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Journal of Solid State Electrochemistry

, Volume 16, Issue 10, pp 3391–3397

First Online: 08 June 2012Received: 13 April 2012Revised: 17 May 2012Accepted: 23 May 2012

Abstract

Solutions of three salts LiBF4, LiNTf2, LiPF6 in N-methyl-2-pyrrolidone NMP, selected arbitrarily as a reference solvent, were investigated by electrochemical impedance spectroscopy EIS and scanning electron microscopy techniques. The lithium surface in contact with LiPF6 in NMP electrolyte was covered with a protective layer SEI which morphology comprise small particles of ca. 0.2 μm in radius. This salt was selected for further studies. The impedance of the Li|LiPF6 in NMP + additive|Li system was measured immediately after cell assembly and after galvanostatic charging-discharging. Fifteen different additives 10 wt.% were used. The efficiency of individual additives was evaluated in terms of the Li|electrolyte system resistance ΔR or total cell impedance reduction, both deduced from EIS. Some of the additives were able to form the SEI layer and to reduce resistance-impedance of the Li|electrolyte interphase. In such cases, the lithium surface was covered with relatively uniform conglomerates, or regions separated by cracks, of ca. 1–2 μm in dimension.

KeywordsLithium SEI Electrolyte additive EIS  Download fulltext PDF



Author: Andrzej Lewandowski - Agnieszka Swiderska-Mocek - Lukasz Waliszewski

Source: https://link.springer.com/







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