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  Fast Sodium-Ion Conductivity in Supertetrahedral Phosphidosilicates

Haffner, A., Hatz, A., Moudrakovski, I., Lotsch, B. V., & Johrendt, D. (2018). Fast Sodium-Ion Conductivity in Supertetrahedral Phosphidosilicates. Angewandte Chemie International Edition, 57(21), 6155-6160.

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 Creators:
Haffner, A., Author
Hatz, A., Author
Moudrakovski, I., Author
Lotsch, B. V.1, Author           
Johrendt, D., Author
Affiliations:
1Department Nanochemistry (Bettina V. Lotsch), Max Planck Institute for Solid State Research, Max Planck Society, ou_3370482              

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Free keywords: crystal structures; ion conductivity; phosphidosilicates; sodium; supertetrahedra
 Abstract: Fast sodium-ion conductors are key components of Na-based all-solid-state batteries which hold promise for large-scale storage of electrical power. We report the synthesis, crystal-structure determination, and Na+-ion conductivities of six new Na-ion conductors, the phosphidosilicates Na19Si13P25, Na23Si19P33, Na23Si28P45, Na23Si37P57, LT-NaSi2P3 and HT-NaSi2P3, based entirely on earth-abundant elements. They have SiP4 tetrahedra assembled interpenetrating networks of T3 to T5 supertetrahedral clusters and can be hierarchically assigned to sphalerite- or diamond-type structures. Na-23 solid-state NMR spectra and geometrical pathway analysis show Na+-ion mobility between the supertetrahedral cluster networks. Electrochemical impedance spectroscopy shows Na+-ion conductivities up to sigma(Na+) = 4 x 10(-4) Scm(-1). The conductivities increase with the size of the supertetrahedral clusters through dilution of Na+-ions as the charge density of the anionic networks decreases.

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Language(s): eng - English
 Dates: 2018
 Publication Status: Issued
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: eDoc: 744621
ISI: 000432710100029
 Degree: -

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Title: Angewandte Chemie International Edition
Source Genre: Journal
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Publ. Info: WEINHEIM : WILEY-V C H VERLAG GMBH
Pages: - Volume / Issue: 57 (21) Sequence Number: - Start / End Page: 6155 - 6160 Identifier: ISSN: 1433-7851