Test Cell with Separated Electrodes (IMAGE) Technical University of Munich (TUM) Caption Michael Metzger, researcher at the Technical University of Munich (TUM), shows the core of his new battery test cell: A glass ceramic membrane, coated with aluminum and plastic, allows only lithium ions to pass through. It is impermeable to all other components of the electrolyte fluid, thus allowing to investigate anionic and cationic reactions in lithium-ion batteries separately. Credit Monika Weiner / TUM Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.