Brookfield Viscometer

The viscosity of a binder is one of its main properties, as it has a strong impact on the mixing and forming steps of the electrode production, and ultimately on the final electrode quality. The viscosity is a function of the temperature. Defining its value for given temperature levels is the basis to determine the optimum mixing and forming temperatures to obtain a constant green paste viscosity.

The measurement is conducted with the EXT-100 apparatus, where a given quantity of binder is first heated in an external oven and then placed into the viscosimeter at a regulated temperature level. A spindle turns in the molten sample while the torque on the spindle is used for the calculation of the viscosity in centipoise (cP). Several temperature levels, usually between 140°C and 180°C, are measured to determine the temperature at which a given viscosity level is reached.