Electrical and ionic conductivity of Li2O-B2O3-Al2O3 glass electrolyte for solid-state batteries

Abstract

Solid-state electrolyte is a key component for all-solid-state lithium-ion batteries. The Li2O-B2O3-Al2O3 has been prepared, which is co-sinterable with electrode due to its low sintering temperature (520 °C). The as-prepared Li2O-B2O3-Al2O3 reveals glass transition temperature of 420 °C and crystallization temperature of 462 °C. The Li2O-B2O3-Al2O3 possess the reasonable electrochemical performances such as lithium-ion conductivity of 3.075 × 10−5 S/cm, activation energy of 0.72 eV, electronic conductivity of 4.102 × 10−5 S/cm. It is attributed to the particle morphology, grain-to-grain bonding and non-bridging oxygen. Our finding demonstrates that Li2O-B2O3-Al2O3 is an effective breakthrough in solid electrolyte for good electrochemical performances as well as excellent interfacial contact through co-sintering.