Zr- and Ce-doped Li 6 Y(BO 3 ) 3 electrolyte for all-solid-state lithium-ion battery

The ionic conductivity of Li Y(BO ) (LYBO) was enhanced by the substitution of tetravalent ions (Zr and Ce ) for Y sites through the formation of vacancies at the Li sites, an increase in compact densification, and an increase in the Li -ion conduction pathways in the LYBO phase. As a result, the ionic conductivity of Li Y Zr Ce (BO ) (ZC-LYBO) reached 1.7 × 10 S cm at 27 °C, which was about 5 orders of magnitude higher than that of undoped Li Y(BO ) . ZC-LYBO possessed a large electrochemical window and was thermally stable after cosintering with a LiNi Mn Co O (NMC) positive electrode. These characteristics facilitated good reversible capacities in all-solid-state batteries for both NMC positive electrodes and graphite negative electrodes a simple cosintering process.