热电池正极CoS2在不同熔盐中的放电特性

摘要

The discharge characteristics of CoS2 in LiF-LiCl-LiBr and LiCl-KCl molten salt systems were studied. The results show that CoS2 has three discharge plateaus in molten salts for Li-B/CoS2 cells. Its discharge capacity is related to self-discharge and polarization, and self-discharge is attributed to the metal ic lithium solubility in molten salts. In LiF-LiCl-LiBr molten salt system, the capacity loss in low discharge current density (<200 mA/cm2) mainly comes from self-discharge reaction of first discharge plateau. In LiCl-KCl molten salt system, the capacities of three discharge plateaus in large current density al decrease due to polarization, especial y for the third plateau. The Li-B/LiF-LiCl-LiBr/CoS2 cells exhibit higher voltage and capacity in large discharge current density, but Li-B/LiCl-KCl/CoS2 cells have higher capacity in low discharge current density.%对热电池正极二硫化钴在LiF-LiCl-LiBr和LiCl-KCl两种熔盐体系中的放电特性进行了研究，结果表明：对于Li-B/CoS2热电池，二硫化钴存在三个放电平台；二硫化钴的放电容量大小与自放电和极化有关，自放电损耗的主要原因是Li-B合金负极中的金属锂在熔盐内的溶解；在LiF-LiCl-LiBr体系中、小电流密度(<200 mA/cm2)放电条件下，二硫化钴容量的损耗主要由其第一放电平台的自放电引起，在LiCl-KCl体系中、大电流密度放电条件下，由于极化原因各放电平台的容量均有所下降，尤其以第三平台最为明显；Li-B/LiCl-KCl/CoS2体系在小电流放电时具有高的放电容量，但在大电流放电条件下Li-B/LiF-LiCl-LiBr/CoS2体系则表现出高的工作电压和放电容量。