Method for preparing thin-film positive electrode for thermal batteries

Abstract

The invention discloses a method for preparing a thin-film positive electrode for thermal batteries and belongs to the technical field of thin-film electrodes for thermal batteries. The method comprises the following steps: uniformly mixing active substances for positive electrodes, an electrolyte and carbon nano tubes in a certain mass ratio; then, adding a certain amount of distilled water, and adjusting the viscosity of the obtained mixture, so that the mixture becomes a pasty mixture and has certain viscosity; and enabling the pasty mixture to be uniformly adsorbed to the surface of a substrate by using a screen process press, and putting the substrate coated with the active substances into a vacuum drying oven to carry out vacuum drying, then obtaining the thin-film positive electrode for the thermal batteries. The thin-film positive electrode disclosed by the invention has the advantages of overcoming multiple defects caused by the existing powder compressing preparation process for the thermal battery electrodes, easily realizing the preparation of large-area or irregularly-shaped electrode plates, simplifying the electrode preparation process, improving the productivity, reducing the cost, and improving the stability and discharge performance of the batteries, therefore, the thin-film positive electrode has greater military and industrial application values.

Description

[0001] technical field [0002] The invention belongs to the technical field of thermal battery film electrodes, and in particular relates to a preparation method of a porous conductive material or a flexible conductive material matrix thermal battery thin film battery positive electrode. The invention mainly aims at solving the problems of low labor rate, high cost and poor performance in the current thermal battery production, and provides a feasible technical solution for the automatic high-quality production of the thermal battery. Background technique [0003] Thermal battery is also called molten salt battery. It uses molten salt as electrolyte, and uses mechanical activation device or electric activation device to melt the electrolyte instantly and output current to the outside. It is composed of single battery, ignition element, heating element, stack, insulating sheet, insulation layer, shell and so on. The single battery is composed of electrode sheets, electroly...

AI Technical Summary

Problems solved by technology

At present, the production of thermal batteries is generally labor-intensive, and the electrodes are prepared by powder pressing process. In this process, the positive electrode sheet, electrolyte diaphragm, and negative electrode sheet of each thermal battery cell need to be powder pressed three times, and finally stacked and pressed into a single cell. At the same time, due to the small batch demand for each type of thermal battery, the feasibility of automatic transformation of the powder tablet preparation process is very low, which will inevitably lead to low productivity of thermal batteries, and it is difficult to meet the needs of the development of modern advanced weapons

[0006] There are many shortcomings in the current powder tableting preparation process: 1. The preparation process is cumbersome, the personnel are redundant, and the production cost remains high; 2. It is difficult to press large-area powder. When the required electrode area is large, the existing powder press The sheet preparation process requires hundreds of tons of pressure for pressing, which is often difficult to meet; 3. Using a large number of workers makes it difficult to ensure the consistency of thermal battery performance, and it is inevitable that losses will be caused by negligence and mistakes for a long time; 4. Due to the existing powder pressing The essence of the sheet preparation process determines that the mixing uniformity between the positive electrode active material and the added electrolyte conductive agent is extremely difficult to control at the micro level, which is more obvious in the mixing of multiple electrolytes. The unevenness of the mixture promotes the internal resistance of the positive electrode and even the entire thermal battery. increases, reducing the overall performance of the thermal battery

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