| Full text | |
| Author(s): |
Martins, Vitor L.
[1]
;
Sanchez-Ramirez, Nedher
[1]
;
Ribeiro, Mauro C. C.
[1]
;
Torresi, Roberto M.
[1]
Total Authors: 4
|
| Affiliation: | [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 |
| Abstract | |
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: | 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 Opportunities: | Scholarships in Brazil - Post-Doctoral |
| 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 Opportunities: | Research Projects - Thematic Grants |
| FAPESP's process: | 13/22748-7 - Development of High Performance Electrochemical Capacitors Based on Graphene and Ionic Liquids. |
| Grantee: | Vitor Leite Martins |
| Support Opportunities: | Scholarships in Brazil - Post-Doctoral |
| FAPESP's process: | 10/08646-9 - Synthesis and characterization of ionic liquids based in phosphonium quaternary cations |
| Grantee: | Nédher Sánches Ramírez |
| Support Opportunities: | Scholarships in Brazil - Doctorate |