Surface modified AEROXIDE® fumed alumina catches unwanted transition metal ions and extends battery lifetime
The Challenge
Transitions metals (TM) such as Manganese (Mn), Nickel (Ni) and Iron (Fe) are crucial elements in cathode active materials (CAM), such as NMC and LFP. But during the battery life, TM-ions leach out of the CAM, move through the electrolyte and the separator, settle and finally react with the anode surface. This leads to a decrease in battery lifetime.
LIB cell producers try to counteract TM leaching by using special additives in the liquid electrolyte. However, every additional additive in a LIB cell can potentially cause unwanted side reactions.
Evonik’s Smart Solutions
Evonik Smart Effects develops surface modified AEROXIDE® fumed alumina products for CAM and separator coating equipped with an additional function: catch transition metal ions.
- Surface modified AEROXIDE® Alu 130 as CAM coating catches TM-ions directly at the source.
- Surface modified VP Alu 45 as separator coating acts as a filter membrane and catches TM-ions on their way through the separator to the anode.
