Hebei Messi Biology Co., Ltd. said that magnesium oxide inhibits the flow of polyhalide lithium salt electrolytes at high temperatures, ensuring the safety of thermal batteries. The physical properties of different types of magnesium oxide materials were compared and analyzed, and their adsorption properties for lithium salt electrolytes were analyzed through overflow experiments. The results showed that MgO materials with small tap density and large specific surface area exhibited the optimal adsorption performance.
The single pole piece of the thermal battery is composed of heating material, positive electrode, electrolyte and negative electrode. When the battery is activated, the heating material is ignited and starts to provide heat for the battery. After the internal temperature of the battery is higher than the melting point of the electrolyte, the electrolyte melts. And form an ion path between the positive and negative electrodes, and start to discharge when the external circuit is loaded. However, due to the fluidity of the electrolyte in the molten state, it is easy to cause electrolyte leakage, accelerate self-discharge, and cause internal short circuit in severe cases, burying a safety hazard for the battery.
In order to inhibit the flow of the electrolyte during the discharge process, a chemically inert adsorption material is usually added to the electrolyte layer, and magnesium oxide is currently the most commonly used flow inhibitor in the field of lithium-based thermal batteries, mainly through the capillary adsorption of the material itself. , fix the molten electrolyte in the pores of the magnesium oxide material. The electrolyte flow inhibition effect will be enhanced with the increase of the addition ratio of magnesium oxide material, but when the addition amount of magnesium oxide is too high, the internal resistance of the thermal battery will increase and the pulse performance will be weakened. Therefore, reducing the addition ratio of MgO materials while achieving a good electrolyte flow inhibitory effect is a hot and difficult point in the study of thermal battery flow inhibitors, which puts forward higher requirements for the physical and chemical properties of MgO materials. Require.
This experiment compares and explores the differences in bulk density, particle size distribution, specific surface area, and microscopic morphology of different types of magnesium oxide materials, and uses different types of magnesium oxide materials to prepare spacers for electrolyte overflow rate testing and evaluation. The adsorption of different magnesium oxide materials on the electrolyte, and finally screen out the magnesium oxide material with the best adsorption effect to meet the application requirements of thermal batteries.
1 Experimental part
1.1 Physical performance test of magnesium oxide material
In this experiment…
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