Electrochemical study of anatase TiO2 nanotube array electrode in electrolyte based on 1,3-diethylimidazolium bis(trifluoromethylsulfonyl)imide ionic liquid

Abstract

The density, viscosity and electrical conductivity of ionic liquid 1,3-diethylimidazolium bis(trifluoromethylsulfonyl)imide, (C 2 C 2 imTFSI), and 0.5-M solution of LiTFSI in C 2 C 2 imTFSI were determined at different temperatures. The LiTFSI/C 2 C 2 imTFSI system was tested as a possible electrolyte for lithium-ion batteries by using anatase TiO 2 nanotube array electrode as anode material for the first time. The electrochemical testing has shown not only the improvement of lithium-ion insertion/deinsertion properties by increasing temperature but also the existence of a decomposition of the electrolyte, detecting the change of colour. The decomposition of electrolyte leads to the formation of a film on the surface of the electrode which improves Coulombic efficiency during cycling.

Effect of Zwitterionic Additive on Electrode Protection through Electrochemical Performances of Anatase TiO2 Nanotube Array Electrode in Ionic Liquid Electrolyte

“…A flame did not appear during 120 s of heating, which indicates that the LiTFSI/C 2 C 2 imTFSI/C 1 C 4 imSO 3 electrolyte is nonflammable ( Figure S1 ). The flammability of the electrolyte with same concentration of lithium salt in ionic liquid electrolyte was investigated in a previous publication [ 28 ].…”

“…Current demands for LIB electrolytes include developing electrolytes containing components that synchronously achieve different functions, such as electrolyte stabilization towards the electrode materials and electrode functionalization [ 26 , 27 , 28 , 29 , 30 ]. As a result, the knowledge based on ionic liquids induced the synthesis of novel families of compounds established on them—the zwitterionic compounds, because it is assumed that there is a possibility of a stabilization effect towards the electrode [ 31 , 32 , 33 , 34 , 35 , 36 , 37 , 38 ].…”

“…The electrochemical testing was conducted to compare the stability of the electrolyte studied in this work with that in a previous study [ 28 ], which did not contained the zwitterionic compound C 1 C 4 imSO 3 as an additive. In comparison with their IL counterparts, the present ZI had a more polar character, suggesting that this compound may become attractive in battery electrolytes.…”

Theory-augmented informatics of ionic liquid electrolytes for co-design with nanoporous electrode materials

“…The first set of peaks in Fig. 3 [47][48][49] Based on our FOM, this set of alternative RTILs can provide good performance in these intermediate pore sizes, whereas the more common [EMIm] +and [BMIm] + -based RTILs may be less effective.…”

“…These are not heavily represented in experimental EES literature, yet they have been cited as promising candidates for electrochemical applications due to their large ESWs and high(low) ionic conductivities(viscosities). 47–49 Based on our FOM, this set of alternative RTILs can provide good performance in these intermediate pore sizes, whereas the more common [EMIm] + – and [BMIm] + –based RTILs may be less effective.…”