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A four-electron Zn-I2 aqueous battery enabled by reversible I−/I2/I+ conversion

Author

Listed:
  • Yiping Zou

    (Hunan University)

  • Tingting Liu

    (Hunan University)

  • Qijun Du

    (Hunan University)

  • Yingying Li

    (Hunan University)

  • Haibo Yi

    (Hunan University)

  • Xing Zhou

    (Hunan University)

  • Zhuxin Li

    (Hunan University)

  • Lujie Gao

    (Hunan University)

  • Lan Zhang

    (Hunan University)

  • Xiao Liang

    (Hunan University
    Hunan University)

Abstract

Electrochemically reversible redox couples that embrace more electron transfer at a higher potential are the eternal target for energy storage batteries. Here, we report a four-electron aqueous zinc-iodine battery by activating the highly reversible I2/I+ couple (1.83 V vs. Zn/Zn2+) in addition to the typical I−/I2 couple (1.29 V). This is achieved by intensive solvation of the aqueous electrolyte to yield ICl inter-halogens and to suspend its hydrolysis. Experimental characterization and modelling reveal that limited water activity and sufficient free chloride ions in the electrolyte are crucial for the four-electron process. The merits of the electrolyte also afford to stabilize Zn anode, leading to a reliable Zn-I2 aqueous battery of 6000 cycles. Owing to high operational voltage and capacity, energy density up to 750 Wh kg−1 based on iodine mass was achieved (15–20 wt% iodine in electrode). It pushes the Zn-I2 battery to a superior level among these available aqueous batteries.

Suggested Citation

  • Yiping Zou & Tingting Liu & Qijun Du & Yingying Li & Haibo Yi & Xing Zhou & Zhuxin Li & Lujie Gao & Lan Zhang & Xiao Liang, 2021. "A four-electron Zn-I2 aqueous battery enabled by reversible I−/I2/I+ conversion," Nature Communications, Nature, vol. 12(1), pages 1-11, December.
    • Handle: RePEc:nat:natcom:v:12:y:2021:i:1:d:10.1038_s41467-020-20331-9
    DOI: 10.1038/s41467-020-20331-9
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    Cited by:

    1. Wenjiao Ma & Tingting Liu & Chen Xu & Chengjun Lei & Pengjie Jiang & Xin He & Xiao Liang, 2023. "A twelve-electron conversion iodine cathode enabled by interhalogen chemistry in aqueous solution," Nature Communications, Nature, vol. 14(1), pages 1-11, December.
    2. Guojin Liang & Bochun Liang & Ao Chen & Jiaxiong Zhu & Qing Li & Zhaodong Huang & Xinliang Li & Ying Wang & Xiaoqi Wang & Bo Xiong & Xu Jin & Shengchi Bai & Jun Fan & Chunyi Zhi, 2023. "Development of rechargeable high-energy hybrid zinc-iodine aqueous batteries exploiting reversible chlorine-based redox reaction," Nature Communications, Nature, vol. 14(1), pages 1-11, December.
    3. Zishuai Zhang & Yilong Zhu & Miao Yu & Yan Jiao & Yan Huang, 2022. "Development of long lifespan high-energy aqueous organic||iodine rechargeable batteries," Nature Communications, Nature, vol. 13(1), pages 1-11, December.

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