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Title: Conversion Kinetics and Ionic Conductivity in Na-β”-Alumina + YSZ (Naβ”AY) Sodium Solid Electrolyte via Vapor Phase Conversion Process

Abstract

Sodium ion batteries have been receiving increasing attention and may see potential revival in the near future, particularly in large-scale grid energy storage coupling with wind and solar power generation, due to the abundant sodium resources, low cost, and sufficiently high energy density. Among the known sodium ion conductors, the Na-β”-alumina electrolyte remains highly attractive because of its high ionic conductivity. This study focuses on the vapor phase synthesis of a Na-β”-Alumina + YSZ (Naβ”AY) composite sodium electrolyte, which has higher mechanical strength and stability than conventional single phase β”-Alumina. The objectives are the measurement of conversion kinetics through a newly developed weight-gain based model and the determination of sodium ionic conductivity in the composite electrolyte. Starting samples contained ~70 vol% α-Alumina and ~30 vol% YSZ (3 mol% Y2O3 stabilized Zirconia) with and without a thin alumina surface layer made by sintering in air at 1600 °C. The sintered samples were placed in a powder of Na-β”-alumina and heat-treated at 1250 °C for various periods. Sample dimensions and weight were measured as a function of heat treatment time. The conversion of α-Alumina in the α-Alumina + YSZ composite into Naβ”AY occurred by coupled diffusion of sodium ions through Na-β”-alumina andmore » of oxygen ions through YSZ, effectively diffusing Na2O. From the analysis of the time dependence of sample mass and dimensions, the effective diffusion coefficient of Na2O through the sample, Deff, was estimated to be 1.74 x 10-7 cm2 s-1, and the effective interface transfer parameter, keff, was estimated as 2.33 x 10-6 cm s-1. By depositing a thin alumina coating layer on top of the bulk composite, the chemical diffusion coefficient of oxygen through single phase Na-β”-alumina was estimated as 4.35 x 10-10 cm2 s-1. An AC impedance measurement was performed on a fully converted Naβ”AY composite, and the conductivity of the composite electrolyte was 1.3 x 10-1 S cm-1 at 300 °C and 1.6 x 10-3 S cm-1 at 25 °C, indicating promising applications in solid state or molten salt batteries at low to intermediate temperatures.« less

Authors:
ORCiD logo [1];  [2]
  1. University of Utah, Salt Lake City, UT (United States); Chinese Academy of Sciences (CAS), Ningbo (China)
  2. University of Utah, Salt Lake City, UT (United States)
Publication Date:
Research Org.:
Univ. of Utah, Salt Lake City, UT (United States)
Sponsoring Org.:
USDOE Office of Science (SC); National Science Foundation (NSF)
OSTI Identifier:
1904680
Grant/Contract Number:  
FG02-03ER46086; DMR-1407048
Resource Type:
Accepted Manuscript
Journal Name:
Membranes
Additional Journal Information:
Journal Volume: 12; Journal Issue: 6; Journal ID: ISSN 2077-0375
Publisher:
MDPI
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; 42 ENGINEERING; sodium β”-alumina; Naβ”AY; sodium electrolyte; sodium solid-state battery; vapor phase process; sodium batteries

Citation Formats

Zhu, Liangzhu, and Virkar, Anil V. Conversion Kinetics and Ionic Conductivity in Na-β”-Alumina + YSZ (Naβ”AY) Sodium Solid Electrolyte via Vapor Phase Conversion Process. United States: N. p., 2022. Web. doi:10.3390/membranes12060567.
Zhu, Liangzhu, & Virkar, Anil V. Conversion Kinetics and Ionic Conductivity in Na-β”-Alumina + YSZ (Naβ”AY) Sodium Solid Electrolyte via Vapor Phase Conversion Process. United States. https://doi.org/10.3390/membranes12060567
Zhu, Liangzhu, and Virkar, Anil V. Mon . "Conversion Kinetics and Ionic Conductivity in Na-β”-Alumina + YSZ (Naβ”AY) Sodium Solid Electrolyte via Vapor Phase Conversion Process". United States. https://doi.org/10.3390/membranes12060567. https://www.osti.gov/servlets/purl/1904680.
@article{osti_1904680,
title = {Conversion Kinetics and Ionic Conductivity in Na-β”-Alumina + YSZ (Naβ”AY) Sodium Solid Electrolyte via Vapor Phase Conversion Process},
author = {Zhu, Liangzhu and Virkar, Anil V.},
abstractNote = {Sodium ion batteries have been receiving increasing attention and may see potential revival in the near future, particularly in large-scale grid energy storage coupling with wind and solar power generation, due to the abundant sodium resources, low cost, and sufficiently high energy density. Among the known sodium ion conductors, the Na-β”-alumina electrolyte remains highly attractive because of its high ionic conductivity. This study focuses on the vapor phase synthesis of a Na-β”-Alumina + YSZ (Naβ”AY) composite sodium electrolyte, which has higher mechanical strength and stability than conventional single phase β”-Alumina. The objectives are the measurement of conversion kinetics through a newly developed weight-gain based model and the determination of sodium ionic conductivity in the composite electrolyte. Starting samples contained ~70 vol% α-Alumina and ~30 vol% YSZ (3 mol% Y2O3 stabilized Zirconia) with and without a thin alumina surface layer made by sintering in air at 1600 °C. The sintered samples were placed in a powder of Na-β”-alumina and heat-treated at 1250 °C for various periods. Sample dimensions and weight were measured as a function of heat treatment time. The conversion of α-Alumina in the α-Alumina + YSZ composite into Naβ”AY occurred by coupled diffusion of sodium ions through Na-β”-alumina and of oxygen ions through YSZ, effectively diffusing Na2O. From the analysis of the time dependence of sample mass and dimensions, the effective diffusion coefficient of Na2O through the sample, Deff, was estimated to be 1.74 x 10-7 cm2 s-1, and the effective interface transfer parameter, keff, was estimated as 2.33 x 10-6 cm s-1. By depositing a thin alumina coating layer on top of the bulk composite, the chemical diffusion coefficient of oxygen through single phase Na-β”-alumina was estimated as 4.35 x 10-10 cm2 s-1. An AC impedance measurement was performed on a fully converted Naβ”AY composite, and the conductivity of the composite electrolyte was 1.3 x 10-1 S cm-1 at 300 °C and 1.6 x 10-3 S cm-1 at 25 °C, indicating promising applications in solid state or molten salt batteries at low to intermediate temperatures.},
doi = {10.3390/membranes12060567},
journal = {Membranes},
number = 6,
volume = 12,
place = {United States},
year = {Mon May 30 00:00:00 EDT 2022},
month = {Mon May 30 00:00:00 EDT 2022}
}

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