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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 MgF2. 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.

In this work porous MgO fibers were investigated as an immobilizing agent in the solid molten salt electrolytes for thermal batteries. Their distribution, uniformity and electrochemical performance were characterized. Compared with ball-milling method, the use of liquid nitrogen as mixing medium resulted in an homogeneous distribution of molten salt particles on the surface of porous MgO fibers. The ionic conductivity of the separator using porous MgO fibers as an immobilizing agent is slightly higher than that of the separator when MgO powders were used as the immobilizing agent. Moreover, the discharge specific capacity of the battery using the porous MgO fibers, 564.39 mAh*g[?]1, is significantly greater than that of the battery using MgO powders, 355.67 mAh*g[?]1. More importantly, the electrolyte leakage content of the separator based on porous MgO fibers is also the lowest. Porous MgO fibers offer promising application in thermal batteries.

Cubic phase nickel disulfide (NiS2) materials have been synthesized via hydrothermal method with the reactants of NiSO4, S and FeSO4. The size of the synthetic NiS2 particles is about 2.8 um in average according to the laser particle size analysis. The discharging experiments reveal that the NiS2 has smaller polarization than that of the natural FeS2 due to its small electrical resistivity and large surface area contacting with electrolytes. When discharging at the condition of large current density or pulse current density, the NiS2 thermal battery shows better electrochemical performance than that of the FeS2 thermal battery.

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-1at 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 MgF2. 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.

In this work porous MgO fibers were investigated as an immobilizing agent in the solid molten salt electrolytes for thermal batteries. Their distribution, uniformity and electrochemical performance were characterized. Compared with ball-milling method, the use of liquid nitrogen as mixing medium resulted in an homogeneous distribution of molten salt particles on the surface of porous MgO fibers. The ionic conductivity of the separator using porous MgO fibers as an immobilizing agent is slightly higher than that of the separator when MgO powders were used as the immobilizing agent. Moreover, the discharge specific capacity of the battery using the porous MgO fibers, 564.39 mAh·g−1, is significantly greater than that of the battery using MgO powders, 355.67 mAh·g−1. More importantly, the electrolyte leakage content of the separator based on porous MgO fibers is also the lowest. Porous MgO fibers offer promising application in thermal batteries.

Cubic phase nickel disulfide (NiS2) materials have been synthesized via hydrothermal method with the reactants of NiSO4, S and FeSO4. The size of the synthetic NiS2particles is about 2.8 μm in average according to the laser particle size analysis. The discharging experiments reveal that the NiS2has smaller polarization than that of the natural FeS2due to its small electrical resistivity and large surface area contacting with electrolytes. When discharging at the condition of large current density or pulse current density, the NiS2thermal battery shows better electrochemical performance than that of the FeS2thermal battery.

Cubic phase nickel disulfide (NiS2) materials have been synthesized via hydrothermal method with the reactants of NiSO4, S and FeSO4. The size of the synthetic NiS2particles is about 2.8 μm in average according to the laser particle size analysis. The discharging experiments reveal that the NiS2has smaller polarization than that of the natural FeS2due to its small electrical resistivity and large surface area contacting with electrolytes. When discharging at the condition of large current density or pulse current density, the NiS2thermal battery shows better electrochemical performance than that of the FeS2thermal battery.