Lithium-ion Battery Electrode Preparation Technology
The rapid development of electric vehicles and new energy fields has put forward higher requirements on the energy density, life, safety and cost of batteries. It is urgent to develop lithium-ion batteries with high specific energy, long life, high safety and low cost. The two strategies commonly used to improve battery energy density (reduce cost) are:
- Develop new electrode materials with higher specific capacity, such as high-capacity silicon-based negative electrode materials and positive electrode materials;
- Construct advanced electrode structures with higher active material ratio and excellent electrochemical performance.
In terms of electrode structure construction, researchers have conducted research mainly from the following three aspects:
- Optimizing the porosity and pore size distribution of porous electrodes, that is, increasing the volume of mesopores and macropores without changing the proportion of active materials, can effectively improve the electrolyte wettability, improve the utilization rate of active materials, and reduce the uneven polarization inside the electrode. At the same time, for high-capacity electrodes with large volume effects such as silicon-based electrodes, uniform pore size distribution is conducive to relieving internal stress of the electrode, improving electrode stability, and thus improving battery cycle performance;
- Reducing electrode tortuosity by optimizing electrode formulation, pore structure, component morphology, preparation technology and other methods can improve the ion transfer rate in porous electrodes. The development of new electrode preparation technologies such as extrusion sintering, electrode slurry directional freezing and magnetic field controlled coating has accelerated the construction and application of high-load thick electrodes. Combined with the needs of porous electrode tortuosity design optimization, the research on electrode tortuosity test evaluation methods has also attracted the attention of scholars;
- Electrode longitudinal pore gradient design and component gradient design. Compared with uniform electrodes, gradient electrode design not only reduces the non-uniform polarization inside the electrode, but also relieves the internal stress of the electrode, and the cycle stability of the electrode is significantly improved. The design and construction of gradient electrodes accelerate the application of silicon-based materials in high-energy-density batteries.
Porous electrodes are the main place where the electrode process inside the battery occurs, and the electrode structure parameters are the key factors that determine the performance of the electrode and battery. The research on porous electrode structure design optimization and preparation technology is the focus of future research, which includes:
- Combining model simulation and modern measurement technology to establish a method for characterizing and verifying the characteristic parameters of porous electrode structure, and realize a clear description of the structural characteristics of porous electrodes;
- In-depth study of the intrinsic relationship between porous electrode structure characteristics and electrode and battery performance, clarify the structure-performance relationship of porous electrode structure and performance, and provide technical direction for porous electrode design optimization;
- Study the evolution law of porous electrode structure characteristics during cyclic use, explore battery structure failure mode and improvement strategy;
- Develop new preparation technology for porous structure controllable electrodes. At present, most of the new electrode preparation technologies are in the laboratory research stage. Accelerating experimental research and promoting the large-scale application of new preparation technologies are the key directions for the development of structure controllable electrode preparation technology in the future.
Ultrasonic coating systems are used to apply polyimide coatings to create separator layers in applications where a chemically inert protective coating is required. Polyimide coatings are an alternative to tape for complex geometries and small areas such as channels and holes, encapsulating hazardous materials and protecting lithium and other hazardous substances from harmful reactions or leaks. Polyimides are widely used as flexible encapsulation materials in batteries using radioactive or highly reactive elements, and they have good structural integrity.
Ultrasonic spraying technology for polyimide separator coating has the following advantages:
- Ultra-thin films with excellent porosity can be produced.
- The resulting coating is durable, mechanically stable, and stable in each layer.
- The nozzle has no moving parts that are prone to wear and has a long service life.
- It has ideal dielectric properties to meet a variety of electrical needs.
- Deep expertise in polyimide coatings and mature and reliable technology.
- Extensive experience and superb craftsmanship in microporous membrane coatings.
- The prepared film has extremely high uniformity, good repeatability and stable quality.
- The obtained high-temperature resistant coating can function normally in a temperature environment up to 400 degrees Celsius and has a wide range of applications.
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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