Passivation of the Current Collector
- Homogeneous, dense and non-particulate characteristics
- Increased electrochemical stability
- Supports innovative electrode processing approaches
- Enables next generation cell concepts, such as high-voltage and all-solid state batteries
The use of alternative electrolyte systems is an important approach to circumvent existing challenges and to enable next-generation Li-ion cells. While most commonly used LiPF6-based electrolytes show a high compatibility with the aluminum foil as a current collector, the use of other promising electrolyte systems lead to a corrosive decomposition of aluminum substrates.
To demonstrate the passivating properties of XPRIME, cyclic voltammetry measurements of refined aluminum foil as a cathode current collector vs. lithium have been performed using state-of-the-art and LiTFSI-based electrolyte systems. In these cells, the current density correlates with the electrochemical reactions of aluminum foil and the electrolyte. While the chemical properties of LiTFSI in general predestine it for the use in Li-Ion-batteries, the oxidation of aluminum at upper voltages is still a problem. The results have been compared to measurements with blank aluminum and commercial primered foil.