Due to their high energy and power density, low weight and high cycle stability, lithium-ion batteries are becoming increasingly important in the field of electromobility and in the stationary storage of electrical energy. Current research aims to improve the electrical, ecological and economic properties of the cell. A key aspect is adhesives in battery production. During production, active materials, carbon black and graphite, which are responsible for electrochemical energy storage and transfer, are usually processed with a binder and a solvent and applied to the battery film as thin coatings. The binder currently used for the cathode is based on the halogen-containing polyvinylidene fluoride dissolved in N-methyl-2-pyrrolidone. The solvent has reproductive toxicity and is classified by the European Chemicals Agency as a substance of very high concern. For reasons of occupational safety and environmental protection, its use must therefore comply with very stringent requirements for electrode drying and recycling. Welding processes are often used to join the flat arresters and contact tabs from cell to cell. The use of conductive binders is intended to show within the scope of this project whether the use of adhesives as an alternative contacting technology makes sense.
The aim of the project is to improve the performance of the lithium-ion battery by using alternative as well as electrically conductive adhesives as binder material and to establish the contacting of the foils by bonding as an alternative joining method. One challenge is to select the alternative binders and conductive polymers in such a way that the subsequent production steps in the process chain and the performance of the battery are not negatively affected. For this purpose, a requirement profile for an alternative binder is formulated and the selected adhesives are systematically investigated and evaluated in chemical, thermal and electrochemical tests. Based on the results, we process selected binder systems on a pre-industrial scale into electrode films and test them for their suitability.
AiF-Forschungsvereinigung „Otto von Guericke“ e.V.
Forschungskuratorium Maschinenbau e. V. - FKM
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