Gill, Thomas E;
Matthews, Guillaume;
Song, Yaoguang;
El Maoued, Mo;
Lovett, Adam J;
Sheraz, Sadia;
Lockyer, Nicholas P;
... Rettie, Alexander JE; + view all
(2025)
Saturating the Matrix: Nanocomposite Solution-Processed Sodium Aluminophosphate Solid Electrolytes.
ACS Applied Energy Materials
, 8
(19)
, Article acsaem.5c02284. 10.1021/acsaem.5c02284.
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Abstract
Amorphous lithium solid electrolytes (SE) have enabled high performance lithium metal batteries, but sodium analogues are underexplored. Here, we report sodium aluminophosphate (NAPO) SEs synthesized via spin coating from aqueous solutions. Continuous, smooth, films with submicron thickness are produced after a mild annealing step. Exploration of the Na–Al–P–O phase space reveals nanocomposite materials comprising of an amorphous NAPO with crystalline NaNO3 domains, suggesting a Na+ saturation limit within the Al–P–O matrix. A maximum ionic conductivity of ≈10–8 S cm–1 is achieved, with the presence of the insulating NaNO3 precursor necessary for high ionic conductivity. Electron microscopy, time-of-flight secondary ion mass spectrometry and optical measurements reveal that at low concentrations the NaNO3 phase is initially present as diffuse nanoparticle domains and at higher concentrations it forms isolated micron-sized particles. The optimal NAPO SE has an activation energy of 0.80(1) eV, a moderate reduced Young’s modulus ≈30 GPa and low electronic conductivity (≈10–14 S cm–1), making these materials promising candidates for artificial solid electrolyte interphases or as solid electrolytes in sodium metal batteries.
| Type: | Article |
|---|---|
| Title: | Saturating the Matrix: Nanocomposite Solution-Processed Sodium Aluminophosphate Solid Electrolytes |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1021/acsaem.5c02284 |
| Publisher version: | https://doi.org/10.1021/acsaem.5c02284 |
| Language: | English |
| Additional information: | This work is licensed under a Creative Commons License. The images or other third-party material in this article are included in the Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/ |
| Keywords: | Science & Technology, Physical Sciences, Technology, Chemistry, Physical, Energy & Fuels, Materials Science, Multidisciplinary, Chemistry, Materials Science, nanocomposite, amorphous, solid electrolyte, thin film, scalable, LITHIUM METAL, CONDUCTIVITY, INTERPHASE, ANODE, LIPON |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Chemical Engineering |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10215614 |
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