“Powdered active materials were processed without solvents by using a dry-film procedure at the Fraunhofer IWS to produce high-performance electrodes”, stated Dr. Holger Althues, head of the consortium and Department of Chemical Surface and Battery Technology at the Fraunhofer IWS.
The advantages of the Si anode technique were determined in safety tests carried out by the Fraunhofer ICT. Li-S cells have a performance edge over conventional energy storage media thanks to their high tolerance to overcharging and thermal stress. The researchers combined data- and model-based methods to determine the state of charge and state of aging of their prototypes.
To make LiS cells a viable proposition, they have to be fabricated at scale and at low cost. The Fraunhofer FEP was able to develop a roll-to-roll vacuum coating process for the deposition of silicon layers with a specialized micro-scale structure on both sides of a thin charge-collector film made of copper.
“The layers proved themselves to be suitable anode material for Li-S cells as well as for Li-ion cells. They possess considerable potential for increasing the volumetric energy density compared to conventional solutions”, explains Dr. Nicolas Schiller, director of the Flat and Flexible Products Division at the Fraunhofer FEP.
The results of the LiScell project will be presented in booths and conference talks at the 6th Fraunhofer Li-S Workshop during the industrial trade fair and workshop week on vacuum coating technology and plasma surface engineering.
Fraunhofer-Gesellschaft - www.liscell.fraunhofer.de