Abstract: A lithium aluminum silicate (LAS) glass-ceramic has an average coefficient of thermal expansion (CTE) in a range from 0 to 50° C. of at most 0±0.1×10?6/K and a thermal hysteresis at least in a temperature range from 15° C. to 35° C. of <0.1 ppm. The LAS glass-ceramic includes (in mol % based on oxide): SiO2 60-<70; Li2O 7-9.6; MgO+ZnO>0.5-1.5; R2O>0.5, where R2O is Na2O and/or K2O and/or Cs2O and/or Rb2O; and nucleating agent with a content of 1.5 to 6 mol %. The nucleating agent is at least one component selected from the group consisting of TiO2, ZrO2, Ta2O5, Nb2O5, SnO2, MoO3, WO3 and HfO2.

Abstract: A glass ceramic is provided that has at least one crystal phase that conducts lithium ions and a total content of Ta2O5 of at least 0.5 wt. %. The glass ceramic finds utility as a component selected from the group consisting of a lithium ion battery, an electrolyte in a lithium ion battery, an electrode component in a lithium ion battery, an additive to a liquid electrolyte in a lithium ion battery, a coating on an electrode in a lithium ion battery, and combinations thereof.