Saturating the Matrix: Nanocomposite Solution-Processed Sodium Aluminophosphate Solid Electrolytes.

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 spectromet

SUBMITTER: Gill TE 

PROVIDER: S-EPMC12522096 | biostudies-literature | 2025 Oct

REPOSITORIES: biostudies-literature