Lithium battery pole piece containing cross-linked hydrogenated nitrile rubber binder and preparation method of lithium battery pole piece

Abstract

The invention relates to the technical field of lithium battery manufacturing, in particular to a lithium battery pole piece containing a cross-linked hydrogenated nitrile rubber binder and a preparation method of the lithium battery pole piece. The invention relates to a preparation method of a lithium battery pole piece containing a cross-linked hydrogenated nitrile rubber binder. The preparation method comprises the following steps: S1, preparing positive electrode slurry; s2, coating a pole piece to form a primary pole piece; s3, first-stage calendering; s4, performing gamma ray radiation crosslinking; s5, secondary rolling is carried out; and S6, cutting: cutting the pole piece subjected to secondary calendering into a required size to obtain the lithium battery pole piece containing the cross-linked hydrogenated nitrile rubber binder. According to the lithium battery pole piece prepared by using the hydrogenated nitrile rubber buna as the binder and adopting the gamma ray radiation crosslinking technology, the strength, the flexibility and the electrochemical performance of the pole piece are remarkably improved, and meanwhile, the preparation method has the characteristics of environmental protection and high efficiency, and is suitable for large-scale production of the high-performance lithium battery pole piece.

Description

Technical Field

[0001] The present application relates to the technical field of lithium battery manufacturing, and in particular to a lithium battery pole piece containing a cross-linked hydrogenated nitrile rubber binder and a preparation method thereof. Background Art

[0002] Lithium-ion battery is a secondary battery (rechargeable battery) that mainly relies on the movement of lithium ions between the positive and negative electrodes to work. The positive electrode material of lithium battery is part of the material that constitutes the lithium-ion battery. It directly affects the performance of the lithium-ion battery and occupies a large proportion (the mass ratio of positive and negative electrode materials is 3:1-4:1). Usually, the positive electrode material needs to be formulated to contain active substances (such as LiCoO 2 、LiFePO 4 The mixture of alumina, dispersant, binder, conductive agent (such as carbon black), solvent, etc., is stirred, kneaded, and dispersed in a certain ratio and order to form a slurry, which is then coated on a current collector (such as aluminum foil) to form a positive electrode. The performance of the positive electrode of a lithium battery directly affects the overall performance of the battery, and the binder is one of the key materials in the preparation of the electrode. Traditional lithium battery positive electrode binders usually use polyvinylidene fluoride (PVDF), but it has problems such as insufficient flexibility and environmental unfriendliness. Hydrogenated nitrile rubber (HNBR) has excellent heat resistance, chemical resistance and mechanical properties, but when it is used as a binder, it is in an uncrosslinked state and has poor strength and toughness. Chinese invention patent CN 110183691A discloses that the use of peroxides, such as 1,3-bis (tert-butyl peroxyisopropyl) benzene, can greatly improve the mechanical properties of HNBR rubber. However, the chemicals such as peroxides that need to be added may react with the positive electrode material, resulting in reduced battery performance. Therefore, physical crosslinking of HNBR to improve the performance of the electrode may be an effective method. The application of HNBR in the battery field is of great significance. Summary of the invention

[0003] In view of the shortcomings of the prior art, the present application provides a lithium battery pole piece containing a cross-linked hydrogenated nitrile rubber binder and a preparation method thereof. The present application utilizes hydrogenated nitrile rubber as a binder and prepares the lithium battery pole piece through gamma ray radiation cross-linking technology, thereby significantly improving the strength, flexibility and electrochemical properties of the pole piece. At the same time, the preparation method of the present application is environmentally friendly and efficient, and is suitable for large-scale production of high-performance lithium battery pole pieces.

[0004] In a first aspect, the present application provides a method for preparing a lithium battery pole piece containing a cross-linked hydrogenated nitrile rubber binder, using the following technical solution: A method for preparing a lithium battery pole piece containing a cross-linked hydrogenated nitrile rubber binder comprises the following steps: S1. Prepare positive electrode slurry: mix the positive electrode active material, the conductive agent and the hydrogenated nitrile rubber binder in proportion, add a solvent, and use a planetary mixer to stir at a certain speed for 1 to 5 hours to form a uniform positive electrode slurry; S2. Coating the electrode sheet: evenly coat the positive electrode slurry on the aluminum foil current collector, control the coating thickness, and dry it at 80 to 120° C. to remove the solvent to form a primary electrode sheet; S3, primary calendering: the dried electrode is calendered by a calendering machine to make the electrode thickness uniform and improve the density; S4, gamma ray radiation cross-linking: placing the pole piece after primary calendering in a gamma ray radiation device, and performing gamma ray radiation cross-linking treatment to cause a cross-linking reaction of the hydrogenated nitrile rubber binder; S5, secondary calendering: the electrode after radiation cross-linking treatment is subjected to secondary calendering by a calendering machine; S6. Cutting: Cut the pole piece after the secondary calendering into a required size to obtain a lithium battery pole piece containing a cross-linked hydrogenated nitrile rubber binder.

[0005] By adopting the above technical scheme, S1: prepare positive electrode slurry, and form a uniform positive electrode slurry by mixing positive electrode active material, conductive agent, hydrogenated nitrile rubber binder and solvent. This step ensures that all components are evenly distributed, providing a good foundation for subsequent coating and calendering. It ensures the uniformity and consistency of materials in the subsequent coating process, which helps to improve the overall performance and consistency of the pole piece. S2: Coating the pole piece, evenly coating the positive electrode slurry on the aluminum foil current collector, and removing the solvent by drying. This step ensures the initial morphology and structure of the pole piece. The uniformity of coating directly affects the effect of subsequent calendering and cross-linking, and the drying process helps to reduce problems in subsequent processing. S3: Primary calendering, calendering makes the thickness of the pole piece uniform and improves the density. This helps to reduce defects in the pole piece and improve its electrochemical performance. The uniform thickness and density provide a good physical basis for subsequent gamma ray radiation cross-linking. S4: Gamma ray radiation cross-linking, gamma ray radiation cross-linking treatment is performed on the pole piece to cause the hydrogenated nitrile rubber binder to undergo a cross-linking reaction. This step significantly improves the mechanical strength and flexibility of the pole piece. The cross-linking reaction not only improves the physical properties of the pole piece, but also enhances the electrochemical properties of the pole piece, while providing a stable material basis for the subsequent secondary calendering. S5: Secondary calendering, the density and thickness uniformity of the pole piece are further improved through secondary calendering. This helps to further improve the overall performance of the pole piece. The secondary calendering ensures that the final performance of the pole piece meets the expected standards while reducing possible defects. S6: Cutting, cutting the calendered pole piece into the required size. This step ensures the consistency of the final product and facilitates subsequent assembly. The cutting process ensures the dimensional accuracy and consistency of the pole piece, which helps to improve the overall performance and reliability of the battery. Through the synergistic effect of the above steps, the preparation method of the present application not only improves the mechanical strength, flexibility and electrochemical properties of the lithium battery pole piece, but also ensures the environmental protection and efficiency of the production process. These advantages make this method suitable for large-scale production of high-performance lithium battery pole pieces.

[0006] Preferably, in step S1, the positive electrode active material is lithium iron phosphate (LiFePO 4 ) and lithium cobalt oxide (LiCoO 2 )

[0007] Preferably, in step S1, the weight proportion of the hydrogenated nitrile rubber binder in the positive electrode slurry is 2% to 10%, preferably 5%; the acrylonitrile content of the hydrogenated nitrile rubber is 33-50%, the number average molecular weight is 20,000 to 2 million, the degree of hydrogenation is greater than 95%, and the preferred degree of hydrogenation is greater than 99%.

[0008] By adopting the above technical scheme, hydrogenated nitrile rubber, as a polymer material, has good bonding properties and can effectively bond the positive electrode active material, conductive agent, etc. together to form a uniform positive electrode slurry. At the same time, it can also maintain the stability of the structure during the drying and calendering process of the pole piece to prevent the material from being delaminated or falling off. After the hydrogenated nitrile rubber binder is cross-linked by gamma ray radiation, the cross-linking density between its molecular chains increases, thereby improving the mechanical strength of the pole piece. This enhanced mechanical strength helps to reduce the cracking and shedding of the pole piece during the charging and discharging process. The hydrogenated nitrile rubber binder has good flexibility and ductility, so that the pole piece can adapt to volume changes during the charging and discharging process without being easily broken. This is crucial to improving the overall performance and service life of the battery. The use of hydrogenated nitrile rubber binder meets the requirements of green manufacturing and sustainable development. Its preferred acrylonitrile content and degree of hydrogenation ensure the environmental protection and safety of the material. During the preparation process, the weight proportion of the hydrogenated nitrile rubber binder is controlled between 2% and 10%, preferably 5%, which helps to balance the effect of the binder on the performance of the pole piece and cost-effectiveness. At the same time, choosing a hydrogenated nitrile rubber binder with an acrylonitrile content of 33-50%, a number average molecular weight of 20,000 to 2 million, and a hydrogenation degree greater than 95% can ensure that the comprehensive performance of the pole piece reaches the best state. In summary, the hydrogenated nitrile rubber binder plays a key role in the preparation of lithium battery pole pieces, which not only improves the mechanical strength and flexibility of the pole piece, but also improves its electrochemical performance, while meeting the requirements of environmental protection and sustainable development.

[0009] Preferably, in step S1, the solvent is N-methylpyrrolidone.

[0010] Preferably, in step S1, the conductive agent is at least one of superconducting carbon, acetylene black, carbon black, Ketjen black, carbon nanotubes and graphene.

[0011] Preferably, in step S1, the thickness of the aluminum foil current collector is 10 to 50 microns, preferably 15 to 25 microns.

[0012] Preferably, in step S2, the coating thickness is 10 to 200 microns, preferably 80 to 120 microns.

[0013] Preferably, in step S4, the gamma ray radiation cross-linking treatment has a radiation dose of 10 to 20 kGy. A lower radiation dose cannot cross-link the hydrogenated nitrile rubber, and a higher dose may cause the positive electrode material to decompose, affecting the battery performance.

[0014] By adopting the above technical scheme, gamma ray radiation can induce a cross-linking reaction of the molecular chains in the hydrogenated nitrile rubber binder. This cross-linking reaction can significantly improve the mechanical strength and flexibility of the material, while also improving its electrochemical properties. Through gamma ray radiation cross-linking treatment, the pole piece can show better stability during the charging and discharging process, reduce the cracking and shedding of the pole piece, thereby improving the overall performance and life of the battery. The radiation dose is controlled between 10 and 20 kGy. This dose range can not only ensure the effective cross-linking of the hydrogenated nitrile rubber binder, but also avoid excessive radiation decomposition of the positive electrode material, thereby ensuring that the battery performance is not affected. Gamma ray radiation cross-linking treatment is combined with other steps (such as primary calendering, secondary calendering, etc.) to act together in the preparation process of the pole piece. This synergistic effect can ensure that the uniformity, density and electrochemical performance of the pole piece are in the best state. Through primary calendering and secondary calendering treatment, the thickness of the pole piece can be made more uniform, which helps the uniformity of the pole piece after gamma ray radiation cross-linking treatment. Calendering can improve the density of the pole piece, which helps the stability and electrochemical performance of the pole piece after gamma-ray radiation cross-linking treatment. Gamma-ray radiation cross-linking treatment combined with other steps can improve the electrochemical properties of the pole piece, such as cycle life and energy density. In summary, gamma-ray radiation cross-linking treatment plays a key role in the preparation process of lithium battery pole pieces. Through the synergistic effect with other steps, it jointly improves the mechanical strength, flexibility, electrochemical properties of the pole piece and the overall battery performance.

[0015] Preferably, in steps S3 and S5, the calendering pressures of the primary calendering and the secondary calendering are both 10 to 50 MPa, preferably 20 to 30 MPa.

[0016] In a second aspect, the present application provides a lithium battery pole piece containing a cross-linked hydrogenated nitrile rubber binder, which adopts the following technical solution: As a general technical concept, the present application also provides the above-mentioned lithium battery pole piece containing cross-linked hydrogenated nitrile rubber binder, which is prepared by the above-mentioned preparation method of lithium battery pole piece containing cross-linked hydrogenated nitrile rubber binder and has a structure containing radiation cross-linked hydrogenated nitrile rubber binder.

[0017] In summary, the beneficial technical effects of this application are: 1. Improve mechanical strength: The mechanical strength of the pole piece is significantly improved by treating the hydrogenated nitrile rubber binder with gamma ray radiation cross-linking technology. This treatment method can effectively reduce the cracking and shedding of the pole piece during the charging and discharging process of the lithium battery, thereby improving the safety and reliability of the battery.

[0018] 2. Enhanced flexibility: The enhanced flexibility of the pole piece enables it to better adapt to the volume changes that occur during the charging and discharging process of the lithium battery. This improvement not only increases the service life of the battery, but also reduces the internal stress concentration problem caused by the deformation of the pole piece.

[0019] 3. Improved electrochemical performance: The electrochemical performance of the electrode after gamma ray radiation cross-linking treatment is also improved. Specifically, the cycle life and energy density of the battery are improved. This is of great significance to improving the overall performance of the battery and the user experience.

[0020] 4. Environmentally friendly materials and technologies: The hydrogenated nitrile rubber binder and gamma ray radiation cross-linking technology used in this application meet the requirements of environmental protection and sustainable development. This not only helps to reduce environmental pollution during the production process, but also reduces the consumption of resources, which is in line with the trend of green development of modern manufacturing industry. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following is a brief introduction to the drawings used in the embodiments: Figure 1 This is a flow chart for preparing a lithium battery pole piece containing a cross-linked hydrogenated nitrile rubber binder according to the present application; Figure 2 Schematic diagram of the structure of hydrogenated nitrile rubber before and after gamma-ray radiation cross-linking. DETAILED DESCRIPTION

[0022] The embodiments of the present application will be described in detail below in conjunction with the examples, but it will be appreciated by those skilled in the art that the following examples are only used to illustrate the present application and should not be considered as limiting the scope of the present application. In the examples, if specific conditions are not specified, they are carried out according to normal conditions or the conditions recommended by the manufacturer. If the manufacturer is not specified for the reagents or instruments used, they are all conventional products that can be purchased commercially.

[0023] In the following examples, the hydrogenated nitrile rubber has an acrylonitrile content of 42%, a number average molecular weight of 1.5 million, and a hydrogenation degree of 99.5%.

[0024] Example 1 A method for preparing a lithium battery pole piece containing a cross-linked hydrogenated nitrile rubber binder comprises the following steps: 920g of lithium iron phosphate (LiFePO 4), 60g carbon black and 20g hydrogenated nitrile rubber (HNBR) are mixed, 1000mL N-methylpyrrolidone (NMP) solvent is added, and a planetary mixer is used to stir at a speed of 2500rpm for 1 hour to form a uniform positive electrode slurry. The positive electrode slurry is evenly coated on an aluminum foil current collector with a thickness of 15 microns, the coating thickness is controlled to be 80 microns, and it is dried at 80°C for 14 hours to form a primary pole piece. The dried pole piece is subjected to primary calendering by a calendering machine with a calendering pressure of 20MPa. The pole piece after primary calendering is placed in a gamma ray radiation device and radiated cross-linked at a dose of 10kGy. The irradiated pole piece is subjected to secondary calendering by a calendering machine with a calendering pressure of 20MPa. The pole piece after secondary calendering is cut into the required size to obtain a lithium battery pole piece containing a cross-linked hydrogenated nitrile rubber binder.

[0025] Example 2 A method for preparing a lithium battery pole piece containing a cross-linked hydrogenated nitrile rubber binder comprises the following steps: 920g of lithium iron phosphate (LiFePO 4 ), 60g carbon black and 80g hydrogenated nitrile rubber (HNBR) were mixed, 1000mL N-methylpyrrolidone (NMP) solvent was added, and a planetary mixer was used to stir at a speed of 2000rpm for 5 hours to form a uniform positive electrode slurry. The positive electrode slurry was evenly coated on an aluminum foil current collector with a thickness of 25 microns, the coating thickness was controlled to be 120 microns, and it was dried at 120°C for 8 hours to form a primary electrode sheet. The dried electrode sheet was subjected to primary calendering by a calendering machine with a calendering pressure of 30MPa. The electrode sheet after primary calendering was placed in a gamma ray radiation device and radiated and cross-linked at a dose of 20kGy. The irradiated electrode sheet was subjected to secondary calendering by a calendering machine with a calendering pressure of 30MPa. The electrode sheet after secondary calendering was cut into the required size to obtain a lithium battery electrode sheet containing a cross-linked hydrogenated nitrile rubber binder.

[0026] Example 3 A method for preparing a lithium battery pole piece containing a cross-linked hydrogenated nitrile rubber binder comprises the following steps: 920g of lithium iron phosphate (LiFePO 4), 50g carbon black and 30g hydrogenated nitrile rubber (HNBR) are mixed, 1000mL N-methylpyrrolidone (NMP) solvent is added, and a planetary mixer is used to stir at a speed of 2000rpm for 2 hours to form a uniform positive electrode slurry. The positive electrode slurry is evenly coated on an aluminum foil current collector with a thickness of 20 microns, the coating thickness is controlled to be 100 microns, and it is dried at 100°C for 10 hours to form a primary pole piece. The dried pole piece is subjected to primary calendering by a calendering machine at a calendering pressure of 20MPa. The pole piece after primary calendering is placed in a gamma ray radiation device and radiated cross-linked at a dose of 15kGy. The irradiated pole piece is subjected to secondary calendering by a calendering machine at a calendering pressure of 25MPa. The pole piece after secondary calendering is cut into the required size to obtain a lithium battery pole piece containing a cross-linked hydrogenated nitrile rubber binder.

[0027] Example 4 900 g of lithium cobalt oxide (LiCoO 2 ), 50g carbon black and 50g hydrogenated nitrile rubber (HNBR) are mixed, 1000mL N-methylpyrrolidone (NMP) solvent is added, and a planetary mixer is used to stir at a speed of 2500rpm for 3 hours to form a uniform positive electrode slurry. The positive electrode slurry is evenly coated on an aluminum foil current collector with a thickness of 15 microns, the coating thickness is controlled to be 80 microns, and it is dried at 90°C for 12 hours to form a primary electrode sheet. The dried electrode sheet is subjected to primary calendering by a calendering machine at a calendering pressure of 15MPa. The electrode sheet after primary calendering is placed in a gamma ray radiation device and radiated cross-linked at a dose of 10kGy. Secondary calendering: The irradiated electrode sheet is subjected to secondary calendering by a calendering machine at a calendering pressure of 20MPa. Cutting: The electrode sheet after secondary calendering is cut into the required size to obtain a lithium battery electrode sheet containing a cross-linked hydrogenated nitrile rubber binder.

[0028] Comparative Example 1 The same as Example 4, except that: the secondary calendering treatment is directly performed after the primary calendering, and no radiation cross-linking is performed.

[0029] Comparative Example 2 Same as Example 4, except that the radiation cross-linking dose is 40 kGy.

[0030] Comparative Example 3 The same as Example 4, except that an equal amount of PVDF type adhesive (adhesive 5130 produced by Solvay Corporation, USA) is used instead of hydrogenated nitrile rubber.

[0031] Performance testing Resistivity test method: Use a resistance meter model BER2500 to test the electrode resistivity and battery internal resistance.

[0032] The button cell assembly sequence is from bottom to top: negative electrode shell - spring - gasket - lithium sheet - electrolyte - diaphragm - electrolyte - electrode - positive electrode shell; PE porous polymer film is used as diaphragm; 1mol / LLiPF 6 The solution is an electrolyte; The button cells were charged and discharged 100 times at a constant current of 0.5 C in the voltage range of 2.8 V to 4.25 V at 25° C. Room temperature charge / discharge measurements were used to evaluate the capacity and charge / discharge efficiency.

[0033] Capacity retention rate [%]=[discharge capacity at the 100th cycle / discharge capacity at the 1st cycle]×100.

[0034] Tensile strength: Use a tensile testing machine to test the tensile strength of the electrode.

[0035] Bending times: Repeatedly bend the pole piece 180° and record the number of times without cracks or falling off.

[0036] Table 1 Test results Analyzing the data in Table 1, we can see that: 1) The lithium battery pole pieces containing cross-linked hydrogenated nitrile rubber binder prepared in Examples 1 to 4 are prepared by using hydrogenated nitrile rubber as a binder and by gamma ray radiation cross-linking technology, which significantly improves the strength, flexibility and electrochemical properties of the pole pieces.

[0037] 2) The performance comparison analysis of the lithium battery pole piece containing the cross-linked hydrogenated nitrile rubber binder prepared in combination with Example 4 and Comparative Examples 1-2 shows that gamma ray radiation can induce a cross-linking reaction of the molecular chains in the hydrogenated nitrile rubber binder. This cross-linking reaction can significantly improve the mechanical strength and flexibility of the material, while also improving its electrochemical properties. Through gamma ray radiation cross-linking treatment, the pole piece can show better stability during the charge and discharge process, reduce the cracking and falling off of the pole piece, thereby improving the overall performance and life of the battery. A lower radiation dose or no gamma ray radiation treatment cannot cross-link the hydrogenated nitrile rubber, and a higher dose may cause the positive electrode material to decompose, affecting the battery performance.

[0038] 3) The comparative analysis of the performance of lithium battery pole pieces containing cross-linked hydrogenated nitrile rubber binder prepared in combination with Example 4 and Comparative Example 3 shows that the lithium battery pole pieces prepared by using hydrogenated nitrile rubber as a binder and through gamma-ray radiation cross-linking technology are significantly superior to traditional PVDF binder pole pieces in terms of strength, flexibility and electrochemical performance, and have broad application prospects.

[0039] The above embodiments are only used to explain the technical solutions of the present application rather than to limit them. Although the above embodiments provide a specific description of the present application, relevant technical personnel should understand that the specific implementation methods of the present application can still be modified or replaced by equivalents, and any modifications and equivalent replacements that do not depart from the spirit and scope of the present application should be included in the protection scope of the present application.

Claims

1. A method for preparing a lithium battery pole piece containing a cross-linked hydrogenated nitrile rubber binder, characterized in that: The following steps are involved: S1. Prepare positive electrode slurry: mix the positive electrode active material, the conductive agent and the hydrogenated nitrile rubber binder in proportion, add a solvent, and use a planetary mixer to stir at a certain speed for 1 to 5 hours to form a uniform positive electrode slurry; S2. Coating the electrode sheet: evenly coat the positive electrode slurry on the aluminum foil current collector, control the coating thickness, and dry it at 80 to 120° C. to remove the solvent to form a primary electrode sheet; S3, primary calendering: the dried electrode is calendered by a calendering machine to make the electrode thickness uniform and improve the density; S4, gamma ray radiation cross-linking: placing the pole piece after primary calendering in a gamma ray radiation device, and performing gamma ray radiation cross-linking treatment to cause a cross-linking reaction of the hydrogenated nitrile rubber binder; S5, secondary calendering: the electrode after radiation cross-linking treatment is subjected to secondary calendering by a calendering machine; S6. Cutting: Cut the pole piece after the secondary calendering into a required size to obtain a lithium battery pole piece containing a cross-linked hydrogenated nitrile rubber binder.

2. The method for preparing a lithium battery pole piece containing a cross-linked hydrogenated nitrile rubber binder according to claim 1, characterized in that: In step S1 , the positive electrode active material is one of lithium iron phosphate (LiFePO 4 ) and lithium cobalt oxide (LiCoO 2 ).

3. The method for preparing a lithium battery pole piece containing a cross-linked hydrogenated nitrile rubber binder according to claim 1, characterized in that: In step S1, the weight proportion of the hydrogenated nitrile rubber binder in the positive electrode slurry is 2% to 10%; the acrylonitrile content of the hydrogenated nitrile rubber is 33-50%, the number average molecular weight is 20,000 to 2 million, and the degree of hydrogenation is greater than 95%.

4. The method for preparing a lithium battery pole piece containing a cross-linked hydrogenated nitrile rubber binder according to claim 1, characterized in that: In step S1, the solvent is N-methylpyrrolidone.

5. The method for preparing a lithium battery pole piece containing a cross-linked hydrogenated nitrile rubber binder according to claim 1, characterized in that: In step S1, the conductive agent is at least one of superconducting carbon, acetylene black, carbon black, Ketjen black, carbon nanotubes and graphene.

6. The method for preparing a lithium battery pole piece containing a cross-linked hydrogenated nitrile rubber binder according to claim 1, characterized in that: In step S1, the thickness of the aluminum foil current collector is 10 to 50 micrometers.

7. The method for preparing a lithium battery pole piece containing a cross-linked hydrogenated nitrile rubber binder according to claim 1, characterized in that: In step S2, the coating thickness is 10 to 200 micrometers.

8. The method for preparing a lithium battery pole piece containing a cross-linked hydrogenated nitrile rubber binder according to claim 1, characterized in that: In step S4, the gamma ray radiation cross-linking treatment has a radiation dose of 10 to 20 kGy.

9. The method for preparing a lithium battery pole piece containing a cross-linked hydrogenated nitrile rubber binder according to claim 1, characterized in that: In steps S3 and S5, the calendering pressures of the primary calendering and the secondary calendering are both 10 to 50 MPa.

10. A lithium battery pole piece containing a cross-linked hydrogenated nitrile rubber binder, characterized in that: The lithium battery pole piece containing a cross-linked hydrogenated nitrile rubber binder is prepared by the preparation method of a lithium battery pole piece containing a cross-linked hydrogenated nitrile rubber binder according to any one of claims 1 to 9, and has a structure containing a radiation-crosslinked hydrogenated nitrile rubber binder.

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