In-situ Optical Microscope Morphology Observation of Lithium Electrodeposited in Room Temperature Ionic Liquids Containing Aliphatic Quaternary Ammonium Cation

Hikaru SANO; Hikari SAKAEBE; Hajime MATSUMOTO

doi:10.5796/electrochemistry.80.777

Communications

In-situ Optical Microscope Morphology Observation of Lithium Electrodeposited in Room Temperature Ionic Liquids Containing Aliphatic Quaternary Ammonium Cation

Hikaru SANO, Hikari SAKAEBE, Hajime MATSUMOTO

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Keywords: Lithium Metal Anode, Dendrite, Room Temperature Ionic Liquids, In-situ Optical Microscope Observation

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2012 Volume 80 Issue 10 Pages 777-779

DOI https://doi.org/10.5796/electrochemistry.80.777

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Abstract

The behavior of lithium (Li) electrodeposition in room temperature ionic liquids (RTILs) containing aliphatic quaternary ammonium cation was investigated by in-situ optical microscope observation. As a result, round shape Li deposits were obtained after deposition in all cases with vinylene carbonate (VC) as an additive, while most deposits were dendritic without VC. AC impedance spectroscopic measurements indicated that the dendrite growth was suppressed when a surface film with large resistance was generated. The dendrite suppression effect by VC addition was confirmed in the Py14[TFSA]-based and TMHA[TFSA]-based electrolytes as well as in the PP13[TFSA]-based electrolyte.

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