Glass-ceramic materials based on lithium aluminium silicate found widespread applications as a zero-expansion material in optics or as a temperature resistant material for fireplaces and oven cook stoves. We will present recent developments of two new types of glass-ceramics based on Li7La3Zr2O12 (LLZO) and within the LiSICon structure, produced by a melting and ceramization route, which reveal promising Li-ion conductivities in the range of 10-3 S/cm at room temperature. Additionally glass-ceramics with nano-grain ferroelectric or para-electric crystalline phases are presented as a new dielectric material for high-performance electrical capacitors.