Stability investigations of composite solid electrolytes based on Li7La3Zr2O12 in contact with LiCoO2

Abstract LiCoO2 was synthesized by the sol-gel method. Using the proposed synthesis method, a cathode was obtained at the final annealing temperature of 700 °C with a grain size of 40–80 nm. The chemical reaction stability of composite solid electrolytes based on Li7La3Zr2O12 in contact with LiCoO2 was studied using differential scanning calorimetry, Raman spectroscopy, and X-ray diffraction. The composite solid electrolytes based on tetragonal and cubic modification of Li7La3Zr2O12 with the addition of Li2O-Y2O3-SiO2 glass are stable in contact with LiCoO2 over a wide temperature range (35–900 °C). Tetragonal Li7La3Zr2O12 solid electrolyte is stable in contact with the LiCoO2 cathode due to the introduction of a glassy additive. Therefore, the possibility and prospects of using composite solid electrolytes based on Li7La3Zr2O12 in lithium and lithium-ion power sources with LiCoO2 as a cathode are shown.