Method for preparing a membrane electrode assembly

Abstract

This invention discloses a method for preparing a membrane electrode assembly, comprising: preparing a first catalyst transfer membrane and a second catalyst transfer membrane; placing the first catalyst transfer membrane on one side of a first protective membrane; peeling off the protective layer of an electrolyte membrane to form an electrolyte membrane, and placing the electrolyte membrane on auxiliary paper, with the side of the electrolyte membrane facing away from the auxiliary paper placed on the side of the first catalyst transfer membrane facing away from the first protective membrane, so that the auxiliary paper assists the electrolyte membrane in adhering to the first catalyst transfer membrane; peeling the auxiliary paper off the electrolyte membrane; sequentially placing the second catalyst transfer membrane and the second protective membrane on the side of the electrolyte membrane facing away from the first catalyst transfer membrane to form a pre-fabricated membrane electrode assembly; and obtaining the final membrane electrode assembly through the pre-fabricated membrane electrode assembly. The membrane electrode assembly preparation method of this invention results in a relatively complete catalyst layer transferred to the electrolyte membrane, leading to good performance of the membrane electrode assembly.

Description

Technical Field

[0001] This invention relates to the field of electrochemical battery technology, and in particular to a method for preparing a membrane electrode assembly. Background Technology

[0002] Transfer printing, as one of the methods for manufacturing electrolyte membranes with catalyst layers, has attracted attention due to its simplicity and the absence of concerns about membrane swelling issues similar to those in spraying methods. In existing technologies, the electrolyte membrane is peeled and unfolded using roll tension before being bonded to the transfer film. However, the unfolding effect is poor, severely impacting electrochemical performance, and there is room for improvement. Summary of the Invention

[0003] The present invention aims to at least solve one of the technical problems existing in the prior art. Therefore, one object of the present invention is to provide a method for preparing a membrane electrode assembly that improves the transfer effect of the catalyst layer, thereby enabling the preparation of a membrane electrode assembly with a uniform catalyst layer.

[0004] According to an embodiment of the present invention, a method for preparing a membrane electrode assembly includes: preparing a first catalyst transfer membrane and a second catalyst transfer membrane; placing the first catalyst transfer membrane on one side of a first protective membrane; peeling off the protective layer of an electrolyte membrane to form an electrolyte membrane, and placing the electrolyte membrane on auxiliary paper, with the side of the electrolyte membrane facing away from the auxiliary paper placed on the side of the first catalyst transfer membrane facing away from the first protective membrane, so that the auxiliary paper assists in adhering the electrolyte membrane to the first catalyst transfer membrane; peeling the auxiliary paper off the electrolyte membrane; sequentially placing the second catalyst transfer membrane and the second protective membrane on the side of the electrolyte membrane facing away from the first catalyst transfer membrane to form a pre-fabricated membrane electrode assembly; and obtaining a final membrane electrode assembly from the pre-fabricated membrane electrode assembly.

[0005] According to the preparation method of the membrane electrode assembly of the present invention, the catalyst layer transferred to the electrolyte membrane is relatively complete, and the membrane electrode assembly has good performance.

[0006] According to a method for preparing a membrane electrode assembly according to some embodiments of the present invention, after the electrolyte membrane is placed on auxiliary paper, a flattening operation is performed to make the electrolyte membrane adhere to the first catalyst transfer film.

[0007] According to some embodiments of the present invention, in the preparation method of the membrane electrode assembly, the auxiliary paper is any one of weighing paper, sulfuric acid paper, printing paper, and wax paper.

[0008] According to some embodiments of the present invention, in the method for preparing a membrane electrode assembly, the size of the electrolyte membrane is greater than or equal to the size of the first catalyst transfer membrane, and / or the first catalyst transfer membrane and the second catalyst transfer membrane have the same size.

[0009] According to a method for preparing a membrane electrode assembly according to some embodiments of the present invention, both the first catalyst transfer film and the second catalyst transfer film include a substrate layer and a catalyst layer; wherein the substrate layer of the first catalyst transfer film is bonded to the first protective film and the catalyst layer is bonded to a first side of the electrolyte membrane, and the substrate layer of the second catalyst transfer film is bonded to the second protective film and the catalyst layer is bonded to a second side of the electrolyte membrane.

[0010] According to some embodiments of the present invention, the substrate layer is any one of a fluorine film, a PTFE film, an e-PTFE film, and a PI film based on PET.

[0011] According to some embodiments of the present invention, the method for preparing a membrane electrode assembly includes obtaining a final membrane electrode assembly from a pre-prepared membrane electrode assembly by: setting transfer conditions; controlling a hot press to transfer the pre-prepared membrane electrode assembly under the transfer conditions; and peeling off the transferred pre-prepared membrane electrode assembly to obtain the final membrane electrode assembly.

[0012] According to some embodiments of the present invention, in the method for preparing a membrane electrode assembly, the transfer conditions are T, F, and t, which satisfy the following: 100℃≤T≤170℃, 8Kgf / cm2≤F≤16Kgf / cm2, and 20s≤t≤150s.

[0013] According to some embodiments of the present invention, the method for preparing a membrane electrode assembly includes preparing a first catalyst transfer membrane and a second catalyst transfer membrane by stamping a substrate layer having a catalyst layer using a stamping machine to obtain the first catalyst transfer membrane and the second catalyst transfer membrane, respectively.

[0014] According to some embodiments of the present invention, in the method for preparing a membrane electrode assembly, the first catalyst transfer film and / or the second protective film are any one of PI film, PET film and PEN film.

[0015] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0016] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0017] Figure 1 This is a flowchart of a method for preparing a membrane electrode assembly according to an embodiment of the present invention;

[0018] Figure 2 This is an overall flowchart of a method for preparing a membrane electrode assembly according to an embodiment of the present invention;

[0019] Figure 3 This is a structural diagram of a pre-fabricated membrane electrode assembly in a method for preparing a membrane electrode assembly according to an embodiment of the present invention.

[0020] Figure label:

[0021] Pre-fabricated membrane electrode assembly 100,

[0022] First protective film 1, first catalyst transfer film 2, electrolyte film 3, second catalyst transfer film 4, second protective film 5. Detailed Implementation

[0023] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0024] The following is for reference. Figures 1-3 A method for preparing a membrane electrode assembly according to an embodiment of the present invention is described.

[0025] like Figure 1 As shown, the fabrication method of the membrane electrode assembly according to an embodiment of the present invention includes:

[0026] S10: Prepare the first catalyst transfer membrane 2 and the second catalyst transfer membrane 4. That is, by preparing a catalyst coating and uniformly coating the catalyst coating onto one side of the transfer membrane, a catalyst layer is constructed on one side of the transfer membrane. The transfer membrane is further processed according to the desired shape of the catalyst layer to obtain the first catalyst transfer membrane 2 and the second catalyst transfer membrane 4, thereby enabling the catalyst layer to be successfully transferred onto the electrolyte membrane 3.

[0027] S20: Place the first catalyst transfer film 2 on one side of the first protective film 1. That is, as... Figure 3 As shown, the first protective film 1 is first laid flat on the platform. The platform can be a clean platform, preferably a clean glass plate, and the first protective film 1 is kept fixed to facilitate further processing. At this time, the first catalyst transfer film 2 is placed on the upper side of the first protective film 1, with the side of the first catalyst transfer film 2 with the catalyst coating layer facing up, so as to facilitate transfer.

[0028] S30: Peel off the protective layer of the electrolyte membrane to be used to form electrolyte membrane 3, and place electrolyte membrane 3 on auxiliary paper. Place the side of electrolyte membrane 3 away from the auxiliary paper on the side of the first catalyst transfer film 2 away from the first protective film 1, so that the auxiliary paper helps electrolyte membrane 3 to adhere to the first catalyst transfer film 2.

[0029] Among them, the electrolyte membrane 3 is a proton exchange membrane with a protective layer. The proton exchange membrane has a certain degree of viscosity. By setting the protective layer, the proton exchange membrane can be prevented from folding and sticking together. It can also protect the proton exchange membrane during storage and transportation, preventing scratches or damage to the proton exchange membrane, thereby improving the quality of the electrolyte membrane 3.

[0030] It should be noted that, due to the thinness of the electrolyte membrane 3 and its high sensitivity to temperature and humidity, the electrolyte membrane 3 is prone to deformation under tensile stress during the peeling process of its protective layer, resulting in wrinkles or even folding and adhesion, thus affecting the transfer effect. The auxiliary paper, possessing a certain degree of stiffness, is not easily bent, does not shed lint, and is transparent. When the electrolyte membrane is placed on the auxiliary paper, it prevents the electrolyte membrane from self-adheding and allows the electrolyte membrane to be unfolded on the auxiliary paper, enabling the catalyst layer to adhere to the electrolyte membrane. Therefore, after the protective layer of the electrolyte membrane to be used is peeled off to form the electrolyte membrane 3, the electrolyte membrane 3 can be adhered to the auxiliary paper, allowing the electrolyte membrane 3 to be flattened.

[0031] Furthermore, the electrolyte membrane is placed on the first catalyst transfer membrane 2, such that the auxiliary paper is located on the side of the electrolyte membrane away from the first catalyst transfer membrane 2, and the other side of the electrolyte membrane is attached to the catalyst layer of the first catalyst transfer membrane 2, so that the catalyst layer can be transferred onto the electrolyte membrane 3.

[0032] With the above settings, the electrolyte membrane 3 can be unfolded on the auxiliary paper, and the auxiliary paper can support the electrolyte membrane 3 during the bonding process, so that the electrolyte membrane 3 can better adhere to the catalyst layer of the first catalyst transfer membrane 2. Especially when the electrolyte membrane 3 has a large size, it can effectively prevent the electrolyte membrane 3 from folding and sticking, thereby improving the transfer effect of the catalyst layer.

[0033] S40: Peel the auxiliary paper off the electrolyte membrane 3. That is, after the electrolyte membrane 3 is attached to the first catalyst transfer membrane 2, the electrolyte membrane 3 is fixed to the catalyst layer. At this time, the auxiliary paper can be peeled off by tweezers or other tools, so that the catalyst layer of the second catalyst transfer membrane 4 can be attached to the other side of the electrolyte membrane 3, thereby achieving transfer on both sides of the electrolyte membrane 3.

[0034] S50: The second catalyst transfer film 4 and the second protective film 5 are sequentially placed on the side of the electrolyte membrane 3 away from the first catalyst transfer film 2 to form a pre-fabricated membrane electrode assembly 100. That is, as... Figure 3 As shown, after the electrolyte membrane 3 is placed on the first catalyst transfer membrane 2 and the auxiliary paper is peeled off, the second catalyst transfer membrane 4 and the second protective membrane 5 are stacked on the upper side of the electrolyte membrane 3 in sequence, and the catalyst layer of the second catalyst transfer membrane 4 is attached to the side of the electrolyte membrane 3, thereby forming a pre-fabricated membrane electrode assembly 100 consisting of the second protective membrane 5, the second catalyst transfer membrane 4, the electrolyte membrane 3, the first catalyst transfer membrane 2, and the first protective membrane 1 stacked from top to bottom.

[0035] Thus, the catalyst layers of the second catalyst transfer film 4 and the first catalyst transfer film 2 are attached to both sides of the electrolyte membrane 3 for transfer, and the first protective film 1 and the second protective film 5 can protect the pre-formed membrane electrode assembly 100, so that the pre-formed membrane electrode assembly 100 can be further processed under relatively stable conditions, which is beneficial to improving the transfer effect.

[0036] S60: Obtain the final membrane electrode assembly through the pre-fabricated membrane electrode assembly 100. That is, by performing a transfer process on the pre-fabricated membrane electrode assembly 100, the catalyst layers of the second catalyst transfer membrane 4 and the first catalyst transfer membrane 2 are transferred to both sides of the electrolyte membrane 3 to construct the final membrane electrode assembly.

[0037] It should be noted that the entire transfer process is carried out in a clean room, where the temperature is maintained between 20℃ and 30℃ and the humidity is maintained between 45% and 60% to reduce the interference of temperature and humidity on the electrolyte membrane 3 and improve the transfer effect.

[0038] According to the method for preparing a membrane electrode assembly according to an embodiment of the present invention, an electrolyte membrane 3 is formed by peeling off the protective layer of the electrolyte membrane to be used, unfolding the electrolyte membrane 3 on an auxiliary paper, and using the auxiliary paper to drive the electrolyte membrane 3 to be attached and installed, so that the second catalyst transfer film 4 and the first catalyst transfer film 2 can be better attached to both sides of the electrolyte membrane 3, so that the catalyst layer can be better transferred to the electrolyte membrane 3, thereby manufacturing a final membrane electrode assembly with a uniform catalyst layer, so that the membrane electrode assembly has good performance.

[0039] In some embodiments, after the electrolyte membrane 3 is placed on the auxiliary paper, a flattening operation is performed to adhere the electrolyte membrane 3 to the first catalyst transfer film 2. That is, the auxiliary paper is fixed on a platform, and after peeling off the protective layer of the electrolyte membrane to be used, the resulting electrolyte membrane 3 will have wrinkles. The electrolyte membrane 3 is placed on the auxiliary paper, and tools such as tweezers are used to adhere the electrolyte membrane 3 to the auxiliary paper, thereby unfolding the electrolyte membrane 3. Further, the electrolyte membrane 3 is moved to the upper side of the first catalyst transfer film 2, and the side of the electrolyte membrane 3 away from the auxiliary paper is adhered to the first catalyst transfer film 2, so that the catalyst layer adheres to the electrolyte membrane 3 to achieve transfer.

[0040] In some embodiments, the auxiliary paper is any one of weighing paper, sulfuric acid paper, printing paper, or wax paper. It is understood that users can select the auxiliary paper based on the size of the electrolyte membrane 3 and the desired effect, and can determine the specific operating process based on the properties of the auxiliary paper, so that the electrolyte membrane 3 can be spread out as much as possible, thereby improving the transfer effect of the catalyst layer and enhancing the performance of the membrane electrode assembly.

[0041] In some embodiments, the size of the electrolyte membrane 3 is greater than or equal to the size of the first catalyst transfer membrane 2, and / or the first catalyst transfer membrane 2 and the second catalyst transfer membrane 4 have the same size. That is, the size of the electrolyte membrane 3 can be set to be greater than the size of the first catalyst transfer membrane 2, or the size of the electrolyte membrane 3 can be set to be equal to the size of the first catalyst transfer membrane 2; alternatively, the size of the first catalyst transfer membrane 2 and the second catalyst transfer membrane 4 can be set to be the same, or the size of the first catalyst transfer membrane 2 and the second catalyst transfer membrane 4 can be set to be different.

[0042] Preferably, the size of the electrolyte membrane 3 can be set to be larger than the size of the first catalyst transfer membrane 2, and the first catalyst transfer membrane 2 and the second catalyst transfer membrane 4 can be the same size. This arrangement ensures that the first catalyst transfer membrane 2 and the second catalyst transfer membrane 4 can be completely adhered to both sides of the electrolyte membrane 3, guaranteeing complete transfer of the catalyst layer to the electrolyte membrane 3. Simultaneously, it ensures that the catalyst layers on both sides of the electrolyte membrane 3 are identical, thus guaranteeing good performance of the electrolyte membrane 3.

[0043] Furthermore, the size of the auxiliary paper is larger than that of the electrolyte membrane 3, which allows the electrolyte membrane 3 to be fully unfolded on the auxiliary paper, and reduces the precision requirements for the first catalyst transfer film 2 to be adhered to the auxiliary paper, thus reducing the difficulty of operation.

[0044] In some embodiments, both the first catalyst transfer film 2 and the second catalyst transfer film 4 include a substrate layer and a catalyst layer. It should be noted that the catalyst layer can be constructed on the substrate layer by coating one side of the substrate layer with a catalyst coating. Specifically, the substrate layer of the first catalyst transfer film 2 is bonded to the first protective film 1, and the catalyst layer is bonded to the first side of the electrolyte membrane 3; similarly, the substrate layer of the second catalyst transfer film 4 is bonded to the second protective film 5, and the catalyst layer is bonded to the second side of the electrolyte membrane 3.

[0045] In other words, such as Figure 3 As shown, by attaching the catalyst layers of the first catalyst transfer film 2 and the second catalyst transfer film 4 to both sides of the electrolyte membrane 3 after the auxiliary paper has been removed, the catalyst layer can be transferred to the electrolyte membrane 3, thereby constructing a membrane electrode assembly. At the same time, by separating the catalyst layer from the first protective film 1 and the second protective film 5 through the substrate film, the catalyst layer can be completely transferred to the electrolyte membrane 3, thereby improving the performance of the membrane electrode assembly.

[0046] In some embodiments, the substrate layer is any one of a fluorine membrane, PTFE membrane, e-PTFE membrane, and PI membrane based on PET. It is understood that the substrate layer can be selected based on the composition and properties of the catalyst coating, such as using a PTFE membrane, an e-PTFE membrane, or a PI membrane as the substrate layer. This ensures the catalyst layer remains stably on the substrate layer, preventing catalyst layer detachment during the assembly of the prefabricated membrane electrode assembly 100, and ensuring complete transfer of the catalyst layer to the electrolyte membrane 3 during the transfer process, thereby improving the performance of the membrane electrode assembly. It should be noted that the selection of the substrate layer is not limited to the aforementioned membrane materials; any membrane material that enables successful transfer of the catalyst layer to the electrolyte membrane and remains stable without deformation under the transfer temperature conditions can be used as the substrate layer.

[0047] In some embodiments, obtaining the final membrane electrode assembly through the prefabricated membrane electrode assembly 100 includes:

[0048] S61: Set the transfer conditions. That is, the transfer conditions usually include transfer temperature, transfer pressure and transfer time. These can be set according to the size and thickness of the catalyst layer and the experience of the technicians to set appropriate transfer temperature, transfer pressure and transfer time, so as to ensure that the catalyst layers of the first catalyst transfer film 2 and the second catalyst transfer film 4 can be completely transferred to the side of the electrolyte membrane 3.

[0049] S62: Control the hot press to transfer the pre-formed film electrode assembly 100 under transfer conditions. That is, after the transfer conditions are set, the pre-formed film electrode assembly 100 is placed in the hot press, and the hot press is controlled to work to transfer the catalyst layer of the first catalyst transfer film 2 and the second catalyst transfer film 4 to the side of the electrolyte membrane 3.

[0050] S63: The pre-fabricated membrane electrode assembly 100 after transfer is peeled off to obtain the final membrane electrode assembly. That is, after the transfer is completed, the substrate film of the second protective film 5 and the second catalyst transfer film 4 is peeled off in sequence to peel off the electrolyte membrane 3 with catalyst layers on both sides, thereby obtaining the final membrane electrode assembly. Thus, the transfer processing of the membrane electrode assembly is realized.

[0051] In some embodiments, the transfer conditions, namely the transfer temperature T, the transfer pressure F, and the transfer time t, satisfy the following: 100℃≤T≤170℃, 8Kgf / cm2≤F≤16Kgf / cm2, and 20s≤t≤150s.

[0052] The transfer temperature T can be set to 110℃, 135℃, or 160℃; the transfer pressure F can be set to 9 kgf / cm², 12 kgf / cm², or 15 kgf / cm²; and the transfer time t can be set to 30 s, 85 s, or 160 s. In other words, the transfer temperature, pressure, and time can be flexibly set according to actual conditions to improve the transfer quality of the membrane electrode assembly.

[0053] In the specific execution process, in Example 1, the dimensions of the first catalyst transfer film 2 and the second catalyst transfer film 4 can be set to 4cm*5cm, and the dimensions of the electrolyte membrane 3 can be 5cm*6cm. The protective layer of the electrolyte membrane 3 is peeled off to generate the electrolyte membrane 3. The electrolyte membrane 3 is placed on sulfuric acid paper and flattened, and then transferred to the first catalyst transfer film 2. The sulfuric acid paper is peeled off, and the second catalyst transfer film 4 and the second protective film 5 are stacked in sequence to construct the prefabricated membrane electrode assembly 100. Further, the prefabricated membrane electrode assembly 100 is transferred using a hot press, wherein the transfer temperature is set to 140℃, the transfer pressure is set to 13Kgf / cm2, and the transfer time is set to 90s to complete the transfer. After the transfer is completed, the substrate films of the second protective film 5 and the second catalyst transfer film 4 are peeled off in sequence to peel off the electrolyte membrane 3 with catalyst layers on both sides, thereby obtaining the membrane electrode assembly.

[0054] In Example 2, the dimensions of the first catalyst transfer film 2 and the second catalyst transfer film 4 can be set to 4cm*5cm, and the dimensions of the electrolyte membrane 3 can be 5cm*6cm. The protective layer of the electrolyte membrane to be used is peeled off to generate the electrolyte membrane 3. The electrolyte membrane 3 is placed on weighing paper and flattened, and then transferred to the first catalyst transfer film 2. The weighing paper is peeled off, and the second catalyst transfer film 4 and the second protective film 5 are stacked in sequence to construct the prefabricated membrane electrode assembly 100. Further, the prefabricated membrane electrode assembly 100 is transferred using a hot press, wherein the transfer temperature is set to 140℃, the transfer pressure is set to 13Kgf / cm2, and the transfer time is set to 90s to complete the transfer. After the transfer is completed, the substrate films of the second protective film 5 and the second catalyst transfer film 4 are peeled off in sequence to peel off the electrolyte membrane 3 with catalyst layers on both sides, thereby obtaining the membrane electrode assembly.

[0055] In Example 3, the dimensions of the first catalyst transfer film 2 and the second catalyst transfer film 4 can be set to 120cm*200cm, and the dimensions of the electrolyte membrane 3 can be 126cm*206cm. The protective layer of the electrolyte membrane to be used is peeled off to generate the electrolyte membrane 3. The electrolyte membrane 3 is placed on weighing paper and flattened, and then transferred to the first catalyst transfer film 2. The weighing paper is peeled off, and the second catalyst transfer film 4 and the second protective film 5 are stacked in sequence to construct the prefabricated membrane electrode assembly 100. Further, the prefabricated membrane electrode assembly 100 is transferred using a hot press, wherein the transfer temperature is set to 140℃, the transfer pressure is set to 13Kgf / cm2, and the transfer time is set to 90s to complete the transfer. After the transfer is completed, the substrate films of the second protective film 5 and the second catalyst transfer film 4 are peeled off in sequence to peel off the electrolyte membrane 3 with catalyst layers on both sides, thereby obtaining the membrane electrode assembly.

[0056] In Example 4, the dimensions of the first catalyst transfer film 2 and the second catalyst transfer film 4 can be set to 120cm*200cm, and the dimensions of the electrolyte membrane 3 can be 126cm*206cm. The protective layer of the electrolyte membrane to be used is peeled off to generate the electrolyte membrane 3. The electrolyte membrane 3 is placed on sulfuric acid paper and flattened, and then transferred to the first catalyst transfer film 2. The sulfuric acid paper is peeled off, and the second catalyst transfer film 4 and the second protective film 5 are stacked in sequence to construct the prefabricated membrane electrode assembly 100. Further, the prefabricated membrane electrode assembly 100 is transferred using a hot press, wherein the transfer temperature is set to 140℃, the transfer pressure is set to 13Kgf / cm2, and the transfer time is set to 90s to complete the transfer. After the transfer is completed, the substrate films of the second protective film 5 and the second catalyst transfer film 4 are peeled off in sequence to peel off the electrolyte membrane 3 with catalyst layers on both sides, thereby obtaining the membrane electrode assembly.

[0057] As demonstrated by the multiple embodiments, the membrane electrode assemblies obtained in Embodiments 1 and 2 have smooth and defect-free surfaces, while the membrane electrode assemblies in Embodiments 3 and 4 exhibit complete transfer and uniform catalyst distribution. In other words, unfolding the electrolyte membrane 3 onto auxiliary paper and then mounting it flat onto the first catalyst transfer membrane 2 using the auxiliary paper effectively solves the problem of wrinkles and adhesion during membrane electrode assembly. This effect is particularly pronounced when the electrolyte membrane 3 is large, thus resolving the issue of incomplete catalyst layer transfer and resulting in a uniform and smooth catalyst layer in the membrane electrode assembly, thereby improving the performance of the membrane electrode assembly.

[0058] In some embodiments, such as Figure 2 As shown, the preparation of the first catalyst transfer film 2 includes:

[0059] S11: The substrate layer with the catalyst layer is stamped using a stamping machine to obtain the first catalyst transfer film 2. That is, after the catalyst is coated onto one side of the substrate layer to form the catalyst layer, the substrate layer with the catalyst layer is stamped into a regular shape using a stamping machine with dies of different sizes, such as... Figure 3 The square structure shown in the diagram forms the first catalyst transfer film 2, which can be adhered to the side of the electrolyte membrane 3 for transfer. It should be noted that both the second catalyst transfer film 4 and the electrolyte membrane 3 can be processed using a stamping machine to obtain the desired shape.

[0060] In some embodiments, the protective film is any one of a PI film, a PET film, and a PEN film. It is understood that the protective film, such as a PI film, a PET film, or a PEN film, can be selected based on the transfer conditions. This ensures good protection of the pre-fabricated membrane electrode assembly 100 and allows the protective film to remain stable during the transfer process, avoiding interference with the normal transfer process and improving the overall quality of the membrane electrode assembly. It should be noted that the selection of the protective film is not limited to the aforementioned film materials; any film material that remains stable and does not deform under the transfer temperature conditions can be used as a protective film.

[0061] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0062] In the description of this invention, "first feature" and "second feature" may include one or more of the features.

[0063] In the description of this invention, "a plurality of" means two or more.

[0064] In the description of this invention, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or it may include the first and second features not being in direct contact but being in contact through another feature between them.

[0065] In the description of this invention, the terms "above," "over," and "on top" for the first feature and the second feature include the first feature being directly above or diagonally above the second feature, or simply indicating that the first feature is at a higher horizontal level than the second feature.

[0066] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0067] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A method for preparing a membrane electrode assembly, characterized by, The preparation method comprises: preparing a first layer catalyst transfer film (2) and a second layer catalyst transfer film (4); placing the first layer catalyst transfer film (2) on one side of a first layer protective film (1); peeling off a protective layer of an electrolyte membrane to be used to form an electrolyte membrane (3), and placing the electrolyte membrane (3) on an auxiliary paper, placing a side of the electrolyte membrane (3) away from the auxiliary paper on a side of the first layer catalyst transfer film (2) away from the first layer protective film (1), so that the auxiliary paper assists the electrolyte membrane (3) to adhere to the first layer catalyst transfer film (2); peeling off the auxiliary paper from the electrolyte membrane (3); placing the second layer catalyst transfer film (4), a second layer protective film (5) on a side of the electrolyte membrane (3) away from the first layer catalyst transfer film (2) in sequence to form a pre-prepared membrane electrode assembly (100); obtaining a final membrane electrode assembly through the pre-prepared membrane electrode assembly (100); wherein after placing the electrolyte membrane (3) on the auxiliary paper, a flattening operation is performed to make the electrolyte membrane (3) adhere to the first layer catalyst transfer film (2).

2. The method for preparing a membrane-electrode assembly according to claim 1, characterized by, The auxiliary paper is any one of weighing paper, sulfuric acid paper, printing paper, and oil wax paper.

3. The method of claim 1, wherein the membrane electrode assembly is prepared by a process comprising: The size of the electrolyte membrane (3) is greater than or equal to the size of the first layer catalyst transfer film (2), and / or the size of the first layer catalyst transfer film (2) is the same as that of the second layer catalyst transfer film (4).

4. The method for preparing a membrane-electrode assembly according to claim 1, characterized by, The first layer catalyst transfer film (2) and the second layer catalyst transfer film (4) each comprise a substrate layer and a catalyst layer; wherein the substrate layer of the first layer catalyst transfer film (2) adheres to the first layer protective film (1) and the catalyst layer adheres to a first side of the electrolyte membrane (3), and the substrate layer of the second layer catalyst transfer film (4) adheres to the second layer protective film (5) and the catalyst layer adheres to a second side of the electrolyte membrane (3).

5. The method of claim 4, wherein the membrane electrode assembly is prepared by a process comprising: The substrate layer is any one of a fluorine film with PET as a substrate, a PTFE film, an e-PTFE film, and a PI film.

6. The method for producing a membrane-electrode assembly according to any one of claims 1 to 5, characterized by, The method for obtaining a final membrane electrode assembly through the pre-prepared membrane electrode assembly (100) comprises: setting a transfer condition; controlling a hot press to transfer the pre-prepared membrane electrode assembly (100) under the transfer condition; peeling off the pre-prepared membrane electrode assembly (100) after transfer to obtain a final membrane electrode assembly.

7. The method of claim 6, wherein the membrane electrode assembly is prepared by a process comprising: In the transfer condition, the transfer temperature is T, the transfer pressure is F, and the transfer time is t, which satisfy: 100℃≤T≤170℃, 8Kgf / cm2≤F≤16Kgf / cm2, and 20s≤t≤150s.

8. The method for producing a membrane-electrode assembly according to any one of claims 1 to 5, characterized by, The method for preparing a first layer catalyst transfer film (2) and a second layer catalyst transfer film (4) comprises: stamping a substrate layer with a catalyst layer using a stamping machine to obtain the first layer catalyst transfer film (2) and the second layer catalyst transfer film (4) respectively.

9. The method for producing a membrane-electrode assembly according to any one of claims 1 to 5, characterized by, The first layer catalyst transfer film (2) and / or the second layer protective film (5) is any one of a PI film, a PET film, and a PEN film.

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