Electrochemical properties of all-solid-state lithium secondary batteries using Li-argyrodite Li6PS5Cl as solid electrolyte

Abstract Solid-state electrolytes are being intensively explored as the key to develop all-solid-lithium secondary batteries which present safety advantages over present liquid Li-ion technology. To validate the use of the Li 6 PS 5 Cl-based solid electrolyte obtained by high energy ball milling, all-solid-state batteries using LiCoO 2 and Li 4 Ti 5 O 12 as active material (AM) have been realized. The optimization of the electrode composition led to a maximum of 46 and 27 mAh per gram of composite for LiCoO 2 and Li 4 Ti 5 O 12 -based half-cells respectively. The assembled all-solid-state LiCoO 2 /Li 6 PS 5 Cl/Li 4 Ti 5 O 12 battery presents a sustainable reversible capacity of 27 mAh per gram of AM and a coulombicic efficiency close to 99%.