B2O3-added lithium aluminium germanium phosphate solid electrolyte for Li–O2 rechargeable batteries

Abstract

B₂O₃-added Li_1.5Al_0.5Ge_1.5(PO₄)₃ (LAGP) glass ceramics showing a room temperature ionic conductivity of 0.67 mS cm⁻¹ have been synthesized by using a melt-quenching method. The prepared glass ceramics are observed to be stable in tetraethylene glycol dimethyl ether containing lithium bis(trifluoromethane) sulfonamide. The augmented conductivity of the B₂O₃-added LAGP glass ceramic has improved the plateau potential during discharge. Furthermore, the B₂O₃-added LAGP glass ceramics are successfully employed as a solid electrolyte in a Li–O₂ battery to obtain a stable cycling lifetime of up to 15 cycles with the limited capacity protocol.