LiSi/FeS2热电池正极活性材料利用率影响因素研究

摘要

The single-cell discharge experiments were applied to investigate the effect of discharge temperature, particle diameter of FeS2 and electrolyte concentration in cathode on the utility ratio of active cathode material in LiSi/FeS2 thermal battery.The relative mechanisms were explained in aspects of polarization and microcosmic appearance by pulse discharge experiments and test of field emission scanning electron microscope.The results indicate that the utility ratio of FeS2 increases with the diminishing FeS2 particle size(less than 250 μm) and the rising electrolyte concentration(10%-30%) in the condition of 450 ℃.In the condition of 550 ℃, the utility ratio of FeS2 increases with the higher electrolyte concentration when theparticle size of FeS2 is in the range of 120-250 μm, but, when the FeS2 particle size is 75-120 μm and less than 75 μm, the utility ratio of FeS2 first increases, and then decreases, with the increasing electrolyte concentration.%采用单体电池放电实验,研究了LiSi/FeS2热电池中放电温度、FeS2粒径和正极中电解质含量对正极活性材料FeS2利用率的影响,并通过脉冲放电实验和场发射扫描电镜测试,从极化和微观形貌方面阐释了相关影响机理.研究结果表明,在450 ℃条件下,FeS2利用率随着其粒径(小于250 μm)的减小和电解质含量(10%~30%)的升高而增大;在550 ℃条件下,当FeS2粒径在120~250 μm时,FeS2利用率随着电解质含量的增加而增大,当FeS2粒径为75~120 μm和<75 μm时,FeS2利用率随着电解质含量的增加先增大后减小.