SU936100A1 - Method of producing solid ion electrolytes of ag4 mj5 type - Google Patents

Description

one

The invention relates to the production of solid electrolytes with high ionic conductivity of the type, -, where M is potassium, rubidium or ammonium ions, and can be used for production. Capacities of electrochemical capacitors with high values of capacitance and specific charge.

A known method for synthesizing the solid electrolyte Ag.Rbl5 is by melting a mixture of Rbl and Hell I taken in a molar ratio T :, in a crucible, heating the melt to 300 ° C and aging for 0.5 h, rapidly cooling the melt in air, grinding solid, jth substance, pressing into tablets and roasting at 200 ° C for 50.

The disadvantage of this method is the necessity of grinding the solidified melt, pressing into tablets and annealing at 200 ° C for 50 hours.

The closest to the proposed technical essence is a method of obtaining solid ionic electrolytes of the type AdlM1,., Where M is potassium, rubidium or ammonium ions, including melting a stoichiometric mixture of ammonium iodides or alkali metal, tal and silver in an inert atmosphere, followed by cooling va in the air 23 ....

The disadvantage of this method is the need for long-term annealing of the hardened melt to achieve a high value (0.25-0.26 OM ICM- at 25 ° C) of ionic conductivity, so after cooling the ionic conductivity of the melt is only 0.15 ohm-cm. However, in the case of the impregnation of the anodes of the capacitors with the Ag Rblg- melt, annealing is impossible because during the annealing process and subsequent cooling the cracking and exfoliation of the electrolyte from the anode surface occurs.

Claims (2)

The purpose of the invention is to increase the ionic conductivity after crystallization of the melt and increase its thermodynamic stability. The goal is achieved by the method of producing solid ionic electrolytes of the type, where M is potassium, rubidium or ammonium ions, which includes melting a stoichiometric mixture of ammonium or alkali metal and silver iodides in an inert atmosphere, followed by cooling to melt in air, to add 1,3-75 masd of silver sulphide at 350 - 50С. Note 1. 50 g of a mixture containing 0-78 g of Agl and g of Rbl,, 15 is melted in a glass ampoule in an argon atmosphere at. 0.63 g (1.3 wt.%} Addg $ is added to the melt. After 5 minutes exposure with occasional stirring of the melt by stirring, an ampule is removed from the furnace and cooled in air to room temperature. Ionic conductivity of the resulting product is 0.24 Ohms at 25 C. 2S. Example 2, 50 g of a mixture containing 0.78 g of Agl and 9.22 g of Rbt is melted in a glass ampoule in aprorta atmosphere at AOO C. In the melt, 0.75 (mas) Ag, After sp 10 minutes of exposure with occasional stirring of the melt by shaking, the ampoule is removed from the oven and cooled in air to room temp. pills. The ionic conductivity of the obtained product is 0.26 Ω. cm at 25 C. Example 3. 50 g of the finished electrolyte with (0.25 Ω when melted in a glass ampoule in an argon atmosphere at 350 ° C. 0.88 g was added to the melt ( 1.75 mas.). After a 10-minute soak with periodic stirring by shaking, the ampule was removed 04 from the oven and cooled in air to room temperature. The ionic conductivity of the resulting product Q, Ohm x X cm at 25 C. The implementation of the proposed method allows does not produce high electrolyte solid electrolytes of ionic type without conducting annealing of the solidified melt, as well as to ensure the high electrochemical and mechanical properties of the anodes of the capacitors impregnated with the A melt. When re-melting the electrolyte obtained by the proposed method, the ionic conductivity value of the solidified melt practically coincides with the original, Formula of the invention .., where M is potassium, rubidium or ammonium ions, including the melting of a stoichiometric mixture of ammonium or alkali metal iodides and sulfur ribs in an inert atmosphere, followed by cooling the melt in air, which is also distinguished by the fact that, in order to increase the ionic conductivity after crystallization of the melt and increase its thermodynamic stability, 1.3 to 1.75 wt.% silver sulfide is added to the melt 350 - 50С. Sources of information taken into account during the examination 1. Physical chemistry and electrochemistry of molten and solid electrolytes. 4.1. Sverdlovsk, 1973 p.137138. 2. Bradtey I. Greene P. SoEMs with high ionic conductivi ti in group 1 gotide systems. Trans.Faraday Soc, 1967i 63 Vf 2, p. “2At430.