Research toward viable, safe batteries overcomes high resistance, low capacity solid-state barriers

phys.org | 6/13/2018 | Staff
cobra662 (Posted by) Level 3
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Engineers at the University of Maryland have developed a means to overcome obstacles in the development of solid-state batteries, primarily high resistance and low capacity. Dr. Eric Wachsman, Director of the Maryland Energy Innovation Institute and William L. Crentz Centennial Chair in Energy Research, and his group have broken these barriers through the fabrication of a uniquely microstructured solid electrolyte architecture based on a doped Li7La3Zr2O12 (LLZ) ceramic Li-conductor. The paper describing this technique was recently published in Materials Today.

Dr. Eric Wachsman, lead researcher, noted, "There has been tremendous interest in solid-state batteries due to their inherent safety and potential for game changing increase in energy density by use of Li metal anodes. However, until this work the Li-cycling current densities were too low to achieve commercially viable charge and discharge rates. Now that this has been achieved the potential of solid-state batteries can finally be realized."

Trilayer - Structures - Process - Gaps - Grains

Trilayer structures were produced through a low-cost, easily scalable tapecasting process. Without any gaps between grains, the dense layer is free from structural defects, blocking dendritic lithium growth that could short circuit the cell and increasing mechanical strength. The porous-dense-porous LLZ...
(Excerpt) Read more at: phys.org
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