Baterias
Aditivos Condutores e Suspensões de Baterias
The majority of active materials are oxides with limited electrical conductivity. That is why additives that reduce the required charging time of the battery are added to the battery slurries.
Aqui são usadas principalmente matérias-primas à base de carbono, como negro de fumo, grafite e nano tubos de carbono (CNT), que devem ser caracterizados pela maior proporção possível. Primeiro, os materiais devem ser cuidadosamente dispersos ou delaminados em estágios preliminares. Aqui, o tamanho das partículas primárias, as propriedades dos sólidos a granel e os requisitos de pureza geralmente apresentam desafios específicos, que a NETZSCH resolve com o Epsilon e o s-Jet®.
Battery Slurries
PMH planetary mixers have established themselves as state of the art for the production of so-called battery slurries. Via the planetary mixer's rotating tool system, the conductive carbon black agglomerates can be broken up or active materials can be dry processed in an intensive kneading phase.
However, depending on the material system used, the binder can also be dissolved first and very gently mixed after addition of the active materials. To prevent defects in the coating due to gas inclusions, the mixing process is typically carried out under a vacuum. This way, pockets of air that have entered via the raw materials can be removed from the product.
The key aspects for selection of the PMH planetary mixer are the excellent temperature control and the broad viscosity range for which this machine is suited.
