Reverse Dual-Ion Battery via a ZnCl 2 Water-in-Salt Electrolyte

作者：Xianyong Wu, Yunkai Xu, Chong Zhang, Daniel P. Leonard, Aaron Markir, Jun Lü, Xiulei Ji · 发表于：Journal of the American Chemical Society · 年份：2019 · DOI：10.1021/jacs.9b00617 · 被引用次数：484 · 研究领域：Advanced battery technologies research、Advanced Battery Materials and Technologies、Advancements in Battery Materials

Dual-ion batteries are known for anion storage in the cathode coupled to cation incorporation in the anode. We flip the sequence of the anion/cation-storage chemistries of the anode and the cathode in dual-ion batteries (DIBs) by allowing the anode to take in anions and a cation-deficient cathode to host cations, thus operating as a reverse dual-ion battery (RDIB). The anion-insertion anode is a nanocomposite having ferrocene encapsulated inside a microporous carbon, and the cathode is a Zn-insertion Prussian blue, Zn 3 [Fe(CN) 6 ] 2 . This unique battery configuration benefits from the usage of a 30 m ZnCl 2 “water-in-salt” electrolyte. This electrolyte minimizes the dissolution of ferrocene; it raises the cation-insertion potential in the cathode, and it depresses the anion-insertion potential in the anode, thus widening the full cell’s voltage by 0.35 V compared with a dilute ZnCl 2 electrolyte. RDIBs provide a configuration-based solution to exploit the practicality of cation-deficient cathode materials in aqueous electrolytes.