A new class of lithium ion conductors with tunable structures and compositions: Quaternary diamond-like thiogermanates

A new class of lithium ion conductors with tunable structures and compositions: Quaternary... The new Li2CoGeS4 compound crystallizes in the Pn space group with the wurtz-kesterite structure, according to single crystal X-ray diffraction. The structure of Li2CoGeS4 and the high degree of phase-purity in which it is prepared are supported by high-resolution synchrotron X-ray powder diffraction. Varying the divalent ion in Li2-II-GeS4 materials yields three different structure types, all of which are derived from hexagonal diamond. These structural variations give rise to Li+-encompassing [II–GeS4]2− nets with different topologies that offer diversity in lithium ion diffusion pathways. In the first systematic study of the lithium ion conductivity in quaternary diamond-like materials, wurtz-kesterite-type Li2CoGeS4 and Li2FeGeS4 (Pn), lithium cobalt(II) silicate-type Li2MnGeS4 (Pna21), and wurtz-stannite-type Li2CdGeS4 (Pmn21) are presented as environmentally stable lithium ion conductors. These materials are comprised of cubic diamond-like [CoGeS4]2− and [FeGeS4]2− anionic frameworks, ABW-like [MnGeS4]2−, and square lattice-like [CdGeS4]2−. As assessed using impedance spectroscopy, Li2FeGeS4 exhibits the most promising Li+ ion conductivity of 1.8(3)×10−4S/cm at 100°C, while Li2CdGeS4 shows the lowest activation energy for lithium ion conduction, EA=0.74(2)eV. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Solid State Ionics Elsevier

A new class of lithium ion conductors with tunable structures and compositions: Quaternary diamond-like thiogermanates

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Publisher
Elsevier
Copyright
Copyright © 2015 Elsevier B.V.
ISSN
0167-2738
eISSN
1872-7689
D.O.I.
10.1016/j.ssi.2015.05.019
Publisher site
See Article on Publisher Site

Abstract

The new Li2CoGeS4 compound crystallizes in the Pn space group with the wurtz-kesterite structure, according to single crystal X-ray diffraction. The structure of Li2CoGeS4 and the high degree of phase-purity in which it is prepared are supported by high-resolution synchrotron X-ray powder diffraction. Varying the divalent ion in Li2-II-GeS4 materials yields three different structure types, all of which are derived from hexagonal diamond. These structural variations give rise to Li+-encompassing [II–GeS4]2− nets with different topologies that offer diversity in lithium ion diffusion pathways. In the first systematic study of the lithium ion conductivity in quaternary diamond-like materials, wurtz-kesterite-type Li2CoGeS4 and Li2FeGeS4 (Pn), lithium cobalt(II) silicate-type Li2MnGeS4 (Pna21), and wurtz-stannite-type Li2CdGeS4 (Pmn21) are presented as environmentally stable lithium ion conductors. These materials are comprised of cubic diamond-like [CoGeS4]2− and [FeGeS4]2− anionic frameworks, ABW-like [MnGeS4]2−, and square lattice-like [CdGeS4]2−. As assessed using impedance spectroscopy, Li2FeGeS4 exhibits the most promising Li+ ion conductivity of 1.8(3)×10−4S/cm at 100°C, while Li2CdGeS4 shows the lowest activation energy for lithium ion conduction, EA=0.74(2)eV.

Journal

Solid State IonicsElsevier

Published: Oct 1, 2015

References

  • Inorg. Chem.
    Lekse, J.W.; Moreau, M.A.; McNerny, K.L.; Yeon, J.; Halasyamani, P.S.; Aitken, J.A.; Brant, J.A.; Clark, D.J.; Kim, Y.S.; Jang, J.I.; Zhang, J.-H.; Aitken, J.A.; Jang, J.I.; Clark, D.J.; Brant, J.A.; Aitken, J.A.; Kim, Y.S.; Rosmus, K.A.; Brant, J.A.; Wisneski, S.D.; Clark, D.J.; Kim, Y.S.; Jang, J.I.; Brunetta, C.D.; Zhang, J.-H.; Srnec, M.N.; Aitken, J.A.; Aitken, J.A.; Brant, J.A.; Clark, D.J.; Kim, Y.S.; Jang, J.I.
  • Solid State Ionics
    Kanno, R.; Hata, T.; Kawamoto, Y.; Irie, M.

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