure. A first terminal is led out from the side of the first fixing plate. The lower end of the second column is connected to the second fixing plate to form a T-shaped structure. A second terminal is led out from the side of the second fixing plate.

10. A method for testing the performance of solid electrolyte membranes, characterized in that, The solid electrolyte membrane performance testing apparatus according to any one of claims 1-9 is used, comprising the following steps: The solid electrolyte membrane is cut into a preset size; wherein the diameter of the solid electrolyte membrane is less than or equal to the diameter of the first column with a larger diameter and greater than the diameter of the second column with a smaller diameter, so that after the cut solid electrolyte membrane is placed in the pressure-bearing sealing sleeve, it can completely cover the channel area of ​​the second hole with a smaller diameter. The cut solid electrolyte membrane is placed into the large-diameter first hole of the pressure-bearing sealing sleeve; A first blocking electrode with the same inner diameter as the second pore is placed on the electrolyte membrane; Insert the first column head into the first hole of the pressure-bearing sealing sleeve; The second blocking electrode, which has the same inner diameter as the small diameter second hole of the pressure-bearing sealing sleeve, is placed into the second hole of the pressure-bearing sealing sleeve, and the second column head is inserted into the first hole of the pressure-bearing sealing sleeve. A symmetrical mold battery was assembled by applying relative pressure to the first and second column heads. The two terminals were then connected to an electrochemical workstation to test the ionic conductivity impedance and potentiostatic resistance of the solid electrolyte membrane.

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