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Observation of the intercalation of dimethyl sulfoxide-solvated lithium ion into graphite and decomposition of the ternary graphite intercalation compound using in situ Raman spectroscopy
Electrochimica Acta ( IF 6.6 ) Pub Date : 2018-01-10 , DOI: 10.1016/j.electacta.2018.01.035
Shohei Maruyama , Tomokazu Fukutsuka , Kohei Miyazaki , Takeshi Abe

Dimethyl sulfoxide (DMSO) is electrochemically co-intercalated with lithium ions into graphite to form a stable ternary graphite-intercalation-compound (GIC), Li-DMSO-GIC. To elucidate the details of the co-intercalation behavior, in situ Raman spectroscopy was performed to observe the structural variations in graphite during the potential scan. During the scan from 2.44 to 1.00 V, DMSO was co-intercalated with lithium ions into graphite, exhibiting a staged structure. The stage number decreased from 4 to 1. During the scan from 1.00 to 2.44 V, the deintercalation of DMSO-solvated lithium ions was observed. After experienced a potential cycle between 2.4 and 0 V, the graphite exhibited significant changes that are ascribed to the exfoliation of graphite, implying that the destruction of the graphite composite electrode is likely to be caused by the decomposition of DMSO within the graphite layer.



中文翻译:

原位拉曼光谱观察二甲基亚砜溶剂化的锂离子嵌入石墨中以及三元石墨嵌入化合物的分解

二甲基亚砜(DMSO)与锂离子电化学共嵌入石墨中,形成稳定的三元石墨嵌入化合物(GIC)Li-DMSO-GIC。阐明原位共插行为的细节进行拉曼光谱法以观察电势扫描期间石墨的结构变化。在从2.44 V到1.00 V的扫描过程中,DMSO与锂离子共嵌入石墨中,呈现出阶段性结构。级数从4减少到1。在从1.00到2.44 V的扫描过程中,观察到DMSO溶剂化的锂离子的脱嵌。在经历了2.4和0V之间的电势循环之后,石墨表现出归因于石墨的剥落的显着变化,这意味着石墨复合电极的破坏很可能是由石墨层内的DMSO的分解引起的。

更新日期:2018-01-10
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