Single Sodium-Ion Conducting Sulfonated Polytriazole and Composite Electrolyte Membranes

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Badri, Rahul ; Agarwal, Seema ; Majumder, Subhasish Basu ; Banerjee, Susanta:
Single Sodium-Ion Conducting Sulfonated Polytriazole and Composite Electrolyte Membranes.
In: Chemistry : a European Journal. Bd. 31 (2025) Heft 42 . - e202501726.
ISSN 1521-3765
DOI: https://doi.org/10.1002/chem.202501726

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Abstract

The ongoing energy crisis and the increasing demand for lithium metal batteries (LMBs) have raised concerns about the availability and affordability of lithium. In light of their abundance and lower production costs, sodium metal batteries (SMBs) have the potential to replace LMBs. However, due to the reactivity of organic electrolytes with the sodium anode, it is essential to design safer electrolytes to prevent short-circuiting. This study focuses on the design and evaluation of fillers and single-ion conducting polymer electrolytes (SICPEs), including sodium salt of sulfonated graphene oxide (Na-SGO), sulfonated polytriazole (PTSICPE-90), and various blend composites, which outperform Celgard 2400 in terms of thermal, mechanical, and dimensional stability. The Na-SGO filler demonstrated a desirable Na-ion conductivity of 11.91 × 10−2 Scm−1 at 90 °C in a solvated state. Due to the high solvent absorption (70 wt.%), good wettability (22.2°), and significant porosity (58%) of the SICPEs, notable Na-ion conductivities of 0.23 × 10−5 Scm−1 (nonsolvated at 30 °C) and 1.17 × 10−5 Scm−1 (solvated at 40 °C) were observed. These properties make them an appealing choice for electrolytic applications in SMBs.