单质硫对钠-氯化镍电池循环性能影响的机理分析  

Influence of sulfur additive on the cycling performance of sodium-nickel chloride battery and its mechanism analysis

作　　者：敖昕[1] 吴相伟[1] 胡瑛瑛[1] 温兆银[1] 

机构地区：[1]中国科学院上海硅酸盐研究所,中国科学院院能量转换材料重点实验室,上海200050

出　　处：《储能科学与技术》2016年第3期349-354,共6页Energy Storage Science and Technology

基　　金：国家自然科学基金项目(51402333,51372263)

摘　　要：制备了含有不同单质硫添加剂的钠-氯化镍电池,对其进行电化学性能测试,结果表明,在正极中添加单质硫能有效提高电池的循环性能,NaAlCl_4中含5%(质量分数)单质硫的电池具有最佳的循环性能。微结构和相组成分析发现,单质硫在电池的工作温度下可与金属Ni反应并在其表面生成Ni_3S_2修饰层。该修饰层能阻止邻近的金属镍在循环过程中的团聚从而抑制金属Ni的长大,进而提高电池循环性能。循环后期容量衰减的主要原因是正极中NaCl颗粒的长大。Sodium-nickel chloride cells with different contents of sulfur were prepared. Electrochemical test results of the cells showed that the addition of sulfur in the cathode significantly improve cycling performance of the cells, among which 5%（weight ratio） additive performed the best. According to the phase and morphological characterizations for the cathode, a mechanism based on the Ni3S2 layer modification resulted from the reaction between the added sulfur and nickel particles during the cell cycling was supposed. The Ni3S2 modification layer was proved effective to prevent the growth of nickel particle in the electrode and therefore improve the cycling performance of the cell. Growth of Na Cl particles was ascribed to capacity degradation of the cell at the late cycling stage.

关 键 词：钠-氯化物电池 ZEBRA电池 循环性能 机理分析 正极添加剂 

分 类 号：TM911[电气工程—电力电子与电力传动]