Template-free hydrothermal synthesis of lithium iron tavorite with complex morphologies driven by phase transformation

• Autor(a) principal: Ferdov, S.
• Data de Publicação: 2022
• Outros Autores: Gonçalves, Renato Ferreira, Fidalgo-Marijuan, Arkaitz, Costa, Carlos Miguel Silva, Lanceros-Méndez, S.
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
• Texto Completo: https://hdl.handle.net/1822/82087
• topic: Tavorite; Template-free synthesis; Phase transformation; Core-shell; Hollow structure; Morphology control

Materials science is increasingly relying on sustainable methods for synthesis of advanced materials. This work demonstrates the first template-free approach for the crystallization of tavorite, LiFePO4(OH), in the form of hollow microspheres and unique core (single crystal) –shell (aggregated particles) cross-like dendrites. The different morphologies have been obtained by hydrothermal synthesis. The kinetic pathways of crystallization reveal how the transformation of two different thermodynamically unstable phases, such as giniite (Fe5(PO4)4(OH)2∙2H2O) and Lithium sulfate (Li2SO4), leads to the same tavorite structure but with different morphologies based on the different mechanisms for crystal growth. Additionally, we provide standardized powder X-ray diffraction data and insights into the influence of the iron precursor on the crystal morphology of tavorite.