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Energy Storage Materials

Ferroelectric materials for capacitive energy storage

High performance energy storage devices are in very high demand in electric vehicles (EVs), where it is critical to store and deliver energy quickly. Ferroelectric materials have high capacitance and can deliver energy more quickly than conventional batteries, while batteries have higher energy density. Oxide thin films have an important role to play in both capacitors and solid state battery components An example of recent capacitive work is our development of a novel ferroelectric composition based on BaTiO3. We have used a new processing approach to demonstrate a very high performance ferroelectric material (Fig.1).


The material has a high dielectric breakdown strength, a flat capacitance from 100°C to 300°C, and high energy density, all of which are required for EVs (Cho SH, Yun C, Wang H, Jian J, Zhang W, Huang J, Wang X, Wang H, and MacManus-Driscoll JL, Strongly enhanced dielectric and energy storage properties in lead-free perovskite titanate thin films by alloying, accepted Nano Energy 2018). We continue to develop these exciting materials in thin film and bulk form. 

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Figure 1. Energy density versus electric field for new BaTiO3-based thin film material compared to standard literature systems and flat dielectric constant over wide temperature range.