High-conductivity film phase change material for thermal battery, preparation method and application

Abstract

The invention discloses a high-conductivity film phase change material for a thermal battery in the technical field of thermal batteries. Raw materials comprise: a soluble inorganic salt, a conductiveagent and an adhesive, wherein the soluble inorganic salt comprises at least two of NaCl, Na2SO4, Na2CO3, KCl, K2SO4, K2CO3, LiCl, Li2SO4, Li2CO3, MgCl2 and MgSO4, and the conductive agent comprisesone of expanded graphite, carbon nanotubes, graphene and activated carbon. The preparation method comprises the following steps: dissolving the easily soluble inorganic salt in water by using the principle that the easily soluble inorganic salt is soluble in water, fully stirring and mixing the components, mixing the conductive agent and the soluble inorganic salt together by using the adhesive toform slurry, and coating the slurry to form the thin film phase change material. Firstly, phase change is utilized to slow down thermal shock and prolong the working time of the electrolyte; secondly, the conductive agent plays a conductive role, electrons can be transmitted through the high-conductivity thin film phase change material, and then the service life of the thermal battery is prolonged.

Description

technical field [0001] The invention belongs to the technical field of thermal batteries, and in particular relates to a high-conductivity thin-film phase-change material for thermal batteries, a preparation method and application thereof. Background technique [0002] The thermal battery is a fast-activated lithium molten salt battery. It ignites the internal heating system by means of electrical activation or mechanical activation, and releases a large amount of heat in a short time, turning the non-conductive solid inorganic electrolyte into a high-conductivity liquid electrolyte, thereby The thermal battery starts working. At room temperature, the internal resistance of the solid inorganic electrolyte is very large, and the thermal battery has almost no self-discharge. When the heating system rapidly raises the temperature inside the thermal battery to above the melting point of the solid electrolyte, a high-conductivity ionic conductor electrolyte is formed, and the th...

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Problems solved by technology

But Fe-KClO 4 The thermal shock temperature at the initial stage of the reaction can reach 1000 ° C ~ 1300 ° C, and the commonly used positive electrode material is FeS 2 and CoS 2 , and their decomposition temperatures are 550°C and 650°C respectively. High temperature will lead to the decomposition of positive electrode materials, generate sulfur vapor, and increase the internal pressure of the battery, which will cause the local temperature of the battery to run out of control in the initial stage of the reaction, and the battery will explode and other adverse consequences.

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