近日，课题组在钠金属电池取得重要进展，相关工作以题为"Configuration-Entropy-Driven Electrolyte with Anion-Enhanced Solvation Structures for Fast-Charging Sodium Metal Batteries"的论文发表在Adv Funt Mater期刊。第一作者为黄民松、胡帆、温祖标，通讯作者为卢章辉和上海大学施思齐教授。

摘要：

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 (ΔSconf, 33.09 J mol−1 K−1) compared to the conventional strong-solvating ester electrolyte (24.28 J mol−1 K−1). The high ΔSconf 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||Na3V2(PO4)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 design from the perspective of solvation configurational entropy.

原文链接：https://doi.org/10.1002/adfm.202524686

今日新能源公众号解读：https://mp.weixin.qq.com/s/uCB7A2p7Wx3bw5paVfyzQg