Modification strategies of Li7La3Zr2O12 ceramic electrolyte for high-performance solid-state batteries

Enormous research focusing on solid-state electrolyte promotes the development of solid-state batteries. Compared to lithium-ion batteries using liquid electrolyte, the solid-state batteries feature the high energy density and non-flammability, which accelerates the revolution in portable electronics and transportation. Garnet-type Li7La3Zr2O12 (LLZO) solid-state electrolyte is considered as the promising solid-state electrolyte due to high ionic conductivity, Li transference number and shear modulus. However, surface contaminant and poor contact with lithium inhibit its practical application in lithium metal batteries. The review provides a brief introduction about structure and properties of LLZO. Then, we conclude the modification strategies for increasing ionic conductivity, enhancing interfacial contact and inhibiting lithium dendrite. At last, the challenge and perspectives are discussed for development of LLZO in solid-state batteries.