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采用电化学扫描隧道显微镜(EC-STM)研究锂盐存在时,1-乙基-3-甲基咪唑二(三氟甲基磺酰)亚胺(EMITFSI)在Au(111)上的界面行为.随电位负移,表面过程主要分为3个阶段:(1)溶解在离子液体中的恒量氧气约在2 V还原,并与锂盐生成锂氧化物的网状结构;(2)溶液中的微量水约在1.5 V还原,并与锂盐生成较致密的氢氧化锂表面膜层;(3)当电位负移至约0.85 V时,离子液体的分解、锂的欠电位沉积以及锂-金合晶的形成共同发生,形成大量导电性较差的簇状结构膜,相应于金电极上初始形成的SEI膜.研究工作对于理解电极/离子液体界面性质及离子液体中的SEI膜具有重要意义.
The interfacial behavior of 1-ethyl-3-methylimidazolium bis (trifluoromethylsulfonyl) imide (EMITFSI) on Au (111) was investigated by electrochemical scanning tunneling microscope (EC-STM) With the negative potential shift, the surface process is mainly divided into three stages: (1) a constant amount of oxygen dissolved in the ionic liquid is reduced at about 2 V and reacts with the lithium salt to form a lithium oxide network structure; (2) (3) When the potential is negatively shifted to about 0.85 V, the decomposition of the ionic liquid, the underpotential deposition of lithium and the lithium- The formation of a large number of clusters with poor electrical conductivity corresponding to the SEI film initially formed on the gold electrode.It is of great significance to understand the properties of the electrode / ionic liquid interface and the SEI film in the ionic liquid.