Method of synthesizing a solid-state electrolyte for use in a lithium-ion battery

Proposed is a method of synthesizing a solid-state electrolyte of Li3HalO formula for use in a lithium-ion battery. The method consists of uniformly mixing at least LiOH and LiHal in a stoichiometric quantities, heating the prepared mixture to a melting temperature and causing a reaction of formula (2LiOH+LiHal=Li3HalO+H2O) between the at least LiOH and LiHal in a process free of forming a perovskite structure and at a temperature, at which H2O that forms at the aforementioned reaction is converted into a bound form, whereby a reaction product is obtained. According to another modification of the method, prior to the stage of melting the mixture, a reinforcement mesh is immersed into the mixture, whereby after mixture is solidified, a solid-state electrolyte reinforced with the mixture embedded into its material is obtained.