Optimization Experiments (IMAGE) Technical University of Munich (TUM) Caption Dr. Jennifer Ludwig at the Technical University of Munich (TUM) with samples from the optimization experiments. Finally these experiments led to a high-voltage cathode material, which, compared to standard lithium iron phosphate, improves the energy density of lithium-ion batteries from about 600 to 800 watt hours per kilogram. Credit Andreas Battenberg / 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.