两种常用电解质体系的LiB/FeS_2热电池性能的差异及其影响机理的研究  

Performance Differences of LiB/FeS_2 Thermal Batteries with Two Popular Electrolyte Systems & Relative Mechanism Analysis

作　　者：种晋[1] 董静[1] 张霣霞 朱金城[1] 汪继强[1] 

机构地区：[1]中国电子科技集团公司第18研究所,天津300381

出　　处：《中国电子科学研究院学报》2007年第4期365-370,共6页Journal of China Academy of Electronics and Information Technology

摘　　要：与采用LiCl-KCl-MgO相比,采用LiF-LiCl-LiBr-MgO电解质的LiB/FeS2热电池的放电电压平稳和容量高,在高电流密度下的差异更大(如300mA·cm-2下容量高出2倍以上)。同时这种电池在径向2048.2m·s-2离心力作用下,依然可稳定工作;而采用LiCl-KCl-MgO的电池即使在较低离心力作用下,却很快短路失效。采用SEM和能谱分析发现了两种熔融盐快速冷却后的颗粒特征与微区成分有明显差别,确认了熔融LiF-LiCl-LiBr对MgO润湿性好,而LiCl-KCl对MgO润湿性差。由此揭示了两种电解质在离心条件下对电池性能影响的机理。Comparing those with LiCl KCl MgO, LiB/FeS2 thermal batteries with LiF LiCl LiBr MgO as electrolyte show a flatter voltage plateau ＆ higher capacity, 300 mA/cm^2. Besides, such batteries can also be operated two times higher obtained at current density of well under 2 048.2 m · s^-2 radial centrifugal force, but those with LiCl KCl MgO show fast failure due to shortage, even under smaller radial centrifugal force. It is found by SEM ＆ energy spectroscope that both particle characteristics ＆ composition in relative micro area are quite different for two electrolytes. Results indicate that LiF LiCl LiBr molten salts can wet the MgO completely, but LiCl KCl is bad for wetting MgO. Hence, the mechanism of the effect of two electrolytes on the battery performance has been explored.

关 键 词：热电池 电解质 微观形貌 

分 类 号：V242.2[航空宇航科学与技术—飞行器设计]