Preparation method of thermal battery positive electrode material, and thermal battery made of thermal battery positive electrode material

Abstract

The invention discloses a preparation method of a thermal battery positive electrode material. The preparation method comprises the following steps: 1, mixing iron disulfide with additives in dry gas environment until the iron disulfide and the additives are uniform, putting the obtained mixture in a reaction furnace, continuously introducing an inert gas to the reaction furnace, rising the temperature in the reaction furnace to 320-550 DEG C, keeping the temperature for 0.5-8 h, taking out the obtained iron disulfide positive electrode material when the temperature in the reaction furnace decreases to 50 DEG C or below, crushing the iron disulfide positive electrode material, and sieving the crushed iron disulfide positive electrode material; 2, mixing cobalt sulfide with the additives until the cobalt sulfide and the additives are uniform, putting the obtained mixture in the reaction furnace, continuously introducing an inert gas to the reaction furnace, rising the temperature in the reaction furnace to 320-550 DEG C, keeping the temperature for 0.5-8 h, taking out the obtained iron disulfide positive electrode material when the temperature in the reaction furnace decreases to 50 DEG C or below, crushing the cobalt disulfide positive electrode material, and sieving the crushed cobalt disulfide positive electrode material; and 3, mixing the iron disulfide positive electrode material with the cobalt disulfide positive electrode material until the iron disulfide positive electrode material and the cobalt disulfide positive electrode material are uniform in order to prepare the polynary positive electrode material. The invention also discloses a thermal battery made of the positive electrode material.

Description

technical field [0001] The invention belongs to the field of chemical materials, and relates to a thermal battery cathode material and a thermal battery prepared from the cathode material. Background technique [0002] As a one-time storage battery, when the thermal battery is not activated, the electrolyte is a non-conductive solid, which can be stored for a long time without performance degradation; when activated, the electrolyte rapidly melts to form a high-conductivity ion conductor, and the battery can be used in a very short period of time. power transmission. These advantages make thermal batteries widely used in weapon systems and space survey systems. Thermal batteries also have applications in other fields, such as electric vehicles, aircraft emergency systems, and geothermal drilling. [0003] In a typical thermal battery, in addition to the heating system and insulation system, its electrochemical system includes a negative electrode, a positive electrode, and...

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Problems solved by technology

Iron disulfide is mainly extracted from natural ores, with stable performance and low price, but the resistivity is relatively large (17.7), and the thermal decomposition temperature is 550°C

Cobalt disulfide is a positive electrode material active material developed for the weakness of iron disulfide. The electronic conductivity has been greatly improved, the resistivity is only 0.002, and the thermal decomposition temperature has increased by about 100°C; but cobalt disulfide can only Manufactured by synthetic methods, expensive

[0006] As far as the public documents that can be found at present, the positive electrode material of the thermal battery either contains iron disulfide or cobalt disulfide, and there is no report containing iron disulfide and cobalt disulfide at the same time.

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