In Situ Observation of Electrolyte-Concentration-Dependent Solid Electrolyte Interphase on Graphite in Dimethyl Sulfoxide
In Situ Observation of Electrolyte-Concentration-Dependent Solid Electrolyte Interphase on Graphite in Dimethyl Sulfoxide
复制标题
二甲基亚砜中石墨上电解质浓度依赖性固体电解质界面的原位观察
DOI：
10.1021/acsami.5b01024
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发表时间：
2015-05-13
影响因子：
9.5
通讯作者：
Wang, Dong
中科院分区：
文献类型：
--
作者：
Liu, Xing-Rui;Wang, Lin;Wang, Dong
高锂盐浓度策略最近已被报道是使各种有机溶剂作为电池电解质的有效方法。在这里，我们利用原位原子力显微镜（AFM）研究在不同浓度的二甲基亚砜（DMSO）为基础的电解质的石墨电极的界面形态。石墨在不同浓度电解液中的界面特征存在显著差异。都被揭露了在浓电解液中，稳定的膜主要在初始电化学循环后石墨表面上的台阶边缘和缺陷处形成。另一方面，在稀电解质中，DMSO溶剂化的锂离子不断地插入石墨层中，并且观察到溶剂的严重分解伴随着石墨表面的结构劣化。原位AFM结果为石墨电极与DMSO基电解液之间存在浓度依赖性界面反应提供了直接证据。
High lithium salt concentration strategy has been recently reported to be an effective method to enable various organic solvents as electrolyte of batteries. Here, we utilize in situ atomic force microscopy (AFM) to investigate the interfacial morphology on the graphite electrode in dimethyl sulfoxide (DMSO)-based electrolyte of various concentrations. The significant differences in interfacial features of the graphite in electrolytes of different concentrations. are revealed. In the concentrated electrolyte, stable films form primarily at the step edges and defects on the graphite surface after initial electrochemical cycling. On the other hand, in the dilute electrolyte; DMSO-solvated lithium ions constantly intercalate into graphite layers, and serious decomposition of solvent accompanied by structural deterioration of the graphite surface is observed. The in situ AFM results provide direct evidence for the concentration-dependent interface reactions between graphite electrode and DMSO-based electrolyte.