Wu Xianyong, Xu Yunkai, Zhang Chong, Leonard Daniel P, Markir Aaron, Lu Jun, Ji Xiulei
Department of Chemistry , Oregon State University , Corvallis , Oregon 97331-4003 , United States.
Argonne National Laboratory , Lemont , Illinois 60439 , United States.
J Am Chem Soc. 2019 Apr 17;141(15):6338-6344. doi: 10.1021/jacs.9b00617. Epub 2019 Apr 9.
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[Fe(CN)]. This unique battery configuration benefits from the usage of a 30 m ZnCl "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 electrolyte. RDIBs provide a configuration-based solution to exploit the practicality of cation-deficient cathode materials in aqueous electrolytes.
双离子电池以阴极储存阴离子并与阳极中阳离子嵌入相耦合而闻名。我们通过让阳极吸收阴离子，以及让缺乏阳离子的阴极容纳阳离子，来颠倒双离子电池（DIB）中阳极和阴极的阴离子/阳离子储存化学顺序，从而将其作为反向双离子电池（RDIB）运行。插入阴离子的阳极是一种纳米复合材料，其中二茂铁包裹在微孔碳内部，阴极是插入锌的普鲁士蓝，即Zn[Fe(CN)]。这种独特的电池配置得益于使用了30 m ZnCl“盐包水”电解质。这种电解质能使二茂铁的溶解降至最低；它提高了阴极中的阳离子嵌入电位，并降低了阳极中的阴离子嵌入电位，因此与稀ZnCl电解质相比，全电池电压提高了0.35 V。RDIB提供了一种基于配置的解决方案，以利用缺乏阳离子的阴极材料在水性电解质中的实用性。
