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J Am Chem Soc. 2019 Apr 17;141(15):6338-6344. doi: 10.1021/jacs.9b00617. Epub 2019 Apr 9.

Reverse Dual-Ion Battery via a ZnCl2 Water-in-Salt Electrolyte.

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Department of Chemistry , Oregon State University , Corvallis , Oregon 97331-4003 , United States.
Argonne National Laboratory , Lemont , Illinois 60439 , United States.


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, Zn3[Fe(CN)6]2. This unique battery configuration benefits from the usage of a 30 m ZnCl2 "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 ZnCl2 electrolyte. RDIBs provide a configuration-based solution to exploit the practicality of cation-deficient cathode materials in aqueous electrolytes.


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