Lithium ion batteries store and supply electrical energy in mobile telephones, laptops and tools. Mobile applications, such as electric bicycles, electric scooters and other electric vehicles and hybrid concepts are also creating a steadily rising demand for batteries. The goal is to develop more powerful batteries that feature increased capacity, a longer lifetime, shorter charging times and lighter weight.
In addition to the mechanical and thermal resistance of the separators, the key factors for the quality and safety of the batteries are the chemical composition, the shape and particle size distribution of the active materials, the homogeneity and the absence of defects in the coatings on the conductor foils of the electrodes. Based on many years of experience, NETZSCH offers an extensive portfolio of machines and equipment for dry and wet grinding, mixing, homogenization, dispersion, delamination, separation and deaeration, as well as analysis.
Excellent performing Lithium-Ion-Batteries need well-dispersed electrically conductive material. The electron conductivity can be realized with carbon black and carbon black, conductive graphite mixtures. To reduce the content of inactive material within the coated electrode research on new materials e.g. Carbon Nano Tubes (CNT) is ongoing. These unique materials demand a soft disentangling/debundeling. An energy efficient processing route is the economic dispersionizer Omega®.
The market for Lithium-Ion-Batteries (LIB) is growing significantly. Therefore, cell producers demand scalable cost efficient processes. Planetary mixers are mature and often used as state-of-the-art. Due to limited mixer sizes, multiple planetary mixing systems are required to meet the slurry demand in large factories. Especially Gigafactories require alternative processes in order to reduce production cost of LIB cells.
The system HELIOS separates the individual mixing and dispersion steps within the slurry production. Raw materials are treated selectively and with adjusted energy input. The modular concept enables cell producers to react flexible on materials variations in each single step of the process, and consequently process times can be always optimized. Each process step is fully controllable to achieve reproducible product qualities. A case study for a 16 GWh line clearly shows the benefits of System Helios compared to the planetary mixing process. The system Helios reduces considerable investment and production costs by avoiding large number of planetary mixing lines.
One material of interest for battery production is pure metallic Silicone. The target median particle size for Silicone is in the range of 100 nm or even below.
In the webinar as an example, the grinding process of a metallic Silicone with a median particle size of app. 7 µm in a solvent based suspension with different grinding media sizes in different steps will be explained. In the webinar the machine technology, the grinding systems, the influence of different operating parameters as well as the advantage of grinding in steps with different grinding media sizes will be discussed in detail.
At the production of battery slurries it is important to achieve a deaerated, homogeneous product which is very well dispersed. Furthermore, it is important to keep temperature limits and have a reproducible product quality.
With the NETZSCH Planetary Mixers PMH we achieve a batch process, which sets the benchmark for dispersing quality, handling and process time. Not only the planetary mixer itself but also the peripheral equipment for raw material adding is designed to the needs of producing battery slurries. In this webinar we show you the advantages of our technology.