Enhancing ionic conductivity of glass-type electrolyte by strategically increasing the concentration of charge carrier

AbstractFast-ion conduction in solids is considered a paradigm for structure-property relation where ionic conductivity σ = nqµ, n the concentration of charge carrier q, and µ. the mobility of the carrier. The critical conductivity determining factor, ceteris paribus, is the carrier mobility which depends on the geometry of anion array and structure in the solid. Factors inherent in the structural framework include “free” volume, “bottleneck” size, lattice disorder, etc. Other non-structural factors that can play a vital role, even a dominant role, in enhancing ionic conductivity are charge carrier concentration, ion-ion interactions or bonding characteristics, vibrational amplitudes of neighboring ions, lattice compressibility or resiliency, rotational motion of anions, ion size, etc. Many aspects of these factors will be examined in the light of recent studies and the results on some isostructural and isomorphous sulfates and other related structures to evaluate their relative contributions.

Download Full-text

Perovskite-Type Electrolyte for Ceramic Lithium Batteries: Enhanced Microstructure and Bulk Ionic Conductivity

ECS Meeting Abstracts ◽

10.1149/ma2021-014257mtgabs ◽

2021 ◽

Vol MA2021-01 (4) ◽

pp. 257-257

Author(s):

Shuo Yan ◽

Ali Merati ◽

Yaser Abu-Lebdeh ◽

Vladimir Pankov ◽

Chae-Ho Yim ◽

...

Keyword(s):

Ionic Conductivity ◽

Lithium Batteries ◽

Perovskite Type ◽

Type Electrolyte

Download Full-text

Dense garnet-type electrolyte with coarse grains for improved air stability and ionic conductivity

Journal of Energy Storage ◽

10.1016/j.est.2019.101128 ◽

2020 ◽

Vol 27 ◽

pp. 101128 ◽

Cited By ~ 5

Author(s):

Xiaomei Zeng ◽

Andrew J. Martinolich ◽

Kimberly A. See ◽

Katherine T. Faber

Keyword(s):

Ionic Conductivity ◽

Coarse Grains ◽

Type Electrolyte

Download Full-text

Conductivity mechanism in ionic 2D carbon nitrides: from hydrated ion motion to enhanced photocatalysis

10.33774/chemrxiv-2021-zb25v ◽

2021 ◽

Author(s):

Julia Kröger ◽

Filip Podjaski ◽

Gökçen Savaşçı ◽

Igor Moudrakovski ◽

Alberto Jimenez-Solano ◽

...

Keyword(s):

Photocatalytic Activity ◽

Ionic Conductivity ◽

Charge Carrier ◽

Pore Channel ◽

Ion Motion ◽

Carrier Lifetimes ◽

Carbon Nitrides ◽

Efficient Charge ◽

Mobile Ions ◽

Hydrated Ion

Carbon nitrides are among the most studied materials for photocatalysis, however, limitations arise from inefficient charge separation and transport within the material. Here, this aspect is addressed in the 2D carbon nitride poly(heptazine imide) (PHI) by investigating the influence of various counterions, such as M = Li+, Na+, K+, Cs+, Ba2+, NH4+ and tetramethyl ammonium, on the material’s conductivity and photocatalytic activity. These ions in the PHI pores affect the stacking of the 2D layers, which further influences the predominantly ionic conductivity in M-PHI. Na-containing PHI outperforms the other M-PHI in various relative humidity (RH) environments (0-42 %RH) in terms of conductivity, likely due to pore channel geometry and size of the (hydrated) ion. With increasing RH, the ionic conductivity increases by 4-5 orders of magnitude (for Na-PHI up to 10-5 S cm-1 at 42 %RH). At the same time, the highest photocatalytic hydrogen evolution rate is observed for Na-PHI, which is mirrored by increased photo-generated charge carrier lifetimes, pointing to efficient charge carrier stabilization by mobile ions. These results indicate that ionic conductivity is an important parameter that can influence the photocatalytic activity. Besides, RH-dependent ionic conductivity is of high interest for separators, membranes, or sensors.

Download Full-text

Determination of Mobility and Charge Carriers Concentration from Ionic Conductivity in Sodium Germanate Glasses above and below Tg

ISRN Electrochemistry ◽

10.1155/2013/240571 ◽

2013 ◽

Vol 2013 ◽

pp. 1-10 ◽

Cited By ~ 3

Author(s):

Marcio Luis Ferreira Nascimento

Keyword(s):

Ionic Conductivity ◽

Charge Carrier ◽

Formation Enthalpy ◽

Large Temperature ◽

Complete Test ◽

Ionic Displacement ◽

The Difference ◽

And Migration ◽

Positively Charged

The ionic conductivity and viscous flow data of xNa2O·(1−x)GeO2, 0.05<x<0.296, have been collected in a large temperature range, below and above their glass transition temperatures (Tg). A microscopic model is proposed, assuming that the ionic displacement would result from the migration of interstitial positively charged cationic pairs whose concentration is an activated function of temperature. Below Tg, their migration is also an activated mechanism, but a “free volume” would prevail above this temperature. This discontinuity in the migration mechanism justifies a Dienes-Macedo-Litovitz (DML) relationship to be representative of conductivity data above Tg and an Arrhenius law below. According to this model, the enthalpy deduced by the fit of high temperature data using a DML equation would correspond to the charge carrier formation, whose migration enthalpy, below Tg, could be deduced by the difference between the activation energy measured in the Arrhenius domain and the charge carrier formation enthalpy. To reduce the number of adjustable parameters numerical values were physically justified. We also applied a complete test for conductivity below Tg, using the so-called weak electrolyte model, splitting activation enthalpy EσA into formation and migration enthalpies and also explaining the variation of pre-exponential term of conductivity with composition.

Download Full-text

Effects of a dual doping strategy on the structure and ionic conductivity of garnet-type electrolyte

Solid State Ionics ◽

10.1016/j.ssi.2020.115427 ◽

2020 ◽

Vol 356 ◽

pp. 115427

Author(s):

Xuefeng Shen ◽

Qian Zhang ◽

Tianxiang Ning ◽

Jianlei Liu ◽

Taoyong Liu ◽

...

Keyword(s):

Ionic Conductivity ◽

Type Electrolyte

Download Full-text

The ionic conductivity of alkali aluminum germanium phosphate glasses – comparison of Plasma CAIT with two electrode DC measurements

Zeitschrift für Physikalische Chemie ◽

10.1515/zpch-2021-3091 ◽

2021 ◽

Vol 0 (0) ◽

Author(s):

Jan L. Wiemer ◽

Kevin Rein ◽

Karl-Michael Weitzel

Keyword(s):

Ionic Conductivity ◽

Charge Carrier ◽

Ion Transport ◽

Ionic Conductivities ◽

Activation Energies ◽

Phosphate Glasses ◽

Melt Quenching ◽

Simple Tool ◽

Technique Comparison

Abstract The ionic conductivity of alkali aluminum germanium phosphates (MAGP) has been investigated by two different techniques, i.) a fs-Plasma-Charge Attachment Induced Transport (CAIT) approach and ii.) a classical two electrode DC approach. Amorphous MAGP samples of the composition M1.5Al0.5Ge1.5(PO4)3 M=(Li–Cs) have been synthesized by the melt-quenching technique. Comparison of fs-Plasma-CAIT and DC data reveal that the ionic conductivities as well as the activation energies for ion transport agree within the error margins of the experiment. While conventional expectation suggests that a DC approach should fail because of spontaneous charge carrier blocking, this work demonstrates that DC measurements are a simple tool for quantifying ionic conductivities provided that only a small amount of charge has been transported in total.

Download Full-text

Transport Properties of Thoria and Thoria-based Solid Solutions

Zeitschrift für Naturforschung A ◽

10.1515/zna-1972-0714 ◽

1972 ◽

Vol 27 (7) ◽

pp. 1138-1149 ◽

Cited By ~ 3

Author(s):

T. H. Etsell

Keyword(s):

Ionic Conductivity ◽

Charge Carrier ◽

Transport Properties ◽

Solid Solutions ◽

Oxygen Pressure ◽

Transport Numbers ◽

Ionic Conductors ◽

Related Data ◽

Consistent Picture ◽

P Type

Abstract The methods for obtaining transport numbers in oxides are described and associated experimental difficulties are discussed. Their reliability is assessed and used in conjunction with related data to offer a consistent picture for thoria and thoria-based solutions between 500° and 1600 °C. Both are ionic conductors within certain ranges of oxygen pressure. It is concluded that, for ThO2,and, for ThO2 -Y2O3 solutions (10-20 mole % YO1.5),where P⊕ P⊖ , respectively, are the oxygen pressures (atm) where the ionic and p-type and the ionic and n-type conductivities are equal. Ionic conductivity and charge carrier mobilities in thoria are briefly considered

Download Full-text