A group led by Dr. Maria Braga at the University of Porto (Portugal) reports in the RSC’s Journal of Material Chemistry A journal on the potential for a novel type of superionic glasses for use as a solid electrolyte in advanced Lithium batteries. The material—evolved from an antiperovskite structure—shows the highest ionic conductivity ever reported for the Li-ion (25 mS cm−1 at 25 °C).
Three types of next generation batteries are currently being envisaged among the international community: metal-air batteries, multivalent cation batteries and all-solid-state batteries. These battery designs require high-performance, safe and cost effective electrolytes that are compatible with optimized electrode materials. Solid electrolytes have not yet been extensively employed in commercial batteries as they suffer from poor ionic conduction at acceptable temperatures and insufficient stability with respect to lithium-metal.—Braga et al.
The glassy Li3-2xMxAO (in which M is a higher valent cation like Ca2+ or Mg2+ and A is a halide like Cl- or Br- or a mixture of halides) are inexpensive, light, recyclable, non-flammable and non-toxic.
They also present a wide electrochemical window (higher than 8 V) and thermal stability within the application range of temperatures.
M. H. Braga, J. A. Ferreira, V. Stockhausen, J. E. Oliveirad and A. El-Azabe (2014) “Novel Li3ClO based glasses with superionic properties for lithium batteries,” J. Mater. Chem. A doi: 10.1039/C3TA15087A
M. Helena Braga, Verena Stockhausen, Joana C.E. Oliveira and Jorge A. Ferreira (2013) “The Role of Defects in Li3ClO Solid Electrolyte: Calculations and Experiments” MRS Proceedings Volume 1526 doi: 10.1557/opl.2013.519