Energy storage battery drying principle

What is the drying process of lithium-ion battery electrodes?

The drying process of lithium-ion battery electrodes is one of the key processes for manufacturing electrodes with high surface homogeneity and is one of the most energy-consuming stages. The choice of the drying parameters has a significant impact on the electrode properties and the production efficiency.

How do you dry battery electrodes?

The starting point for drying battery electrodes on an industrial scale is a wet film of particulate solvent dispersions, which are applied to a current collector foil by slot-die coating. Conventional convective drying removes the solvent from the wet film and solidifies the layer as the drying time progresses (Figure 1 ).

Why do we need a long dryer section for Lib production?

Currently, the state-of-the-art convective drying process employed during solvent-based electrode production is a key reason for the high electrical energy consumption of the LIB production process and also requires long dryer sections with huge investment costs.

Why is the drying of electrodes important?

It is crucial to ensure that the electrodes are dried in a timely manner during this process, as the solvent may contain moisture and other impurities that may adversely affect the battery performance. Therefore, the drying of the electrodes plays a crucial role in the fabrication of intelligent electrodes .

How is drying rate regulated during the preheating and deceleration phase?

During the preheating phase, the drying rate is controlled by electrode heating and temperature rise. In the constant velocity phase, it is regulated by the heat transfer from the surface airflow, while in the deceleration phase, it is affected by the mass transfer from the electrodes.

What is the drying rate of electrodes at a high temperature?

Finally, electron microscopy experiments and electrode adhesion experiments have verified that the drying of the electrodes at a temperature of 363.15 K and an airflow speed of 2.3 m/s resulted in a relatively high drying rate and excellent electrode quality.