Meaning
The release of trapped volatile organic compounds from a solid material or liquid mixture happens during heating or under a vacuum. Managing solvent outgassing is a required step in the electrode drying process to prevent the formation of bubbles or surface defects. This phenomenon can also occur over a long period inside a sealed battery, leading to pressure build-up.
Drying Behavior
During the manufacture of battery electrodes, the slurry must be heated to remove the carrier liquid without damaging the binder. If solvent outgassing happens too quickly, the surface of the coating may skin over and trap gas underneath. This results in a porous and brittle layer that flakes off the current collector.
Controlling the temperature ramp is necessary to ensure a smooth and continuous film.
Vacuum Stability
Components used in high-vacuum environments are baked to remove residual liquids that would otherwise contaminate the chamber. The rate of solvent outgassing determines the time required to reach the target pressure for processes like physical vapor deposition. Measuring this rate helps in the selection of materials that are compatible with cleanroom standards.
Long-Term Storage
Residual solvents in a finished cell can slowly evaporate and contribute to the swelling of the casing. A low level of solvent outgassing is a sign of a well-controlled manufacturing process. This property is tracked during shelf-life testing to ensure the integrity of the product.
