Preparation method and application of ultra-high surface load organic electrode

Abstract

The invention belongs to the technical field of lithium ion batteries, and discloses a preparation method and application of an ultra-high surface load organic electrode. According to the organic electrode, sulfurized polyacrylonitrile is adopted as an active substance, the composite conductive agent and the composite binder are combined to construct the organic electrode coating, through the synergistic effect of multiple components and multiple processes, the organic electrode has the characteristics of good structural stability, excellent conductivity and high ion transmission efficiency, the rate capability and cycling stability of the lithium organic battery can be remarkably improved, and the service life of the lithium organic battery is prolonged. The effect is better than the prior art. The surface loading capacity of the active material of the organic electrode can reach 25mg. Cm <-2 >, so that the loading capacity limitation of the traditional organic electrode is greatly broken through, and the organic electrode is suitable for the requirements of high-energy-density lithium ion batteries such as soft package batteries and power batteries. The pole piece process can be adapted to a lithium metal battery with the energy density higher than 400Wh kg <-1 >, can meet the requirements of a high-magnification fast-charging power battery, effectively solves the key problems of insufficient structural stability, low surface load and the like of an organic electrode, and provides a customized solution for technical breakthrough and industrialization of a high-performance lithium battery.

Description

Technical Field

[0001] This invention belongs to the field of lithium-ion battery technology and relates to a method for preparing and applying an organic electrode with ultra-high surface load. Background Technology

[0002] The global energy structure is rapidly transitioning towards cleaner and lower-carbon energy sources. Electric vehicles, smart grids, and portable electronic devices are placing higher demands on the performance of lithium-ion batteries, with high energy density, fast charging capabilities, and long cycle life becoming core technological requirements. Currently, lithium-ion batteries primarily use inorganic materials such as lithium cobalt oxide and lithium iron phosphate as cathodes. While this technology has achieved industrial application, it has inherent limitations: firstly, it is highly dependent on key resources, with global reserves of rare elements such as cobalt limited (only about 7.1 million tons), making it difficult to support large-scale, long-term industry development; secondly, the manufacturing process is energy-intensive, requiring sintering temperatures exceeding 1600℃, which is inconsistent with the low-carbon development trend.

[0003] In contrast, organic cathode materials, with their unique molecular structure designability, wide availability of raw materials, and low-carbon preparation methods, can overcome the technological constraints of traditional inorganic cathodes, providing an innovative direction for developing sustainable, high-performance, and low-cost next-generation lithium metal batteries, and becoming a key area of ​​industry technology research and development. In cell manufacturing, one of the core technological paths to improve the energy density of a single cell is to increase the proportion of active material in the electrode sheet and increase the thickness of the electrode coating, while ensuring that the cell's safety performance is not compromised. This approach has been maturely applied in inorganic cathode material systems. However, compared to inorganic cathode materials, organic cathode materials have two major technological shortcomings that restrict their industrialization: firstly, the tap density of organic cathode materials is only about 0.5 g·cm³. -3 Furthermore, the intrinsic conductivity is low, resulting in insufficient internal structural stability when using this type of material to prepare organic electrodes. Delamination and microcracks easily occur during the preparation process and subsequent charge-discharge cycles, severely affecting the electrode's service reliability and cycle life. Secondly, the areal loading of organic cathode materials is typically below 5 mg·cm³. -2 This performance bottleneck directly limits its practical application in high-energy-density battery cells.

[0004] The aforementioned technical challenges make it difficult for organic cathode materials to meet the core requirements of current battery cells for high energy density and long-term stable operation. Therefore, developing specialized electrode fabrication processes adapted to organic cathode materials is crucial for overcoming existing technological bottlenecks and promoting the industrial application of organic cathode materials. Sulphurized polyacrylonitrile (SPAN), as a highly promising organic cathode material, possesses outstanding advantages such as excellent structural stability and controllable electrochemical performance. Developing high-performance, ultra-high surface-load organic electrodes based on this material can effectively solve the core technical challenges of organic cathode materials in thick electrode fabrication and application. This has significant practical implications for promoting the technological advancement and industrialization of high-energy-density lithium-ion batteries and possesses broad market application prospects. Summary of the Invention

[0005] To overcome the shortcomings of the prior art, the present invention provides a method for preparing and applying an organic electrode with ultra-high surface load, which addresses the problems of limited energy density in existing lithium organic battery electrodes due to low active material loading, as well as the problems of conduction obstruction, structural collapse, and cycle decay that organic electrodes are prone to during cycling.

[0006] To achieve this objective, the present invention adopts the following technical solution: The first aspect of this invention provides an organic electrode with ultra-high surface load capacity, comprising a current collector and an active coating, wherein the active coating comprises vulcanized polyacrylonitrile, a composite conductive agent, and a composite binder. The composite conductive agent includes at least three of the following: Super P, Ketjen Black, acetylene black, aqueous dispersion of carbon nanotubes, and aqueous dispersion of graphene. The composite adhesive includes adhesive A and adhesive B. Adhesive A includes at least one of sodium alginate, sodium carboxymethyl cellulose, polyacrylic acid, and acrylonitrile copolymer. Adhesive B includes at least one of polytetrafluoroethylene, guar gum, and styrene-butadiene rubber.

[0007] Preferably, the current collector is one of rolled aluminum foil, electrolytic aluminum foil, carbon-coated aluminum foil, multilayer composite aluminum foil, aluminum mesh current collector, and foamed aluminum current collector. More preferably, the current collector is carbon-coated aluminum foil.

[0008] Preferably, the active coating of the present invention can be applied to one side or both sides of the current collector.

[0009] Preferably, the mass ratio of the vulcanized polyacrylonitrile, the composite conductive agent, and the composite binder is 80-92:3-10:5-10.

[0010] Preferably, the composite conductive agent comprises acetylene black, an aqueous dispersion of carbon nanotubes, and an aqueous dispersion of graphene in a mass ratio of 3-5:2-4:1-3.

[0011] Preferably, the adhesive A is sodium alginate and polyacrylic acid, and the adhesive B is guar gum.

[0012] More preferably, the mass ratio of sodium alginate, polyacrylic acid, and guar gum is 2-6:0.5-2:0.5-2.

[0013] Preferably, the thickness of the organic electrode is 50-300 μm.

[0014] A second aspect of the present invention provides a method for preparing an organic electrode with ultra-high surface load, comprising: The active slurry is prepared by wet mixing: the composite binder and solvent are mixed to obtain a binder solution, the composite conductive agent and vulcanized polyacrylonitrile are then mixed to obtain a mixed slurry, and finally the mixed slurry, binder solution and solvent are mixed to obtain the active slurry; the solvent is water.

[0015] The active slurry is coated onto the surface of the current collector at a coating speed of 5-20 m / min, and then dried at a temperature of 80-120°C with a wind frequency of 10-100 Hz to obtain the organic electrode.

[0016] A third aspect of the present invention provides a lithium metal battery, comprising the above-described organic electrode and electrolyte.

[0017] The fourth aspect of the present invention provides the application of the organic electrode in the preparation of lithium metal batteries.

[0018] The existing organic electrodes have low active material loading (<5 mg·cm³). -2 In addition, organic electrodes are prone to problems such as conduction obstruction, structural collapse, and cycle decay during cycling. This invention improves the energy storage capacity of lithium metal batteries, as well as the structural stability and cycle stability of batteries, by preparing organic electrode coatings using sulfurized polyacrylonitrile, composite conductive agents, and composite binders.

[0019] The composite conductive agent comprises a three-dimensional conductive network consisting of acetylene black, carbon nanotubes, and graphene. Acetylene black acts as point-like conductive sites, carbon nanotubes as one-dimensional long-range transport channels, and graphene as a two-dimensional conductive and supporting substrate. These three components synergistically fill the conductive blind spots of single carbon black, efficiently connecting the previously isolated SPAN particles, significantly reducing the electron transport resistance of the electrode, and solving the problem of poor intrinsic conductivity of SPAN materials. The layered structure of graphene and the high aspect ratio of carbon nanotubes enhance the support of the electrode framework, suppressing volume expansion and powdering during SPAN charging and discharging. Combined with the binder, this improves coating adhesion and extends electrode cycle life. In the composite binder, the ionic crosslinking properties of sodium alginate enhance the adhesion between the coating and the current collector, the high viscosity of polyacrylic acid inhibits the agglomeration of SPAN particles, and the hydrophilicity of guar gum improves the uniformity of slurry dispersion. The three work synergistically to ensure the stability of the electrode coating process and form a dense protective film on the surface of the SPAN particles, which inhibits the volume expansion of the electrode and the loss of active materials during charging and discharging. At the same time, it reduces the interfacial resistance when the electrolyte is wetted. In addition, its good hydrophilicity matches the wettability of the electrolyte, which helps to reduce the interfacial resistance between the electrode and the electrolyte.

[0020] Composite conductive agents ensure electrical conductivity and mechanical stability, while composite binders ensure structural integrity and interfacial compatibility. Working together, they optimize electrode reaction kinetics by reducing electron and ion transport resistance, thereby improving rate performance and capacity utilization efficiency. Furthermore, they suppress the volume effect of SPAN through a dual mechanism, significantly extending electrode cycle life and capacity retention.

[0021] Furthermore, by controlling the coating speed and drying conditions, the kinetics of water evaporation and the pore structure are matched and regulated, resulting in a uniform and suitable electrode pore distribution. This structure facilitates rapid electrolyte wetting and provides a buffer space for SPAN volume changes, further ensuring the structural integrity of the high-load electrode during long-term cycling.

[0022] In summary, this invention synergistically optimizes electrode composition and process, achieving structural stability of organic electrodes under ultra-high surface load, and providing a reliable technical path for the development of high energy density and long life lithium metal batteries.

[0023] The advantages and beneficial effects of this invention are: (1) Compared with traditional thin electrodes, the active material loading of the ultra-high surface loading organic electrode provided by the present invention can reach 25 mg·cm³. -2 This technology significantly breaks through the traditional organic electrode loading capacity bottleneck, adapts to the needs of high-energy-density lithium-ion batteries (such as pouch batteries and power batteries), solves the problem of "redundant battery volume caused by a large number of thin electrode stacking layers", and lays a solid foundation for improving the energy density of lithium metal batteries.

[0024] (2) The ultra-high surface load organic electrode prepared by this invention has significant advantages such as structural stability, good conductivity, and high ion transport efficiency, which effectively improves the rate performance and cycle stability of lithium organic batteries. Through the synergistic effect of multiple components and multiple processes, it successfully solves specific industry problems and the effect far exceeds that of existing technologies.

[0025] (3) The electrode processing technology provided by this invention is suitable for applications requiring an energy density >400 Wh kg. -1 This technology addresses the stringent requirements of lithium metal batteries and high-rate fast-charging power batteries. The core design principle is to precisely overcome the key technical challenges in the fabrication of organic cathode materials and organic electrodes under these specific scenarios, such as insufficient structural stability and low areal loading, providing customized solutions for performance breakthroughs and industrialization of high-end lithium battery products. Attached Figure Description

[0026] Figure 1 The electronic conductivity test results are for the SPAN organic electrode sheets described in Examples 1-9 and Comparative Examples 1-5.

[0027] Figure 2 The graphs show the rate performance of the SPAN organic electrode sheets described in Examples 1, 1, 2 and 5 under different surface loads.

[0028] Figure 3 The graphs show the cycling performance of the SPAN organic electrode sheets described in Examples 1, 1, 2 and 5 under different surface loads. Detailed Implementation

[0029] To enable those skilled in the art to better understand the technical solutions of this invention, the technical solutions of this invention will be clearly and completely described below in conjunction with the embodiments of this invention. Obviously, the described embodiments are only some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this invention.

[0030] Example 1 A method for preparing and applying an organic electrode with ultra-high surface cross-sectional area includes the following steps: 1.1 Pulping Operation Step 1: Stainless polyacrylonitrile (SPAN) is ball-milled and filtered through a 300-mesh sieve to collect the powder for later use; Step 2: Prepare a 10% aqueous solution of sodium alginate (SA), polyacrylic acid (PAA), and guar gum (GG); Step 3: Weigh the components according to the following ratio: SPAN: composite conductive agent (acetylene black: carbon nanotube aqueous dispersion: graphene aqueous dispersion = 5:3:2, wt%): composite binder (SA:PAA:GG = 6:2:2, wt%) = 90:5:5.

[0031] Step 4: Dry mix SPAN powder with acetylene black to obtain the first mixed dry material; Step 5: Mix, disperse and stir the first mixed dry material with the composite conductive agent (acetylene black: carbon nanotube aqueous dispersion: graphene aqueous dispersion = 5:3:2, wt%) to obtain the second mixed slurry.

[0032] Step 6: Add the composite binder and an appropriate amount of solvent (deionized water) to the second mixed slurry, and disperse and stir it under vacuum. After sieving, an electrode slurry with a solid content of 60% is obtained.

[0033] 1.2 Coating Operation An electrode slurry with a solid content of 60% was coated onto a carbon-coated aluminum foil with a coating thickness of 1500 μm and a coating speed of 10 m / min. The active slurry was then dried at 100°C with a wind frequency of 50 Hz to obtain a vulcanized polyacrylonitrile (SPAN) organic electrode.

[0034] 1.3 Battery Assembly Operation The above-mentioned SPAN organic electrode is rolled and cut to obtain a circular electrode sheet with a diameter of 10 mm, and then vulcanized polyacrylonitrile (SPAN) organic electrode is used. Electrolytes containing DEC:EC:FEC=9:9:2 Vol% were assembled into 2032 model button batteries in an argon glove box with a water and oxygen content of less than 0.01 ppm.

[0035] Example 2 This embodiment provides a method for preparing and applying an organic electrode with ultra-high surface load capacity, referring to Embodiment 1. The difference between this embodiment and Embodiment 1 is that a coating speed of 5 m / min is used instead of 10 m / min in Embodiment 1, while the remaining raw material ratios and preparation methods are strictly consistent with those in Embodiment 1.

[0036] Example 3 This embodiment provides a method for preparing and applying an organic electrode with ultra-high surface load capacity, referring to Embodiment 1. The difference from Embodiment 1 is that a coating speed of 20 m / min is used instead of 10 m / min in Embodiment 1, while the remaining raw material ratios and preparation methods are strictly consistent with Embodiment 1.

[0037] Example 4 This embodiment provides a method for preparing and applying an organic electrode with ultra-high surface cross-section, referring to Example 1. The difference from Example 1 is that a drying temperature of 90°C is used instead of 100°C in Example 1, while the remaining raw material ratios and preparation methods are strictly consistent with Example 1. Example 5 This embodiment provides a method for preparing and applying an organic electrode with ultra-high surface load capacity, referring to Embodiment 1. The difference from Embodiment 1 is that a drying temperature of 110 ℃ is used instead of 100 ℃ in Embodiment 1, while the remaining raw material ratios and preparation methods are strictly consistent with Embodiment 1.

[0038] Example 6 This embodiment provides a method for preparing and applying an ultra-high surface cross-section organic electrode, referring to Embodiment 1. The difference from Embodiment 1 is that a wind frequency of 10 Hz is used instead of 50 Hz in Embodiment 1, while the remaining raw material ratios and preparation methods are strictly consistent with Embodiment 1. Embodiment 7 This embodiment provides a method for preparing and applying an organic electrode with ultra-high surface load capacity, referring to Embodiment 1. The difference between this embodiment and Embodiment 1 is that a wind frequency of 100 Hz is used instead of 50 Hz in Embodiment 1, while the remaining raw material ratios and preparation methods are strictly consistent with Embodiment 1.

[0039] Example 8 This embodiment provides a method for preparing and applying an organic electrode with ultra-high surface load capacity, referring to Embodiment 1. The difference from Embodiment 1 is that the solid content of the final mixed slurry obtained during the slurry preparation process is 45%, while the proportions of other raw materials and the preparation method are strictly consistent with those in Embodiment 1.

[0040] Example 9 This embodiment provides a method for preparing and applying an organic electrode with ultra-high surface load capacity, referring to Embodiment 1. The difference from Embodiment 1 is that the solid content of the final mixed slurry obtained during the slurry preparation process is 75%, while the proportions of other raw materials and the preparation method are strictly consistent with those in Embodiment 1.

[0041] Comparative Example 1 This embodiment refers to Example 1 to provide a method for preparing and applying an organic electrode with ultra-high surface cross-section. The difference between this embodiment and Example 1 is that a single acetylene black is used instead of the composite conductive agent in Example 1 (acetylene black: carbon nanotube aqueous dispersion: graphene aqueous dispersion = 5:3:2, wt%). The remaining raw material ratios and preparation methods are strictly consistent with those in Example 1.

[0042] Comparative Example 2 This embodiment provides a method for preparing and applying an organic electrode with ultra-high surface cross-section, referring to Embodiment 1. The difference from Embodiment 1 is that a composite conductive agent (acetylene black: carbon nanotube aqueous dispersion = 7:3, wt%) is used instead of the composite conductive agent (acetylene black: carbon nanotube aqueous dispersion: graphene aqueous dispersion = 5:3:2, wt%) in Embodiment 1. The remaining raw material ratios and preparation methods are strictly consistent with those in Embodiment 1.

[0043] Comparative Example 3 This embodiment provides a method for preparing and applying an organic electrode with ultra-high surface load capacity, referring to Embodiment 1. The difference from Embodiment 1 is that sodium alginate is used instead of the composite binder in Embodiment 1 (sodium alginate: polyacrylic acid: guar gum = 6:2:2, wt%), while the proportions of other raw materials and the preparation method are strictly consistent with those in Embodiment 1.

[0044] Comparative Example 4 This embodiment provides a method for preparing and applying an organic electrode with ultra-high surface load capacity, referring to Embodiment 1. The difference from Embodiment 1 is that a composite binder (polyacrylic acid: guar gum = 1:1, wt%) is used instead of the composite binder (sodium alginate: polyacrylic acid: guar gum = 6:2:2, wt%) in Embodiment 1. The remaining raw material ratios and preparation methods are strictly consistent with those in Embodiment 1.

[0045] Comparative Example 5 This embodiment provides a method for preparing and applying an organic electrode with ultra-high surface load capacity, referring to Embodiment 1. The difference from Embodiment 1 is that an oil-based binder (PVDF) is used instead of the composite binder (sodium alginate, polyacrylic acid, and guar gum) in Embodiment 1, while the remaining raw material ratios and preparation methods are strictly consistent with Embodiment 1.

[0046] Performance testing Performance tests were performed on the sulfurized polyacrylonitrile organic electrodes prepared in Examples 1-9 and Comparative Examples 1-5, and the assembled lithium-ion batteries. Diaphragm resistance: The diaphragm resistance was recorded using an ACCFILM diaphragm resistance tester. The test results are shown in Table 1.

[0047] Electrode peel force test: The provided organic electrode was cut into dimensions of 61 mm wide and 75 mm long, and the electrode peel force was recorded. The test results are shown in Table 1.

[0048] Electrochemical performance testing: Constant current charge-discharge tests were conducted using the LANHE battery testing system. The voltage range for constant current charge-discharge tests was 1-3V. Cycle stability tests were conducted using a current density of 1C (two cycles of 0.1C activation). Rate performance tests were conducted using 0.5C, 1C, 3C, 5C, 8C, and 10C.

[0049] Table 1 Performance test results of the examples and comparative examples

[0050] Results analysis: (1) As shown in Table 1 and Figure 1 As shown, compared to Examples 2-9 and Comparative Examples 1-5, the organic electrode provided in Example 1 has the characteristics of high peel strength and low film resistance. That is, the organic electrode provided in Example 1 has a stable structure, good conductivity, and high ion transport efficiency. This results in a high peel strength for the organic electrode made using the composite binder (SA / PAA / GG) and composite conductive agent (acetylene black, carbon nanotubes, and graphene), ensuring a tight bond between the active coating and the current collector. Simultaneously, it effectively reduces the film resistance of the organic electrode, promoting efficient charge transport and thus improving the overall performance and stability of the battery. Furthermore, the improved coating process, through precise control of coating thickness uniformity and pore structure distribution, increases the stress nodes of the organic electrode, helping to maintain the stability of the electrode structure and effectively reducing electrode cracking and delamination, thereby improving the structural stability of the organic electrode during battery cycling.

[0051] (2) The surface loading of the active material in the organic electrode obtained in Example 1 was 25.3 mg·cm³. -2 This significantly improves the surface load capacity of existing organic electrodes. For example... Figure 2 and Figure 3 As shown, under this ultra-high load, the battery assembled with the electrode of Example 1 can operate normally at a high rate of 10C, and after 50 cycles at 1C, the capacity retention rate is close to 100%, which greatly balances the thick surface load and electrochemical performance, laying the foundation for the development of organic electrode materials.

[0052] (3) Comparing the conductive agents of Example 1 with those of Comparative Examples 1 and 2, the composite conductive agent used in Example 1 showed superior performance. The use of composite conductive agents can further improve the electronic conductivity of organic electrodes. First, the composite system forms a "three-dimensional conductive network": acetylene black provides point-like conductive sites, carbon nanotubes build one-dimensional electron transport channels, and graphene spreads a two-dimensional conductive substrate. The three work together to fill the conductive blind spots of single carbon black, significantly reducing the internal resistance of the electrode, improving the efficiency of electron and ion transport, and solving the problem of poor conductivity of SPAN itself. Second, the structural stability is better: the sheet structure of graphene and the high aspect ratio of carbon nanotubes can enhance the support of the electrode skeleton, suppress the volume expansion and powdering during the charging and discharging process of SPAN, and improve the adhesion of the coating with the action of the binder, thus extending the cycle life of the electrode. In contrast, single carbon black is difficult to form an effective structural support. Finally, the diverse morphologies of the composite conductive agent allow for more thorough contact with SPAN particles and binders, reducing interfacial impedance. Meanwhile, the high specific surface area of ​​graphene and carbon nanotubes can adsorb electrolyte, promote ion wetting, and further optimize electrode reaction kinetics, significantly improving electrode rate performance and capacity utilization efficiency compared to single carbon black.

[0053] (4) Comparing the binders of Example 1 with those of Comparative Examples 3 and 4, the composite binder used in Example 1 showed superior performance. The three components of the composite binder work synergistically: sodium alginate's ionic crosslinking properties enhance the adhesion between the coating and the current collector; polyacrylic acid's high viscosity inhibits SPAN particle agglomeration; and guar gum's hydrophilicity improves the uniformity of slurry dispersion. This solves the problems of easy detachment and insufficient dispersion of single components under high-activity material load, ensuring the stability of the coating process. In addition, the composite binder system can form a dense protective film on the surface of SPAN particles, inhibiting electrode volume expansion and active material loss during charging and discharging, while reducing interfacial resistance during electrolyte wetting. In contrast, the interfacial bonding force of a single binder is weak and cannot resist the volume deformation of SPAN, easily leading to interfacial failure during cycling. The multifunctional groups of the composite binder interact more gently with SPAN and conductive agents, avoiding interfacial side reactions that may be caused by a single binder. Furthermore, its hydrophilicity and electrolyte wettability are better matched, which can promote ion transport, improve electrode rate performance and capacity retention, and help the SPAN electrode to perform stable electrochemical performance.

[0054] (5) Comparing the oil-based binder of Example 1 with that of Comparative Example 5, the performance of the water-based binder used in Example 1 is superior. The surface of SPAN is rich in polar active sites such as hydroxyl groups and sulfur-oxygen bonds, while the oil-based core binder PVDF is an inert non-polar polymer with no active functional groups. It only binds to SPAN through weak physical adsorption and cannot form strong interactions such as hydrogen bonds and coordination bonds. This weak interfacial bonding is prone to generating voids, resulting in discontinuous electronic conduction pathways between the active material, conductive agent, and current collector. At the same time, it increases the resistance of lithium ions to cross the interface, ultimately manifesting as increased charge transfer impedance, insufficient capacity utilization, and poor rate performance.

[0055] (6) Comparing Example 1 with Examples 2-7, the drying process of the aqueous organic electrode requires the removal of a large amount of water (the moisture content of the wet film is usually >50%). The coating speed affects the water evaporation rate and pore structure by changing the residence time of the wet film in the drying chamber. The short residence time of the wet film in the drying chamber requires accelerating evaporation by increasing the drying temperature or wind speed. The diffusion rate of water from the inside of the wet film to the surface matches the evaporation rate, resulting in a uniform pore structure. This ensures rapid wetting of the electrolyte and reserves space for the volume expansion of the SPAN during charging and discharging.

[0056] (7) Comparing Example 1 with Examples 8-9, low solid content slurry is prone to causing the wet film to "sag" due to gravity (especially when the thickness of the organic electrode wet film is >200μm), resulting in thickening at the edges and thinning in the middle; high solid content slurry is prone to "stripes" and "unspread blank areas", and is difficult to disperse. It is easy to cause the conductive agent / SPAN to agglomerate due to insufficient shearing, forming local high resistance points.

[0057] The above description is merely a preferred embodiment of this application and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the invention involved in this application is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the inventive concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. An organic electrode with ultra-high surface load, comprising a current collector and an active coating, characterized in that, The active coating comprises vulcanized polyacrylonitrile, a composite conductive agent, and a composite binder. The composite conductive agent includes at least three of the following: Super P, Ketjen Black, acetylene black, aqueous dispersion of carbon nanotubes, and aqueous dispersion of graphene. The composite adhesive includes adhesive A and adhesive B. Adhesive A includes at least one of sodium alginate, sodium carboxymethyl cellulose, polyacrylic acid, and acrylonitrile copolymer. Adhesive B includes at least one of polytetrafluoroethylene, guar gum, and styrene-butadiene rubber.

2. The organic electrode with ultra-high surface cross-section according to claim 1, characterized in that, The current collector is one of the following: rolled aluminum foil, electrolytic aluminum foil, carbon-coated aluminum foil, multilayer composite aluminum foil, aluminum mesh current collector, and foamed aluminum current collector.

3. The organic electrode with ultra-high surface cross-section according to claim 1, characterized in that, The mass ratio of the vulcanized polyacrylonitrile, the composite conductive agent, and the composite binder is 80-92:3-10:5-10.

4. The organic electrode with ultra-high surface cross-section according to claim 1, characterized in that, The composite conductive agent comprises acetylene black, an aqueous dispersion of carbon nanotubes, and an aqueous dispersion of graphene in a mass ratio of 3-5:2-4:1-3.

5. The organic electrode with ultra-high surface cross-section according to claim 1, characterized in that, The adhesive A comprises sodium alginate and polyacrylic acid, and the adhesive B comprises guar gum.

6. The organic electrode with ultra-high surface cross-section according to claim 1, characterized in that, The mass ratio of sodium alginate, polyacrylic acid and guar gum is 2-6:0.5-2:0.5-2.

7. The organic electrode with ultra-high surface cross-section according to claim 1, characterized in that, The thickness of the organic electrode is 50-300 μm.

8. A method for preparing an organic electrode as described in any one of claims 1-7, characterized in that, include: (1) Preparation of active slurry by wet mixing method: The binder and solvent are mixed to obtain a binder solution, the conductive agent and vulcanized polyacrylonitrile are mixed to obtain a mixed slurry, and finally the mixed slurry, binder solution and solvent are mixed to obtain the active slurry; (2) Coating: The active slurry is coated on the surface of the current collector at a coating speed of 5-20 m / min, and then the active slurry is dried at a temperature of 80-120°C and a wind frequency of 10-100 Hz to obtain the organic electrode.

9. A lithium metal battery, characterized in that, Includes the organic electrode and electrolyte as described in any one of claims 1-7.

10. The use of an organic electrode as described in any one of claims 1-7 in the preparation of lithium metal batteries.

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