Research On The Mixing Processing Of Porous Magnesia Fiber And Solid Molten Salt

Electrolyte leakage is easily caused in the thermal battery with solid molten salt electrolyte in the working environment, leading to a series of adverse effects. Therefore, in practical application, some binders are added to the separator. In our work, porous magnesia fibers, which were successfully prepared by hydrothermal reaction, is used as a binder to improve immobilizing effect for thermal battery due to its complex network structure and porous structure.In order to make magnesia porous fiber better used in thermal batteries, the mixing process for porous magnesia fiber and binary solid molten salt electrolyte was deeply investigated. Moreover, to enhance the uniformity and improve the effect of mixing process, the mixing method and media were modified. The results were demonstrated that using liquid nitrogen as a mixing media resulted in an homogeneous distribution between molten salt electrolyte and porous fibers, and effectively facilitate uniform distribution of molten salt electrolytes on the surface of the porous fiber, compared to traditional ball-milling hybrid approach. In addition, it also maintains the strength and structure of porous fibers. Meanwhile, compared to n-hexane, isopropyl alcohol, water/PEG using as the mixed media, the dispersion effect of the EB powders was found that n-hexane as a mixed media also can ensure better mixing uniformi ty.Based on above, the optimized mixing process of ternary molten salt electrolyte and porous fiber is also conducted. Firstly, the molten salt electrolytes were mixed by ball-milling method, then liquid nitrogen and n-hexane as the medium for mixing porous fibers and molten salts, and the uniformity and related performance tests were characterized. The results show that the EB powder s mixed by the two media respectively indicated a good mixing process effect, but liquid nitrogen as the mixing medium is more obvious. Finally, the porous fiber and magnesium oxide powders were compared and verified as the binder for thermal battery, and we found that the use of porous fibers as a binder can significantly improve the mixing process effect, including the unifor mity, discharge capacity, the conductivity and electrolyte leakage.