Ion Transport in MgO Porous Fibers Retained Molten Salt Electrolytes for Thermal Batteries

Abstract

In this paper, the pristine and hydrofluoric acid (HF) modified MgO porous fibers are investigated as an immobilizing agent for LiF-LiCl-LiBr molten salt electrolytes. The electrochemical performance of as prepared thermal batteries is evaluated. Compared to pristine MgO porous fibers, significantly reduced electrolyte leakages and the highest ionic conductivity (1.427 S • cm -1 ) of the electrolyte are obtained when the MgO porous fiber is modified by using 40 mol% (of the MgO fiber) HF solution. Accordingly, the discharge capacity of 456 mAh • g -1 at 1.0 V voltage plateau is obtained. At the same time, the influence of HF modification on the ion transportation is discussed, based on element diffusion and properties of newly formed MgF 2 . It can be concluded that HF modification is a promising method to improve the performance of MgO porous fibers used as an immobilizing agent for the molten salt electrolyte in thermal batteries.

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