Lithium ion conductive glass-ceramics and the use of the glass ceramic

The glass-ceramic comprises at least one lithium ion conductive crystal phase and a total content of Ta The glass ceramic is preferred as a component of a lithium ion battery, as the electrolyte in a lithium ion battery, as a part of an electrode in a lithium ion battery, as an additive to a liquid electrolyte in a lithium ion battery or as a coating on an electrode in a lithium ion battery.