Physicochemical Properties of Three Ionic Liquids Containing a Tetracyanoborate Anion and Their Lithium Salt Mixtures

Autor(es)

Sanchez-Ramirez, Nedher ^[1] ; Martins, Vitor L. ^[1] ; Ando, Romulo A. ^[1] ; Camilo, Fernanda F. ^[2] ; Urahata, Sergio M. ^[3] ; Ribeiro, Mauro C. C. ^[1] ; Torresi, Roberto M. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Inst Quim, BR-05513970 Sao Paulo - Brazil

^[2] Univ Fed Sao Paulo, Inst Ciencias Ambientais Quim & Farmaceut, BR-09913030 Diadema, SP - Brazil

^[3] Univ Sao Paulo, Inst Fis, BR-05513970 Sao Paulo - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Journal of Physical Chemistry B; v. 118, n. 29, p. 8772-8781, JUL 24 2014.
• Citações Web of Science: 18

Resumo

Given their relevant physicochemical properties, ionic liquids (ILs) are attracting great attention as electrolytes for use in different electrochemical devices, such as capacitors, sensors, and lithium ion batteries. In addition to the advantages of using ILs containing lithium cations as electrolytes in lithium ion batteries, the Li+ transport in ILs containing the most common anion, bis(trilluoromethanesulfonyl) imide anion ({[}Tf2N]), is reportedly small; therefore, its contribution to the overall conductivity is also low. In this work, we describe the preparation and characterization of two new and one known IL containing the tetracyanoborate anion ({[}B(CN)(4)]) as the anionic species. These ILs have high thermal and chemical stabilities, with almost twice the ionic conductivity of the {[}Tf2N] ILs and, most importantly, provide a greater role for the Li+ ion throughout the conductivity process. The experimental ionic conductivity and self-diffusion coefficient data show that the {[}B(CN)(4)]-based Its and their Li+ mixtures have a higher number of charge carriers. Molecular dynamics simulations showed a weaker interaction between Li+ and {[}B(CN)(4)] than that with {[}Tf2N]. These results may stimulate new applications for ILs that have good Li+ transport properties. (AU)

• Processo FAPESP: 09/53199-3 - Reconhecimento molecular e armazenamento de energia: estudos fundamentais do efeito de geometria, tamanho e síntese na otimização das propriedades químicas de materiais eletroativos
• Beneficiário: Roberto Manuel Torresi
• Modalidade de apoio: Auxílio à Pesquisa - Temático
• Processo FAPESP: 13/22748-7 - Desenvolvimento de Capacitores Eletroquímicos de Alto Desempenho, Baseado em Grafeno e Líquidos Iônicos.
• Beneficiário: Vitor Leite Martins
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 10/08646-9 - Síntese e caracterização de Líquidos iônicos baseados em cátions quaternários de fosfônio
• Beneficiário: Nédher Sánches Ramírez
• Modalidade de apoio: Bolsas no Brasil - Doutorado