This title appears in the Scientific Report :
2020
Please use the identifier:
http://dx.doi.org/10.1016/j.ssi.2019.03.017 in citations.
Please use the identifier: http://hdl.handle.net/2128/25571 in citations.
Impact of sodium excess on electrical conductivity of Na3Zr2Si2PO12 + x Na2O ceramics
Impact of sodium excess on electrical conductivity of Na3Zr2Si2PO12 + x Na2O ceramics
In order to industrialize NaSICON materials, modern fabrication techniques have to be used and one of those techniques for producing large-scale electrolyte sheets with 10–300 μm thickness is tape casting. Such technique however requires a sintering step at high temperatures leading to sodium deplet...
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Personal Name(s): | Naqash, Sahir (Corresponding author) |
---|---|
Tietz, Frank / Yazhenskikh, Elena / Müller, Michael / Guillon, Olivier | |
Contributing Institute: |
Werkstoffstruktur und -eigenschaften; IEK-2 Helmholtz-Institut Münster Ionenleiter für Energiespeicher; IEK-12 JARA-ENERGY; JARA-ENERGY Werkstoffsynthese und Herstellungsverfahren; IEK-1 |
Published in: | Solid state ionics, 336 (2019) S. 57-66 |
Imprint: |
Amsterdam [u.a.]
Elsevier Science
2019
|
DOI: |
10.1016/j.ssi.2019.03.017 |
Document Type: |
Journal Article |
Research Program: |
Methods and Concepts for Material Development Electrochemical Storage |
Subject (ZB): | |
Link: |
Get full text Published on 2019-03-23. Available in OpenAccess from 2021-03-23. Get full text Published on 2019-03-23. Available in OpenAccess from 2021-03-23. |
Publikationsportal JuSER |
Please use the identifier: http://hdl.handle.net/2128/25571 in citations.
In order to industrialize NaSICON materials, modern fabrication techniques have to be used and one of those techniques for producing large-scale electrolyte sheets with 10–300 μm thickness is tape casting. Such technique however requires a sintering step at high temperatures leading to sodium depletion due to evaporation. The sodium loss becomes more significant for large-area and thin components. In order to investigate and compensate the sodium loss, NaSICON compositions with sodium excess were prepared, i.e. Na3Zr2Si2PO12 + x Na2O (0 ≤ x ≤ 0.2). The sodium loss can be reduced by applying a two-step sintering process (1250 °C for only 0.5 h and then at 1230 °C for 5 h). Several characterization techniques were used to analyze the resulting ceramics, the sodium depletion and its consequence on electrical conductivity. Chemical analyses indicated that all compositions were sodium deficient. Furthermore, the weight loss was investigated by thermogravimetric analysis confirming the reduction of weight loss by a factor 2 by applying a two-step sintering procedure with lower second sintering temperature. Initial thermodynamic calculations of the phase equilibria at high temperatures confirm the predominant evaporation of sodium. The highest electrical conductivity (1.6 ⋅ 10−3 S cm−1 at 25 °C) was measured for the composition showing the least sodium deficiency (x = 0.2). Furthermore, the activation energy of bulk and grain boundary conductivity decreased with increasing x in system. |