Four Phosphonium-based Ionic Liquids. Synthesis, Characterization and Electrochemical Performance as Electrolytes for Silicon Anodes

Author(s)

Sanchez-Ramirez, Nedher ^{[1, 2]} ; Monje, Ivonne E. ^[1] ; Martins, Vitor L. ^{[1, 3]} ; Belanger, Daniel ^{[4, 5]} ; Camargo, Pedro H. C. ^{[6, 1]} ; Torresi, Roberto M. ^[1]

Affiliation

^[1] Univ Sao Paulo, Inst Quim, Dept Quim Fundamental, Ave Prof Lineu Prestes 748, BR-05500000 Sao Paulo - Brazil

^[2] Univ Ingn & Tecnol UTEC, Dept Ciencias, Lima - Peru

^[3] Univ Sao Paulo, Dept Engn Met & Mat, Escola Politecn, Ave Prof Mello Moraes 2463, BR-05508030 Sao Paulo - Brazil

^[4] Univ Quebec Montreal, Dept Chim, Case Postale 8888 Succursale Ctr Ville, Montreal, PQ H3C 3P8 - Canada

^[5] Univ Quebec Montreal, NanoQAM, Case Postale 8888 Succursale Ctr Ville, Montreal, PQ H3C 3P8 - Canada

^[6] Univ Helsinki, Dept Chem, AI Virtasen Aukio 1, Helsinki 00014 - Finland

• Document type: Journal article
• Source: CHEMISTRYSELECT; v. 7, n. 4 JAN 27 2022.
• Web of Science Citations: 0

Abstract

Herein, we describe the synthesis, characterization and electrochemical performance of four phosphonium-based ionic liquids (ILs) as electrolytes, Physicochemical properties such as viscosity, density, ionic conductivity, and thermal stability of ILs and conventional organic solvent ethylene carbonate (EC)/diethyl carbonate (DEC) were experimentally determined at different temperatures. All ILs showed thermal stability greater than 300 degrees C, surpassing the stability of the conventional organic solvent, whose flash points were 145 and 23 degrees C for EC and DEC, respectively. Nevertheless, at room temperature, all ILs are much more viscous than EC/DEC. The composite Si -{[}P-2224]{[}FSI] (triethyl-n-butylphosphonium bis(fluoromethylsulfonyl)imide) and Si-EC/DEC anodes exhibit initial specific capacities at 0.15 A/g of 2409 and 2631 mAh/g, respectively. This demonstrates that despite the inferior transport properties of ILs, short alkyl-substituted phosphonium ILs like {[}P-2224]{[}FSI] are potentially competitive for the new generation of electrolytes for LIBs. NMR, DSC, TGA, and galvanostatic discharged/charged were used as characterization techniques. (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: 20/08553-2 - Computational spectroscopy of diatomic molecules
• Grantee: Antonio Gustavo Sampaio de Oliveira Filho
• Support Opportunities: Regular Research Grants
• FAPESP's process: 19/26309-4 - Beyond Li-ion: development of reversible non-aqueous metal-air batteries
• Grantee: Vitor Leite Martins
• Support Opportunities: Research Grants - Young Investigators Grants
• FAPESP's process: 19/07638-7 - Surface modification of cathodes for lithium ion batteries: electrode/electrolyte interface studies
• Grantee: Ivonne Eliana Monje López
• Support Opportunities: Scholarships abroad - Research Internship - Post-doctor
• FAPESP's process: 17/20043-7 - Nanoparticles for the formation of porous silicon and as conductive additives for anode in Lithium Ion Batteries
• Grantee: Ivonne Eliana Monje López
• Support Opportunities: Scholarships in Brazil - Post-Doctoral
• FAPESP's process: 15/11164-0 - Study of lithiation of silicon nanopowder produced by induced plasma using ionic liquids as electrolytes
• Grantee: Nédher Sánches Ramírez
• Support Opportunities: Scholarships abroad - Research Internship - Post-doctor
• FAPESP's process: 15/26308-7 - Optimization of the physicochemical properties of nano -structured materials for applications in molecular recognition, catalysis and energy conversion/storage
• Grantee: Roberto Manuel Torresi
• Support Opportunities: Research Projects - Thematic Grants
• FAPESP's process: 21/07297-5 - Beyond Li-ion: development of reversible non-aqueous metal-air batteries
• Grantee: Vitor Leite Martins
• Support Opportunities: Scholarships in Brazil - Young Researchers