Cathode modification by Li2O–B2O3–SiO2 glass addition for all-solid-state battery creation

Cathode modification by Li2O–B2O3–SiO2 glass addition can be considered one of the ways to solve the problem of the increased interfacial resistance between solid electrolyte and solid cathode. The chemical and thermal stability of composite solid electrolyte based on Li7La3Zr2O12 in contact with LiCoO2 and glass additive was studied using XRD and DSC analysis. It was established that the interaction in the mixture studied begins at 670 °C. Therefore, 650 °C at 1 h was chosen as heat treatment conditions for (100-x)LiCoO2 + x 65Li2O·27B2O3·8SiO2 | solid electrolyte half-cells (x = 0–20 wt%). It was established that 5 wt% of glass addition is optimal to reduce the interfacial resistance. It can be concluded that Li2O–B2O3–SiO2 glass addition in LiCoO2 leads to the tight contact with composite electrolyte based on Li7La3Zr2O12 and the decrease in the interface resistance between the two solids.