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Title: Structural and Na-ion conduction characteristics of Na 3 PS x Se 4-x

Journal Article · · Journal of Materials Chemistry. A
DOI:https://doi.org/10.1039/C6TA03027K· OSTI ID:1324782

The recent discovery of the isostructrual cubic Na3PS4 and Na3PSe4 as fast Na-ion conductors provided a general structural framework for the exploration of new sodium superionic conductors. In this work, we systematically investigated the structures and ionic conduction characteristics of a series of compounds with the general chemical formula of Na3PSxSe4-x. Synthesis of Na3PS4 under different conditions (e.g., temperature, reaction vessel, mass of the precursors) reveals the reactivity of the precursors with the reaction tubes, producing different polymorphs. X-ray diffraction studies on the solid solution phases Na3PSxSe4-x identified a tetragonal-to-cubic phase transition with increasing Se concentration. This observation is consistent with the computed stability of the tetragonal and cubic polymorphs, where the energy difference between the two polymorphs becomes very close to zero in Se-rich compositions. Furthermore, ab initio molecular dynamic simulations suggest that the fast Na-ion conduction in Na3PSxSe4-x may not be causally related with the symmetry or the composition of these phases. The formation of defects, instead, enables fast Na-ion conduction in this class of materials.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Organization:
USDOE
OSTI ID:
1324782
Journal Information:
Journal of Materials Chemistry. A, Vol. 4, Issue 23; ISSN 2050-7488
Publisher:
Royal Society of Chemistry
Country of Publication:
United States
Language:
ENGLISH

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Cited By (12)

Studies of Functional Defects for Fast Na-Ion Conduction in Na 3− y PS 4− x Cl x with a Combined Experimental and Computational Approach journal January 2019
High‐Performance Li–SeS x All‐Solid‐State Lithium Batteries journal March 2019
Computational Studies of Electrode Materials in Sodium-Ion Batteries journal March 2018
Solid-State Sodium Batteries journal February 2018
Sodium-Ion Battery Electrolytes: Modeling and Simulations journal February 2018
Recent Research on Strategies to Improve Ion Conduction in Alkali Metal‐Ion Batteries journal April 2019
Ionic Conductivity of the NASICON‐Related Thiophosphate Na 1+ x Ti 2− x Ga x (PS 4 ) 3 journal February 2019
Fundamentals of inorganic solid-state electrolytes for batteries journal August 2019
Room-Temperature All-solid-state Rechargeable Sodium-ion Batteries with a Cl-doped Na3PS4 Superionic Conductor journal September 2016
Enhancing sodium ionic conductivity in tetragonal-Na 3 PS 4 by halogen doping: a first principles investigation journal January 2018
Mechanochemical synthesis of fast sodium ion conductor Na 11 Sn 2 PSe 12 enables first sodium–selenium all-solid-state battery journal January 2019
Building Better Batteries in the Solid State: A Review journal November 2019

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