Polymers for energy storage

 

Development of methods for storage of electrical energy have become highly important in recent time. Among all variety of rechargeable batteries, ones based on lithium deserve particular attention. In fact, lithium is the lightest metal and has the highest oxidation potential among the metals that allows much higher energy density comparing, for example, to Ni-Cd rechargeable batteries. Currently, Li-ion batteries based on LiMn2O4 and LiCoO2 cathodes are practically used. These Li-ion batteries provide good cycling and very high columbic efficiency. On the other hand, they suffer from insufficient energy density. Li-S batteries are the emerging class of rechargeable batteries, which potentially can provide much higher energy density. Although the lithium-sulfur system operates at a comparably low average potential of 2.1V against Li+/Li, it shows a high theoretic specific energy of 2600 Wh/kg due to the extraordinary theoretical specific capacity of 1675 mAh/g of sulfur.

We are interested to develop new porous carbon materials, polymer electrolytes, separators for Li-S batteries. 

Selected publications

Choudhury, S.; Agrawal, M.*; Formanek, P.; Jehnichen, D.; Fischer, D.; Krause, B.; Albrecht, V.; Stamm, M.; Ionov, L.* Nanoporous cathodes for high-energy Li-S batteries from gyroid block copolymer templates ACS Nano, 2015, 9 (6), 6147–6157. DOI: 10.1021/acsnano.5b01406

Agrawal, M.*; Choudhury, S.; Gruber, K.; Simon, F.; Fischer, D.; Albrecht, V.; Göbel, M., Koller, S., Stamm, M; Ionov, L.* Porous carbon materials for Li-S batteries based on resorcinol-formaldehyde resin with inverse opal structure Journal of Power Sources 2014, 261(1), 363-370. doi:10.1016/j.jpowsour.2014.03.052

Müller, M.*; Choudhury, S.; Gruber, K.; Cruz, V.B.; Fuchsbichler, B.; Jacob, T.; Koller, S.; Stamm, M.; Ionov, L.; Beckhoff, B. Sulfur X-ray absorption fine structure in porous Li-S cathode films measured under argon atmospheric conditions Spectrochimica Acta Part B: Atomic Spectroscopy 2014, 94/95, 22-26. doi:10.1016/j.sab.2014.03.001