High-strength all-solid lithium ion electrodes based on Li4Ti5O12

► 97% dense 100 mm thick Li4Ti5O12-Li0.29La0.57TiO3-Ag electrodes were sintered. ► The electrode delivered full capacity in the first discharge at C/40 discharge rate. ► 3D percolated solid electrolyte and metal enable ionic and electronic transport. ► The sintered electrode has the highest strength (90 MPa) to date. ► The sintered electrode has the highest modulus (29 GPa) to date.