Innovative Design for the Enhancement of Lithium Lanthanum Titanate Electrolytes

Autor(es)

de Oliveira, Rafael B. ^[1] ; Andreeta, Marcello R. B. ^[1] ; de Souza, Dulcina M. P. F. ^[1] ; Rodrigues, Joao E. F. S. ^[2] ; Pizani, Paulo S. ^[2]

Afiliação do(s) autor(es)

^[1] Univ Fed Sao Carlos, Dept Mat Engn, Washington Luis Rd SP 310, Km 235, BR-13565905 Sao Paulo - Brazil

^[2] Univ Fed Sao Carlos, Dept Phys, Washington Luis Rd SP 310, Km 235, BR-13565905 Sao Paulo - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Crystal Growth & Design; v. 19, n. 9, p. 4897-4901, SEP 2019.
• Citações Web of Science: 0

Resumo

The high ionic conductivity in lithium lanthanum titanate perovskite ceramics, Li3xLa(2/3),TiO3(LLTO), is well-known for the x approximate to 0.11 lithium concentration. The grain conductivity is approximately 10 -3 S.cm(-1) at room temperature, which makes this compound one of the best candidates for the development of solid-state electrolytes. However, lower grain boundary conductivity (10(-6) to 10(-4) S.cm(-1)) blocks lithium diffusion. In order to increase the total conductivity of LLTO ceramics, single crystal fibers of lanthanum aluminate (LAO) were inserted into its green ceramic matrix. Our hypothesis is that single crystal fibers are capable of inducting LLTO abnormal grain growth, thus improving the overall electrical conductivity of the composite. The results show that LAO single crystals act like seeds, creating abnormal grain growth at the LaAlO3 fiber surface. The impedance spectroscopy shows that the new composites have a substantial relative enhancement of total ionic conductivity (more than 200%) in comparison with the monolithic ceramic samples. This result shows the possibility of developing a novel composite design as a candidate for solid electrolyte applications. (AU)

• Processo FAPESP: 13/17071-8 - Implantação da técnica de crescimento de cristais via fusão a laser e a preparação de cristais com concentração zonal eutética para aplicações em procedimentos cirúrgicos
• Beneficiário: Marcello Rubens Barsi Andreeta
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 13/07793-6 - CEPIV - Centro de Ensino, Pesquisa e Inovação em Vidros
• Beneficiário: Edgar Dutra Zanotto
• Modalidade de apoio: Auxílio à Pesquisa - Centros de Pesquisa, Inovação e Difusão - CEPIDs