Current Dry Electrode Process Categories
Current Dry Electrode Process Categories – Catalyst Coating Equipment – Cheersonic
Powder tableting method. As a powder molding method, powder tableting has been gradually applied to the energy storage field with the development of technology, especially the electrolyte and electrode of all-solid-state batteries. The rigid mold and unidirectional pressing used for powder tableting have the disadvantages of uneven stress and density distribution, resulting in low density and high porosity, and are not suitable for large-scale production.
Powder spraying method. The powder spraying method sprays the powder onto the current collector through a dry mixed powder application device, and then fixes the powder on the current collector by hot pressing. Powder spraying technology has been developed very maturely, but there are relatively few reports on its use in large-scale production of energy storage devices. Powder spraying production can adopt roll-to-roll production technology. Generally, the literature reports that this method generally uses PVDF binder, dry mixes the active material, conductive agent and binder, and then uses high-pressure gas spraying, electrostatic spraying and other processes to directly deposit the powder on the surface of the current collector, and then hot presses at a temperature close to the melting point of PVDF to melt the binder and wrap it on the surface of the active particles.
Binder fiberization method, the process steps include: (i) dry powder mixing (ii) binder fiberization (iii) from powder to thin coating molding (iv) thin coating and current collector composite. These steps do not require solvent. The dry electrode process is scalable and can adapt to the current lithium-ion battery chemical system and advanced new battery electrode materials. A large number of commercial negative electrode materials (such as silicon-based materials and lithium titanate (LTO)) and positive electrode materials (such as layered ternary NMC, NCA, LFP, sulfur) have proved the stability and universality of the dry electrode process. According to the molding method of the self-supporting film, the process can generally be divided into:
- Powder extrusion molding: The preliminary fiberized mixed powder is further sheared at high speed by a twin-screw extruder to fiberize the binder and prepare it into a self-supporting film, which is then composited with the current collector.
- Powder rolling molding: The fiberized mixed powder is fiberized by a multi-stage roller press. The shear force during the differential rolling process causes the binder to fiberize and prepare it into a self-supporting film, which is then composited with the current collector.
Hydrogen production by electrolysis of water is the most advantageous method for producing hydrogen. Utrasonic coating systems are ideal for spraying carbon-based catalyst inks onto electrolyte membranes used for hydrogen generation. This technology can improve the stability and conversion efficiency of the diaphragm in the electrolytic water hydrogen production device. Cheersonic has extensive expertise coating proton exchange membrane electrolyzers, creating uniform, effective coatings possible for electrolysis applications.
Cheersonic ultrasonic coating systems are used in a number of electrolysis coating applications. The high uniformity of catalyst layers and even dispersion of suspended particles results in very high efficiency electrolyzer coatings, either single or double sided.
About Cheersonic
Cheersonic is the leading developer and manufacturer of ultrasonic coating systems for applying precise, thin film coatings to protect, strengthen or smooth surfaces on parts and components for the microelectronics/electronics, alternative energy, medical and industrial markets, including specialized glass applications in construction and automotive.
Our coating solutions are environmentally-friendly, efficient and highly reliable, and enable dramatic reductions in overspray, savings in raw material, water and energy usage and provide improved process repeatability, transfer efficiency, high uniformity and reduced emissions.
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