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Fast Sodium-Ion Conductivity in Supertetrahedral Phosphidosilicates
Arthur Haffner1, Anna-Katharina Hatz2, Igor Moudrakovski2
1Department of Chemistry, Ludwig-Maximilians-Universität München, Butenandtstrasse 5-13 (D), 81377, München, Germany.
Angewandte Chemie (International Ed. in English)
|April 4, 2018
Summary
New phosphidosilicate materials exhibit fast sodium-ion conductivity, crucial for developing earth-abundant sodium-ion batteries for large-scale energy storage.
Area of Science:
- Materials Science
- Solid-State Chemistry
- Electrochemistry
Background:
- Fast ion conductors are essential for Na-based all-solid-state batteries.
- These batteries offer potential for large-scale electrical energy storage.
Purpose of the Study:
- To synthesize and characterize novel sodium-ion conductors.
- To investigate their crystal structure and ionic conductivity.
Main Methods:
- Synthesis and crystal-structure determination of six phosphidosilicates.
- 23Na solid-state NMR and geometrical pathway analysis for ion mobility.
- Electrochemical impedance spectroscopy for conductivity measurements.
Main Results:
- Six new Na-ion conductors (Na19Si13P25, Na23Si19P33, Na23Si28P45, Na23Si37P57, LT-NaSi2P3, HT-NaSi2P3) were synthesized.
- Materials feature interpenetrating networks of SiP4 supertetrahedral clusters.
- Achieved Na+ ion conductivities up to 4x10^-4 S/cm.
- Conductivity correlates with supertetrahedral cluster size and decreased charge density.
Conclusions:
- The synthesized phosphidosilicates are promising fast sodium-ion conductors.
- Ion mobility occurs between supertetrahedral cluster networks.
- Conductivity enhancement is linked to structural and electronic properties.
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