Journal article

Publication year: 2018

Pages: 6440-6448

Journal: Chemistry of Materials

Volume number: 30

Issue number: 18

ISSN: 0897-4756

eISSN: 1520-5002

DOI Link: https://doi.org/10.1021/acs.chemmater.8b02759

Publisher: American Chemical Society

Abstract: 
To utilize all-solid-state batteries as high power and energy density energy storage devices it is necessary to improve the current electrolyte materials and the cell architecture. In this work, we present alpha- and beta-Li8GeP4 as potential compounds for the use in cathode composites of solid-state batteries because of their ability to conduct both Li+ ion and electrons. Each polymorph was synthesized via mechanical alloying of the elements and subsequent annealing. Structural analysis of a- and beta-Li(8)GeP(4 )via X-ray diffraction reveals isolated [GeP4](8-) tetrahedra. alpha-Li8GeP4 (Pa (3) over bar) and beta-Li8GeP4 (P (4) over bar 3n) are isotypic with Li8SiP4 and Li8SnP4, respectively. The lithium ion mobility indicated by partially filled octahedral voids was investigated by temperature-dependent nuclear magnetic resonance and electrochemical impedance spectroscopy and reveals low activation energies for lithium hopping in the range from 34 and 42 kJ mol(-1) as well as high ionic conductivities of up to 8 X 10(-5) S cm(-1) and electronic conductivities of up to 4 X 10(-7) S cm(-1) at 293 K. These results combine a new substance class with a systematic synthesis approach for materials with high ionic carrier densities.

Harvard Citation style: Eickhoff, H., Strangmueller, S., Klein, W., Kirchhain, H., Dietrich, C., Zeier, W., et al. (2018) Lithium Phosphidogermanates α- and β-Li₈GeP₄-A Novel Compound Class with Mixed Li⁺ Ionic and Electronic Conductivity, Chemistry of Materials, 30(18), pp. 6440-6448. https://doi.org/10.1021/acs.chemmater.8b02759

APA Citation style: Eickhoff, H., Strangmueller, S., Klein, W., Kirchhain, H., Dietrich, C., Zeier, W., van Wuellen, L., & Faessler, T. (2018). Lithium Phosphidogermanates α- and β-Li₈GeP₄-A Novel Compound Class with Mixed Li⁺ Ionic and Electronic Conductivity. Chemistry of Materials. 30(18), 6440-6448. https://doi.org/10.1021/acs.chemmater.8b02759