FLEXIBLE THIN-FILM POSITIVE ELECTRODE AND METHOD OF MANUFACTURE THEREOF Russian patent published in 2020 - IPC H01M4/08 H01M6/18 

FIELD: electrical engineering.

SUBSTANCE: invention relates to electrical engineering and can be used in production of primary chemical current sources, and more specifically iodide-silver solid-state primary current sources. Flexible thin-film positive electrode for a solid-state primary current source has a current collector with an active material pressed onto its surface in the form of a flexible composite iodised by a diffusion method. Composite consists of a mixture of polyvinyl alcohol in amount of 80–90 wt. %, tetraethylammonium iodide (C₂H₅)₄NI in amount of 5–12 wt. % and electrically conductive soot in amount of 1–6 wt. % in terms of dry substance. Composite film thickness can be 0.01–0.2 mm. For making a flexible thin-film positive electrode for a solid-state primary current source, polyvinyl alcohol, tetraethylammonium iodide (C₂H₅)₄NI and electroconductive carbon black are taken at ratio of (80–90):(5–12):(1–6) wt. %, polyvinyl alcohol and tetraethylammonium iodide (C₂H₅)₄NI are mixed with addition of dimethylsulphoxide while heating to a temperature of not more than 85 °C until complete dissolution. Electroconductive soot is added to the obtained solution, the mixture is treated with ultrasound, and from the obtained suspension by watering and drying in a vacuum at a temperature of not more than 70 °C, a homogeneous film is obtained, which is then rolled on rollers, with its subsequent arrangement in a sealed chamber with crystalline iodine for 10–14 days, after which the film is applied on the current-conducting header by pressing.

EFFECT: technical result is increase in specific electrical characteristics of primary chemical current source with simultaneous reduction of its dimensions and increase in its storage life.

4 cl, 2 ex