NaAlCl4: New Halide Solid Electrolyte for 3 V Stable Cost-Effective All-Solid-State Na-Ion Batteries

Résumé fourni par la source

Although high-voltage-stable halide solid electrolytes (SEs) have emerged, only a few Na + halide SEs have been developed thus far. Moreover, the use of expensive elements reduces the suitability of all-solid-state Na-ion batteries (ASNBs). Herein, the new mechanochemically prepared orthorhombic NaAlCl 4 is demonstrated to exhibit a 10-fold enhancement in Na + conductivity (3.9 × 10 –6 S cm –1 at 30 °C) compared to annealed samples. The feasibility of NaAlCl 4 for ASNBs is also validated for the first time. X-ray Rietveld refinement with bond valence energy landscape calculations reveals 1D-preferable 2D Na + conduction pathways. High-voltage stability up to ∼4.0 V (vs Na/Na + ) is confirmed by electrochemical measurements and theoretical calculations. Furthermore, the outstanding electrochemical performance of NaCrO 2 /Na 3 Sn ASNBs at 30 and 60 °C is demonstrated (e.g., 82.9% capacity retention at the 500th cycle at 60 °C and 1C), shedding light on the potential of the cost-effective and safe energy storage systems.

Ce résumé expose les affirmations des auteurs. BNTIC ne l’interprète pas comme une validation indépendante des résultats.