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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Two phosphonium ionic liquids with high Li+ transport number

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Martins, Vitor L. [1] ; Sanchez-Ramirez, Nedher [1] ; Ribeiro, Mauro C. C. [1] ; Torresi, Roberto M. [1]
Total Authors: 4
[1] Univ Sao Paulo, Inst Quim, BR-05513970 Sao Paulo, SP - Brazil
Total Affiliations: 1
Document type: Journal article
Source: Physical Chemistry Chemical Physics; v. 17, n. 35, p. 23041-23051, 2015.
Web of Science Citations: 20

This work presents the physicochemical characterization of two ionic liquids (ILs) with small phosphonium cations, triethylpenthylphosphonium bis(trifluoromethanesulfonyl)imide ({[}P-2225]{[}Tf2N]) and (2-methoxyethyl)trimethylphosphonium bis(trifluoromethanesulfonyl) imide ({[}P-222(201)]{[}Tf2N]), and their mixtures with Li+. Properties such as the electrochemical window, density, viscosity and ionic conductivity are presented. The diffusion coefficient was obtained using two different techniques, PGSE-NMR and Li electrodeposition with microelectrodes. In addition, the Li+ transport number was calculated using the PGSE-NMR technique and an electrochemical approach. The use of these three techniques showed that the PGSE-NMR technique underestimates the diffusion coefficient for charged species. The Li+ transport number was found to be as high as 0.54. Raman spectroscopy and molecular dynamics simulations were used to evaluate the short-range structure of the liquids. These experiments suggested that the interaction between the Li+ and the Tf2N- anion is similar to that seen with other ILs containing the same anion. However, the MD simulations also showed that the Li+ ions interact differently with the cation containing an alkyl ether chain. The results found in this work suggest that these Li+ mixtures have promising potential to be applied as electrolytes in batteries. (AU)

FAPESP's process: 13/22748-7 - Development of High Performance Electrochemical Capacitors Based on Graphene and Ionic Liquids.
Grantee:Vitor Leite Martins
Support type: Scholarships in Brazil - Post-Doctorate
FAPESP's process: 14/01987-6 - Study of lithium intercalation into different nanostructured cathode based on oxides of transition metal using ionic liquid (ILs) with low viscosity synthesized from phosphonium and tetracyanoborate like electrolytes.
Grantee:Nédher Sánches Ramírez
Support type: Scholarships in Brazil - Post-Doctorate
FAPESP's process: 09/53199-3 - Molecular recognition and energy storage: fundamental studies concerning geometry, size and synthesis effects on the optimization of the chemical properties of electroactive materials
Grantee:Roberto Manuel Torresi
Support type: Research Projects - Thematic Grants
FAPESP's process: 10/08646-9 - Synthesis and characterization of ionic liquids based in phosphonium quaternary cations
Grantee:Nédher Sánches Ramírez
Support type: Scholarships in Brazil - Doctorate