Solid-state battery electrode thin film and electrolyte thin film dry process preparation device
By using interlaced uniform array distribution feeding and laser irradiation heating methods in the dry process of solid-state battery electrode film and electrolyte film, the problems of large film thickness and low mechanical strength are solved, and the preparation of ultra-thin uniform film is achieved, which improves the energy storage density and fast charging and discharge performance of solid-state batteries.
Patent Information
- Application Number
- CN202420965333.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-07
- Publication Date
- 2025-04-22
- Estimated Expiration
- 2034-05-07
AI Technical Summary
The prior art is difficult to manufacture ultra-thin, uniform and dense solid-state battery electrode films and electrolyte films at low cost. The wet process has high solvent toxicity, high cost and affects the film density. The film formed by the dry process has a large thickness, low mechanical strength and is prone to agglomeration, making it difficult to improve the energy density of the solid-state battery.
The interlaced uniform array distribution feeding method is used to combine laser irradiation heating to allow the material to be calendered in a molten state. Residual stress is eliminated through multi-stage calendering and laser annealing, the density and firmness of the film layer are improved, the porosity is reduced, and the interface contact area is increased.
The preparation of ultra-thin uniform film is realized, the energy storage density and fast charging and discharge performance of the battery are improved, and the lithium ion transmission performance is enhanced.
Smart Images
Figure CN222785290U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a dry process preparation device for a solid-state battery electrode film and an electrolyte film, belonging to the technical field of solid-state battery manufacturing. Background Art
[0002] Solid-state batteries have outstanding advantages such as good safety, high energy density, short charging time, long battery life, strong cycle performance and good low-temperature performance, and have become the development direction of new energy vehicles, energy storage, consumer electronics and other fields. How to manufacture ultra-thin (<10μm), uniform and dense electrode films and solid electrolyte films at low cost to achieve high energy density of solid-state batteries is a current problem.
[0003] There are two main processes for preparing electrode films and electrolyte films for solid-state batteries: dry process and wet process. The wet process can prepare ultra-thin electrolyte films or electrode films, but the solvents used in the wet process are highly toxic and costly, and the residual solvents will reduce the compactness and uniformity of the solid electrolyte film, making it difficult to further improve the energy density of solid-state batteries. The dry process mixes solid electrolytes and binders and other materials and rolls them into films. It does not require drying, and the whole process does not involve solvents. The cost of manufacturing the film is low, but the solid electrolyte film or electrode film formed by the dry process is usually thicker, and the residual stress of the film layer after rolling is large and easy to agglomerate, resulting in reduced mechanical strength and poor uniformity, making it difficult to further improve the energy density of solid-state batteries. Summary of the invention
[0004] In order to solve the above problems, the utility model provides a dry process preparation device for solid-state battery electrode film and electrolyte film, adopts a staggered uniform array distribution feeding method to solve the feeding uniformity problem, adopts laser irradiation heating to make the material in a molten state for calendaring to achieve ultra-thin uniform film preparation, adopts laser annealing to eliminate the residual stress generated by calendaring, adopts multi-stage calendaring with gradient increasing pressure and precise control of laser heating temperature to eliminate electrolyte or electrode film dry mix agglomeration, improves the density and firmness of the film layer, reduces the porosity, thereby increasing the interface contact area, reducing the interface resistance, and improving the lithium ion transmission performance, thereby achieving the technical effect of high energy storage density and rapid charging and discharging.
[0005] As attached Figure 1 , Attachment Figure 2 and attached Figure 3 As shown, the utility model provides a dry method preparation device for solid-state battery electrode film and electrolyte film, which includes a mixing bin, a metering feeding module, a shaping roller, an upper pressing roller A, a lower pressing roller A, a laser module A, a laser module B, a hot calendering module, a film thickness meter and an annealing module;
[0006] The electrode or electrolyte material in the mixing silo is extruded through the metering feeding module, and the laser module A and the laser module B respectively irradiate and heat evenly to make the binder in the electrode or electrolyte material in a molten state, and at the same time, the modification of some materials in the electrode and the electrolyte is also achieved; then it is rolled into a film by the shaping roller, the upper pressing roller A and the lower pressing roller A, and then after three to seven levels of rolling by the hot rolling module, it becomes a negative electrode film or solid electrolyte film with a thickness of not more than 10μm, and a positive electrode film with a thickness of not more than 50μm, and the maximum deviation of the film thickness is not more than 1μm; the thickness and surface density of the electrode film or electrolyte film after rolling are monitored by a film thickness meter, and the thickness of the film layer is ensured to reach the set thickness by adjusting the pressure distribution and heating temperature of each level of rolling in the rolling module; the annealing module anneals the rolled electrode film or electrolyte film to eliminate the pores and residual stress inside the electrode film or electrolyte film during the rolling process;
[0007] The metering feeding module is composed of a twin-screw extruder and a distributed extrusion head, and the distributed extrusion head extrude two rows of 2n continuous rectangular strips of material that are evenly distributed in an array perpendicular to the moving direction;
[0008] The hot calendering module is composed of three to seven laser calendering modules, which use laser to uniformly irradiate and heat the electrode film or electrolyte film so that the temperature of the binder therein is slightly lower than the melting point. The calendering pressure increases step by step between 100T and 500T and can be precisely controlled according to the calendering effect.
[0009] The laser calendering module is composed of a laser module C, a tensioner, an upper pressure roller B and a lower pressure roller B. The tensioner provides stable tension to the electrode film or electrolyte film. The laser module C is used to uniformly irradiate and heat the electrode film or electrolyte film at the calendering contact portion between the upper pressure roller B and the lower pressure roller B, so that its temperature is slightly lower than the melting point of the binder in the electrode film or electrolyte film. The laser module A, the laser module B and the laser module C are composed of an infrared laser A, a beam homogenizer and an infrared temperature measurement module. The light beam output by the infrared laser A is shaped by the beam homogenizer and then outputs a square light spot with uniform light field distribution. A large rectangular heating light spot is obtained by splicing a plurality of square light spots, which irradiates and heats the material or film layer of the electrode or electrolyte. The heating temperature is measured by the infrared temperature measurement module. The infrared temperature measurement module and the infrared laser A form a closed-loop feedback control, thereby ensuring that the heating temperature is stable at the set temperature.
[0010] The tensioner is a three-roller tensioner consisting of two fixed rollers and one floating roller, which is used for tension closed-loop control to obtain stable tension;
[0011] The annealing module is composed of an infrared laser B and a beam homogenizer, and outputs a square light spot with uniform light field distribution. The residual stress generated during the rolling process is eliminated by annealing the electrode film or the electrolyte film, thereby increasing the interface contact area, reducing the interface resistance, and improving the lithium ion transmission performance, thereby achieving the technical effect of improving the battery storage energy density and fast charging and discharging; the wavelengths of the infrared laser A and the infrared laser B are between 0.8μm and 3μm, and are used as heating light sources; the film thickness meter is an X-ray measuring instrument, which is used to monitor the thickness and surface density of the electrode film or the electrolyte film;
[0012] The shaping roller, upper pressing roller A, lower pressing roller A, upper pressing roller B and lower pressing roller B are mirror rollers made of 60GrMo material, the roller surface is chrome-plated and polished, the hardness is HRC62, the finish is Ra0.01, the thermal deformation is not more than 0.01mm, the maximum pressure is not more than 500T and the pressure can be precisely controlled according to the calendering effect.
[0013] Beneficial effects: The utility model provides a dry process preparation device for solid-state battery electrode film and electrolyte film, which adopts twin-screw extrusion and staggered uniform array distribution feeding method to solve the problem of feeding uniformity, and adopts laser uniform irradiation heating method to make the electrode and electrolyte materials or films in a molten state for calendaring into films, and combines multi-stage gradient increasing pressure hot calendaring to eliminate electrolyte or electrode film dry mix agglomeration, improve film density and firmness, thereby preparing ultra-thin electrode film and electrolyte film, and also realizes the modification of some materials in the electrode or electrolyte; laser uniform irradiation is used to anneal the electrode film or electrolyte film to eliminate the residual stress generated in the process of calendaring the film, thereby increasing the interface contact area, reducing the interface resistance, and improving the lithium ion transmission performance, thereby achieving the technical effect of high energy storage density and rapid charging and discharging. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Figure 1 It is a schematic diagram of a dry process preparation device for solid-state battery electrode films and electrolyte films.
[0015] Figure 2 It is a schematic diagram of the laser calendering module.
[0016] Figure 3 It is a schematic diagram of the distributed feeding holes in the uniformly staggered array of the metering feeding module. DETAILED DESCRIPTION
[0017] Example 1: A dry process preparation device for solid-state battery electrode film and electrolyte film.
[0018] Taking polytetrafluoroethylene (PTFE) as the binder of electrode film or solid electrolyte film material as an example, a dry process preparation device for solid-state battery electrode film and electrolyte film is described.
[0019] As attached Figure 1 , Attachment Figure 2 and attached Figure 3 As shown, the utility model provides a dry method preparation device for solid-state battery electrode film and electrolyte film, which includes a mixing bin, a metering feeding module, a shaping roller, an upper pressing roller A, a lower pressing roller A, a laser module A, a laser module B, a hot calendering module, a film thickness meter and an annealing module; the electrode or electrolyte material in the mixing bin is extruded by the metering feeding module, heated to 340°C under uniform irradiation of the laser module A and the laser module B, and then calendered into a film by the shaping roller, the upper pressing roller A and the lower pressing roller A, and then calendered by the hot calendering module. After calendering, the module becomes a negative electrode film or electrolyte film with a thickness of 6μm, and a positive electrode film with a thickness of 30μm, and the maximum deviation of the film thickness is 0.5μm; the thickness and surface density of the electrode film or electrolyte film after calendering are monitored by a film thickness meter, and the thickness of the film layer reaches the set thickness by adjusting the pressure distribution and heating temperature of each level of calendering inside the calendering module; the annealing module anneals the calendered electrode film or electrolyte film to eliminate the pores and residual stress inside the electrode film or electrolyte film during the calendering process;
[0020] The metering feeding module is composed of a twin-screw extruder and a distributed extrusion head, and the distributed extrusion head extrude 20 continuous rectangular strips of material in two rows that are evenly distributed in an array perpendicular to the moving direction;
[0021] The hot calendering module is composed of three to seven laser calendering modules, and the electrode film or electrolyte film is uniformly irradiated by laser to heat it to a temperature of 320°C. The calendering pressure is gradually increased between 300T and 500T and can be accurately controlled according to the calendering effect; the hot calendering module for preparing the negative electrode film or electrolyte film contains five laser calendering modules, and the hot calendering module for preparing the positive electrode film contains three laser calendering modules;
[0022] The laser calendering module is composed of a laser module C, a tensioner, an upper pressing roller B and a lower pressing roller B; the tensioner provides a stable tension to the electrode film or the electrolyte film, and the laser module C is used to uniformly irradiate and heat the electrode film or the electrolyte film at the calendering contact part between the upper pressing roller B and the lower pressing roller B, so that the temperature is 320°C;
[0023] The laser module A, laser module B and laser module C are composed of an infrared laser A, a beam homogenizer and an infrared temperature measurement module; the light beam output by the infrared laser A is homogenized by the beam homogenizer to output a square light spot with uniform light field distribution, and a large rectangular heating light spot is obtained by splicing a plurality of square light spots, which irradiates and heats the material or film layer of the electrode or electrolyte, and the heating temperature is measured by the infrared temperature measurement module, and the infrared temperature measurement module and the infrared laser A form a closed-loop feedback control, thereby ensuring that the heating temperature is stable at the set temperature;
[0024] The tensioner is a three-roller tensioner consisting of two fixed rollers and one floating roller, which is used for tension closed-loop control to obtain stable tension;
[0025] The annealing module is composed of an infrared laser B and a beam homogenizer, and outputs a square light spot with uniform light field distribution. The residual stress generated in the calendering process is eliminated by annealing the electrode film or the electrolyte film, so as to achieve the technical effect of improving the battery storage energy density and fast charging and discharging. The annealing temperature is 280°C. The wavelength of the infrared laser A and the infrared laser B is 976nm, and they are used as heating light sources.
[0026] The film thickness meter is an X-ray measuring instrument used to monitor the thickness and surface density of the electrode film and electrolyte film;
[0027] The shaping roller, upper pressing roller A, lower pressing roller A, upper pressing roller B and lower pressing roller B are mirror rollers made of 60GrMo material, the roller surface is chrome-plated and polished, the hardness is HRC62, the finish is Ra0.01, the thermal deformation is not more than 0.01mm, the maximum pressure is not more than 500T and the pressure can be precisely controlled according to the calendering effect.
[0028] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the utility model.
Claims
1. A dry process preparation device for solid-state battery electrode film and electrolyte film, characterized in that The device comprises a mixing bin, a metering feeding module, a shaping roller, an upper pressing roller A, a lower pressing roller A, a laser module A, a laser module B, a hot calendering module, a film thickness meter and an annealing module; the electrode or electrolyte material in the mixing bin is extruded through the metering feeding module, and the laser module A and the laser module B respectively irradiate and heat evenly to make the binder in the electrode or electrolyte material in a molten state, and also realize the modification of some materials in the electrode and the electrolyte; then the material is calendered into a film by the shaping roller, the upper pressing roller A and the lower pressing roller A, and then calendered in three to seven stages by the hot calendering module. The thickness of the electrode film or electrolyte film is not more than 10 μm, and the thickness of the positive electrode film is not more than 50 μm. The maximum deviation of the thickness of the film is not more than 1 μm. The thickness and surface density of the electrode film or electrolyte film after calendering are monitored by a film thickness meter. The thickness of the film layer reaches the set thickness by adjusting the pressure distribution and heating temperature of each level of calendering in the calendering module. The annealing module anneals the electrode film or electrolyte film after calendering to eliminate the pores and residual stress inside the electrode film or electrolyte film during the calendering process. The metering feeding module is composed of a twin-screw extruder and a distributed extrusion head, and the distributed extrusion head extrude two rows of 2n continuous rectangular strips of material that are evenly distributed in an array perpendicular to the moving direction; The hot calendering module is composed of three to seven laser calendering modules, which use laser to uniformly irradiate and heat the electrode film or electrolyte film so that the temperature of the binder therein is slightly lower than the melting point. The calendering pressure increases step by step between 100T and 500T and can be precisely controlled according to the calendering effect. The laser calendering module is composed of a laser module C, a tensioner, an upper pressure roller B and a lower pressure roller B. The tensioner provides stable tension to the electrode film or electrolyte film. The laser module C is used to uniformly irradiate and heat the electrode film or electrolyte film at the calendering contact portion between the upper pressure roller B and the lower pressure roller B, so that its temperature is slightly lower than the melting point of the binder in the electrode film or electrolyte film. The laser module A, the laser module B and the laser module C are composed of an infrared laser A, a beam homogenizer and an infrared temperature measurement module. The light beam output by the infrared laser A is shaped by the beam homogenizer and then outputs a square light spot with uniform light field distribution. A large rectangular heating light spot is obtained by splicing a plurality of square light spots, which irradiates and heats the material or film layer of the electrode or electrolyte. The heating temperature is measured by the infrared temperature measurement module. The infrared temperature measurement module and the infrared laser A form a closed-loop feedback control, thereby ensuring that the heating temperature is stable at the set temperature. The tensioner is a three-roller tensioner consisting of two fixed rollers and one floating roller; The annealing module is composed of an infrared laser B and a beam homogenizer, and outputs a square light spot with uniform light field distribution. The residual stress generated during the calendering process is eliminated by annealing the electrode film or the electrolyte film, thereby increasing the interface contact area, reducing the interface resistance, and improving the lithium ion transmission performance, thereby achieving the technical effect of improving the battery storage energy density and fast charging and discharging; the wavelengths of the infrared laser A and the infrared laser B are between 0.8μm and 3μm; The film thickness meter is an X-ray measuring instrument; The shaping roller, upper pressing roller A, lower pressing roller A, upper pressing roller B and lower pressing roller B are mirror rollers made of 60GrMo material, the roller surface is chrome-plated and polished, the hardness is HRC62, the finish is Ra0.01, the thermal deformation is not more than 0.01mm, the maximum pressure is not more than 500T and the pressure can be precisely controlled according to the calendering effect.
2. A solid-state battery electrode film and electrolyte film dry process preparation device as claimed in claim 1, characterized in that The twin-screw extruder and staggered uniform array distribution feeding method are adopted to achieve the technical effect of uniform feeding.
3. A solid-state battery electrode film and electrolyte film dry process preparation device as claimed in claim 1, characterized in that Laser uniform irradiation heating is used to make the electrode or electrolyte material in a molten state for calendering to obtain a film, thereby achieving the technical effect of eliminating dry-mixed agglomeration of the electrolyte or electrode film, and also realizing the modification of some materials in the electrode and electrolyte.
4. A solid-state battery electrode film and electrolyte film dry process preparation device as claimed in claim 1, characterized in that The pressure of multi-stage calendering is increased step by step and is precisely controlled according to the calendering effect. The heating temperature of the multi-stage calendering is slightly lower than the melting point of the binder in the film.