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1. A method of synthesizing a solid-state electrolyte for use in a lithium-ion battery, the method comprising: uniformly mixing at least LiOH and LiHal in stoichiometric quantities thus forming a uniform mixture of the at least LiOH and LiHal: heating the uniform mixture to a mixture melting temperature thus forming a mixture melt; causing a reaction of formula (2LiOH+LiHal=Li3HalO+H2O) between the at least LiOH and LiHal in a process free of forming an anti-perovskite structure and at a temperature, at which H2O that is formed in the aforementioned reaction is converted into a bound form, whereby a reaction product is obtained: and cooling the reaction product to a solid state, whereby a solid-state electrolyte for use in a lithium-ion battery is obtained; the Hal being selected at least from CI, Br, and/or I; the synthesizing being carried out in solid electrolyte synthesizing tools comprising a container having a container bottom and made of a heat-resistant material, a cuvette having a cuvette bottom placed onto the container bottom, and a pallet having a top surface and placed onto the cuvette bottom, and wherein, prior to the step of heating the uniform mixture, the solid electrolyte synthesizing tools being preheated to a temperature in the range of 180° C. to 220° C., and the uniform mixture is then loaded onto the top surface of the pallet, wherein the cuvette is made of a metal foil, the pallet is made of metal, and the top surface of the pallet has a polished surface.
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