Li/H exchange of LiLaZrO single and polycrystals investigated by quantitative LIBS depth profiling.

LiLaZrO (LLZO) garnets are highly attractive to be used as solid electrolyte in solid-state Li batteries. However, LLZO suffers from chemical interaction with air and humidity, causing Li/H exchange with detrimental implication on its performance, processing and scalability. To better understand the kinetics of the detrimental Li/H exchange and its dependence on microstructural features, accelerated Li/H exchange experiments were performed on single crystalline and polycrystalline LLZO, exposed for 80 minutes to 80 °C hot water.

Investigating the electrochemical stability of LiLaZrO solid electrolytes using field stress experiments.

Cubic LiLaZrO (LLZO) garnets are among the most promising solid electrolytes for solid-state batteries with the potential to exceed conventional battery concepts in terms of energy density and safety. The electrochemical stability of LLZO is crucial for its application, however, controversial reports in the literature show that it is still an unsettled matter. Here, we investigate the electrochemical stability of LLZO single crystals by applying electric field stress macro- and microscopic ionically blocking Au electrodes in ambient air.