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Synthesis, Crystal Structure, and Stability of Cubic Li7-xLa3Zr2-xBixO12.


ABSTRACT: Li oxide garnets are among the most promising candidates for solid-state electrolytes in novel Li ion and Li metal based battery concepts. Cubic Li7La3Zr2O12 stabilized by a partial substitution of Zr4+ by Bi5+ has not been the focus of research yet, despite the fact that Bi5+ would be a cost-effective alternative to other stabilizing cations such as Nb5+ and Ta5+. In this study, Li7-xLa3Zr2-xBixO12 (x = 0.10, 0.20, ..., 1.00) was prepared by a low-temperature solid-state synthesis route. The samples have been characterized by a rich portfolio of techniques, including scanning electron microscopy, X-ray powder diffraction, neutron powder diffraction, Raman spectroscopy, and 7Li NMR spectroscopy. Pure-phase cubic garnet samples were obtained for x ? 0.20. The introduction of Bi5+ leads to an increase in the unit-cell parameters. Samples are sensitive to air, which causes the formation of LiOH and Li2CO3 and the protonation of the garnet phase, leading to a further increase in the unit-cell parameters. The incorporation of Bi5+ on the octahedral 16a site was confirmed by Raman spectroscopy. 7Li NMR spectroscopy shows that fast Li ion dynamics are only observed for samples with high Bi5+ contents.

SUBMITTER: Wagner R 

PROVIDER: S-EPMC5141546 | biostudies-literature | 2016 Dec

REPOSITORIES: biostudies-literature

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Synthesis, Crystal Structure, and Stability of Cubic Li<sub>7-x</sub>La<sub>3</sub>Zr<sub>2-x</sub>Bi<sub>x</sub>O<sub>12</sub>.

Wagner Reinhard R   Rettenwander Daniel D   Redhammer Günther J GJ   Tippelt Gerold G   Sabathi Gebhard G   Musso Maurizio E ME   Stanje Bernhard B   Wilkening Martin M   Suard Emmanuelle E   Amthauer Georg G  

Inorganic chemistry 20161115 23


Li oxide garnets are among the most promising candidates for solid-state electrolytes in novel Li ion and Li metal based battery concepts. Cubic Li<sub>7</sub>La<sub>3</sub>Zr<sub>2</sub>O<sub>12</sub> stabilized by a partial substitution of Zr<sup>4+</sup> by Bi<sup>5+</sup> has not been the focus of research yet, despite the fact that Bi<sup>5+</sup> would be a cost-effective alternative to other stabilizing cations such as Nb<sup>5+</sup> and Ta<sup>5+</sup>. In this study, Li<sub>7-x</sub>La  ...[more]

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