Journal of Energy Chemistry ›› 2023, Vol. 86 ›› Issue (11): 579-586.DOI: 10.1016/j.jechem.2023.07.043

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Enlarging Zn deposition space via regulating Sn-induced effective interface for high areal capacity zinc-based flow battery

Yuning Suna,b, Siyu Zhanga,b, Qiming Zhanga,b, Lantong Cuia,b, Pengfei Wanga,b, Yanbin Yinc, Qian Wangd,*, Qinzhi Laia,b,*   

  1. aSchool of Materials Science and Engineering, Northeastern University, Shenyang 110819, Liaoning, China;
    bCollege of Resources and Materials, Northeastern University at Qinhuangdao, Qinhuangdao 066004, Hebei, China;
    cDivision of Energy Storage, Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, Liaoning, China;
    dDepartment of Advanced Energy Materials, College of Materials Science and Engineering, Sichuan University, Chengdu 610064, Sichuan, China
  • Received:2023-05-15 Revised:2023-07-23 Accepted:2023-07-31 Online:2023-11-15 Published:2023-11-07
  • Contact: *E-mail addresses: wangqian1215@scu.edu.cn (Q. Wang), laiqinzhi@neuq.edu.cn (Q. Lai).

Abstract: Zinc-based flow batteries (ZFBs) have aroused great favor in large-scale energy storage due to the high security and low cost. However, the low areal capacity arising from the limited space for Zn plating hinders the further development. Herein, a novel carbon felt-Sn-carbon felt sandwich host (CSCH) is designed and constructed. Benefiting from the strong chemical absorption and the dehydration effect on Zn(H2O)62+, the Sn activation layer in the CSCH demonstrates the lowest comprehensive resistance for Zn deposition. Thus, Zn is induced to nucleate preferentially on the Sn activation layer, and grows towards the membrane, regulating the spatial distribution of Zn electrochemical deposits, which remarkably improves the areal capacity and cyclic stability of Zn anode. Consequently, the zinc-bromine flow batteries equipped with CSCH electrodes can achieve the ultra-high areal capacity of 120 mA h cm-2 at 80 mA cm-2, and run stably for 140 h with average energy efficiency of 80.3% in the extreme condition (80 mA cm-2, 80 mA h cm-2). This innovative work will inspire future advanced designs for high areal capacity electrodes in ZFBs.

Key words: Zinc-based flow batteries, High areal capacity, Sn-induced deposition, Zn deposition depth