Oriented Crystal Growth of La0.557Li0.330TiO3 in Bulk Ceramics Induced by LaAlO3 Single-Crystal Fibers

Autor(es)

Wang, Tao ; de Oliveira, Rafael B. ; Andreeta, Marcello R. B. ; Wang, Haoyuan ; Jia, Zhitai ; Tao, Xutang

• Tipo de documento: Artigo Científico
• Fonte: Crystal Growth & Design; v. 21, n. 4, p. 8-pg., 2021-01-26.

Resumo

Perovskite La0.557Li0.330TiO3 (LLTO) has been considered as one of the most promising solid-state electrolytes for lithium-ion batteries because of its high bulk ionic conductivity at room temperature (similar to 10(-3) S/cm). However, the full potential of this compound, as a ceramic electrolyte, is limited by the low ionic conductivity of the grain boundary (<10(-5) S/cm). One way to avoid the grain boundary barrier is to introduce LLTO crystals connecting the two electrodes. In this work, using LaAlO3 (LAO) single-crystal fibers as seeds, the conditions for oriented crystal growth of the LLTO compound, inside a bulk ceramic, are presented and discussed for different crystallographic directions ([100], [110], and [111]). The relationship between the LLTO crystal region and sintering parameters was investigated in detail, and a maximum growth rate was obtained using a [111]-oriented LAO single-crystal fiber. It is also shown that anisotropic epitaxial growth behaviors of LLTO crystals, in the LLTO/LAO composites, could be explained by morphological analysis and DFT simulations. The successful implementation of controllable LLTO crystal growth provides a feasible design for new solid-state electrolytes. (AU)

• 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
• Processo FAPESP: 16/04788-0 - EMU concedido no processo 2013/07793-6: equipamento espectrômetro de raios-X fluorescente, modelo ZSX Primus II
• Beneficiário: Edgar Dutra Zanotto
• Modalidade de apoio: Auxílio à Pesquisa - Programa Equipamentos Multiusuários
• 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