FLEXIBLE THIN-FILM POSITIVE ELECTRODE AND METHOD OF MANUFACTURING 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, iodine-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 film composite iodised by a diffusion method. Composite consists of a mixture of polyvinyl alcohol in amount of 75–85 wt. %, tetramethylammonium iodide (CH₃)₄NI in amount of 10–25 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. Thus for producing a flexible thin film positive electrode for solid-state primary current source taking polyvinyl alcohol, tetramethylammonium iodide, (CH₃)₄NI and the electroconductive carbon black in ratio of (75–85):(10–25):(1–6) % by weight, polyvinyl alcohol and tetramethylammonium iodide (CH₃)₄NI are mixed with addition of dimethylsulphoxide while heating to temperature no more than 85 °C until complete dissolution. Electro-conducting 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 of a clock, a homogeneous film is obtained, which is then rolled on rollers, followed by placing it in a sealed chamber with crystalline iodine for 10–14 days, after which the film is deposited on the current conducting collector 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