ELECTROLYTE MASS AND METHOD OF MAKING ELECTROLYTE FOR THERMAL CHEMICAL SOURCES OF CURRENT Russian patent published in 2020 - IPC H01M6/18 H01M6/36 

FIELD: electricity.

SUBSTANCE: invention relates to production of electrolytes for thermal (solid-state) chemical current sources (TCCS) and can be used to produce electrolytes based on lithium compounds. According to the invention, the electrolytic mixture for TCCS contains a mixture of lithium halides and a thickener, wherein lithium halide mixture contains a three-component mixture of Li (Cl, Br, F) salts, and high-dispersed powder as a thickener γ-LiAlO₂ in following ratio of ingredients, wt. %: Li (Cl, Br, F) 45–55, γ-LiAlO₂ is rest. Method of producing solid electrolyte for TCCS involves initial preparation of electrolyte mass based on a mixture of lithium halides, mixing the mixture with a thickener, subsequent heat treatment and moulding the obtained mixture to obtain a solid electrolyte, according to the invention, the initial mixture of lithium halides is obtained by melting, pre-dried at temperature of not more than 200 °C and pressure of not more than 60 mm Hg for not less than 6 hours components of a eutectic mixture of lithium salts with content of said components, wt. %: lithium fluoride 9.52–9.66; lithium chloride 21.99–22.06 and lithium bromide 68.49–68.28, which is melted in a stream of gaseous hydrogen chloride for not more than 2.5 hours and cooled in said medium, and as a thickener is used finely dispersed powder of lithium - gamma-aluminate (γ-LiAlO₂) obtained by synthesis as a result of solid-phase reaction between lithium and aluminium hydroxides at high temperatures with performance of a series of successive heating stages from 300 °C to 950 °C, wherein in the process of synthesis of the thickener, the achievement of the nominal level of characteristics of the end product is achieved by determining the basic elements of lithium and aluminium by flame atomic emission and atomic absorption spectrometry, determining specific surface area by adsorption method based on argon desorbed desorption and establishing correlation of crystal structure to tetragonal crystal lattice by X-ray diffraction analysis, after which the synthesized thickener is impregnated with molten eutectic mixture of salts of lithium halides, with the following ratio of ingredients, wt. %: salt from group of lithium halides 45.0–55.0; lithium gamma-aluminate (γ-LiAlO₂) 55–45, with holding mixture at temperature in range of 600–650 °C until complete melting, then the mixture is homogenised, cooled in argon medium, milled, sieved and the obtained material is monitored, and the final mixture is moulded to obtain solid electrolyte for TCCS.

EFFECT: high purity of finished product and electroconductivity of solid electrolyte for TCCS with high discharge characteristics.

2 cl, 2 ex, 1 tbl, 1 dwg