Nanochannels and nanodroplets in polymer membranes controlling ionic transport

Structure of Diffusion Polymer Membranes for Molecular and Ionic Transport

Journal of Surface Investigation X-ray Synchrotron and Neutron Techniques ◽

10.1134/s1027451021050098 ◽

2021 ◽

Vol 15 (5) ◽

pp. 939-946

Author(s):

V. T. Lebedev ◽

Yu. V. Kulvelis ◽

Gy. Török ◽

O. I. Ivankov ◽

G. A. Polotskaya ◽

...

Keyword(s):

Polymer Membranes ◽

Ionic Transport

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Ionic Transport and Sieving Properties of Sub-nanoporous Polymer Membranes with Tunable Channel Size

ACS Applied Materials & Interfaces ◽

10.1021/acsami.0c22689 ◽

2021 ◽

Vol 13 (7) ◽

pp. 9015-9026

Author(s):

Yaxiong Cheng ◽

Yuhua Dong ◽

Qinggang Huang ◽

Kejing Huang ◽

Shuangbao Lyu ◽

...

Keyword(s):

Polymer Membranes ◽

Ionic Transport ◽

Channel Size

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Schottky diodes as a possible supplementary method for ionic transport investigations in semiconducting ionic solids — application to n-CdF2

Journal de Physique ◽

10.1051/jphys:01983004404055300 ◽

1983 ◽

Vol 44 (4) ◽

pp. 553-558

Author(s):

R.J. Iwanowski ◽

A. Lemańska-Bajorek ◽

J.M. Langer

Keyword(s):

Schottky Diodes ◽

Ionic Transport ◽

Supplementary Method ◽

Ionic Solids

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Emission of Thioflavin T and its Off–On Control in Polymer Membranes‡¶

Photochemistry and Photobiology ◽

10.1562/0031-8655(2001)074<0752:eottai>2.0.co;2 ◽

2001 ◽

Vol 74 (6) ◽

pp. 752 ◽

Cited By ~ 13

Author(s):

C. Retna Raj ◽

R. Ramaraj

Keyword(s):

Polymer Membranes ◽

Thioflavin T

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Exploring the Influence of Substitution on the Structure and Transport Properties in the Sodium Superionic Conductor Na11+xSn2+x(Sb1−yPy)1−xS12

10.26434/chemrxiv.12278237.v1 ◽

2020 ◽

Author(s):

Marvin Kraft ◽

Lara Gronych ◽

Theodosios Famprikis ◽

Saneyuki Ohno ◽

Wolfgang Zeier

Keyword(s):

Electrochemical Impedance ◽

Structural Phase ◽

Ionic Transport ◽

Sodium Ion ◽

Ionic Conductors ◽

Temperature Dependent ◽

Activation Barriers ◽

Rietveld Refinements ◽

High Performing ◽

The Given

Sulfidic sodium ion conductors are currently investigated for the possible use in all-solid-state sodium ion batteries. The design of high performing electrolytes in terms of temperature-dependent ionic transport is based upon the fundamental understanding of structure – transport relationships within the given structural phase boundaries inherent to the investigated materials class. In this work, the Na+ superionic structural family of Na11Sn2PS12 is explored by using the systematic antimony substitution with phosphorous in Na11+xSn2+x(Sb1-yPy)1-xS12. A combination of Rietveld refinements against X-ray synchrotron diffraction data with electrochemical impedance spectroscopy is used to monitor the changes in the anionic framework, the Na+ substructure and the ionic transport. A new simplified descriptor for the average Na+ diffusion pathways, the average Na+ polyhedral volume is introduced, which is used to correlate the contraction of the overall lattice and the found activation barriers in the system. This study exemplifies how substitution affects diffusion pathways in ionic conductors and widens the knowledge about the related structural motifs and their influence on the ionic transport in this novel class of ionic conductors.

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Changing the Static and Dynamic Lattice Effects for the Improvement of the Ionic Transport Properties Within the Argyrodite Li6PS5-xSexI

10.26434/chemrxiv.9807770.v1 ◽

2019 ◽

Author(s):

Roman Schlem ◽

Michael Ghidiu ◽

Sean Culver ◽

Anna-Lena Hansen ◽

Wolfgang Zeier

Keyword(s):

Ionic Conductivity ◽

Activation Barrier ◽

Parent Compound ◽

Ionic Transport ◽

X Ray Diffraction ◽

X Ray ◽

Lattice Effects ◽

Solid State Batteries ◽

All Solid State Batteries ◽

Pulse Echo

The lithium argyrodites Li6PS5X (X = Cl, Br, I) have been gaining momentum as candidates for electrolytes in all-solid-state batteries. While these materials have been well-characterized structurally, the influences of the static and dynamic lattice properties are not fully understood. Recent improvements to the ionic conductivity of Li6PS5I (which as a parent compound is a poor ionic conductor) via elemental substitutions have shown that a multitude of influences affect the ionic transport in the lithium argyrodites, and that even poor conductors in this class have room left for improvement.Here we explore the influence of isoelectronic substitution of sulfur with selenium in Li6PS5-xSexI. Using a combination of X-ray diffraction, impedance spectroscopy, Raman spectroscopy, and pulse-echo speed of sound measurements,we explore the influence of the static and dynamic lattice on the ionic transport. The substitution of S2-with Se2- broadens the diffusion pathways and structural bottlenecks, as well as leading to a softer more polarizable lattice, all of which lower the activation barrier and lead to an increase in the ionic conductivity. This work sheds light on ways to systematically understand and improve the functional properties of this exciting material family.

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Rapid Crystallization and Kinetic Freezing of Site-Disorder in the Lithium Superionic Argyrodite Li6PS5Br

10.26434/chemrxiv.9794588 ◽

2019 ◽

Author(s):

Ajay Gautam ◽

Marcel Sadowski ◽

Nils Prinz ◽

Henrik Eickhoff ◽

Nicolo Minafra ◽

...

Keyword(s):

Elevated Temperatures ◽

Synthesis Method ◽

Reaction Times ◽

Ionic Conductivities ◽

Ionic Transport ◽

High Energy ◽

Superionic Conductors ◽

Rapid Crystallization ◽

Site Disorder ◽

Fast Cooling

Lithium argyrodite superionic conductors are currently being investigated as solid electrolytes for all-solid-state batteries. Recently, in the lithium argyrodite Li6PS5X (X = Cl, Br, I), a site-disorder between the anionsS2–and X–has been observed, which strongly affects the ionic transport and appears to be a function of the halide present. In this work, we show how such disorder in Li6PS5Br can be engineered viathe synthesis method. By comparing fast cooling (i.e. quenching) to more slowly cooled samples, we find that anion site-disorder is higher at elevated temperatures, and that fast cooling can be used to kinetically trap the desired disorder, leading to higher ionic conductivities as shown by impedance spectroscopy in combination with ab-initiomolecular dynamics. Furthermore, we observe that after milling, a crystalline lithium argyrodite can be obtained within one minute of heat treatment. This rapid crystallization highlights the reactive nature of mechanical milling and shows that long reaction times with high energy consumption are not needed in this class of materials. The fact that site-disorder induced viaquenching is beneficial for ionic transport provides an additional approach for the optimization and design of lithium superionic conductors.

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