What Are The Applications Of Ultrasonic Spraying System in Lithium Batteries？

1. Applications in Electrode Preparation

As the core component determining the energy density of lithium batteries, the uniformity, density, and consistency of the positive electrode coating directly impact the battery's capacity, cycle life, and safety. The application of ultrasonic spraying technology in this process primarily addresses issues such as uneven coating thickness, particle agglomeration, and material waste associated with traditional spraying (such as air spray and pressure spraying).

•Improving Coating Uniformity: This technology atomizes a slurry consisting of active materials (such as lithium cobalt oxide and graphite) mixed with a conductive agent and binder into micron-sized droplets of controllable size, which are then uniformly applied to the metal foil current collector. This helps avoid issues such as "edge effects" and coating cracking that can occur with traditional coating methods, thereby improving electrode thickness consistency.

•Achieving Ultra-Thin Coatings: Ultrasonic spraying can produce extremely thin coatings, which helps reduce battery internal resistance and improve ion conduction efficiency.

•Improving Material Utilization: Due to the reduced spatter during the spraying process, material utilization can reach over 90%, significantly reducing production costs.

2. Applications in Functionalized Separators

As the "safety barrier" of lithium batteries, separators must possess high-temperature resistance, high air permeability, and excellent ion conductivity. Ultrasonic spraying offers significant advantages in separator functionalization coatings (such as ceramic and polymer coatings):

•Ceramic Coating: Uniformly spraying a ceramic or polymer coating onto the surface of a PP/PE-based separator significantly enhances the separator's heat resistance (ceramic coatings can withstand temperatures exceeding 200°C), electrolyte wettability, and mechanical strength.

•Precise Control of Coating Structure: This technology enables precise control of the coating's porosity and pore size distribution, helping to balance ion conductivity with dendrite blocking capability.

•Improving Safety: Coating improvements can effectively suppress separator thermal shrinkage, prevent internal short circuits, and enhance battery safety.

3. Expanded Applications in Other Key Links

•Tab Protective Coating: Electrolyte-resistant polymer coatings (such as PVDF and PTFE) are sprayed onto the surface of tabs (aluminum and copper). Ultrasonic spraying creates a pinhole-free, highly dense coating, effectively preventing electrolyte corrosion during cycling and reducing the rate of internal resistance growth.

•Battery Case Anti-corrosion Coating: Ultrasonic spraying can create an ultra-thin anti-corrosion coating for prismatic and cylindrical battery cases (such as aluminum alloy and stainless steel). This coating maintains lightweight construction while improving salt spray, humidity, and heat resistance, thereby extending battery life.

 

4. Summary of the Core Advantages of Ultrasonic Spraying Technology in Lithium Battery Applications

•Excellent coating quality: Uniform atomized droplets, high coating thickness accuracy, and no pinholes or agglomerates improve battery performance consistency.

•High material utilization: No high-pressure airflow is used during the atomization process, increasing material utilization to 85%-95%, reducing battery manufacturing costs.

•Strong process compatibility: Compatible with a variety of slurries, including water-based and solvent-based slurries, and precisely controllable spraying parameters (frequency, flow rate, and distance) to meet the coating requirements of different battery components.

•Environmentally friendly: No high-pressure air is required, reducing solvent evaporation by 30%-50%, aligning with the low-carbon manufacturing trend in the lithium battery industry.