Configuration‐Entropy‐Driven Electrolyte with Anion‐Enhanced Solvation Structures for Fast‐Charging Sodium Metal Batteries

作者：Minsong Huang, Fan Hu, Zubiao Wen, Bao Liu, Qi Xiong, Ping Wang, Chuying Ouyang, Maxim Avdeev, Zhang‐Hui Lu, Siqi Shi · 发表于：Advanced Functional Materials · 年份：2025 · DOI：10.1002/adfm.202524686 · 被引用次数：4 · 研究领域：Advanced Battery Materials and Technologies、Advancements in Battery Materials、Thermal Expansion and Ionic Conductivity

Abstract Traditional strong‐solvating electrolytes exhibit high ionic conductivity but are limited by solvent‐dominated solvation structures. The unstable solvent‐derived electrode‐electrolyte interfaces (EEIs) are detrimental to the fast‐charging performance of sodium metal batteries (SMBs). Herein, a configuration‐entropy‐driven electrolyte with diverse solvation structures induced by a strongly solvating anion and cosolvent is proposed to realize a trade‐off between high ionic conductivity and anion‐enhanced solvation structures. The electrolyte possesses 75 types of Na + solvation structure, contributing to its higher solvation configurational entropy (Δ S conf , 33.09 J mol −1 K −1 ) compared to the conventional strong‐solvating ester electrolyte (24.28 J mol −1 K −1 ). The high Δ S conf facilitates ion transport and endows the electrolyte with diverse anion‐coordination solvation structures, which promote the formation of inorganic‐rich and stable EEIs. Therefore, the configuration‐entropy‐driven electrolyte with anion‐enhanced solvation structures can reinforce the stability of Na metal anode and enable superior rate performances and cycling stability of Na||Na 3 V 2 (PO 4 ) 3 (NVP) cells. The modified Na||NVP cells deliver a high capacity retention of 98.2% at an ultrahigh rate of 60 C after 10 000 cycles. Even paired with high‐loading NVP (≈12 mg cm −2 ), the Na||NVP cells steadily operate for over 600 cycles. This work provides a unique insight into electrolyte desi...