Chemical Research in Chinese Universities ›› 2021, Vol. 37 ›› Issue (2): 328-334.doi: 10.1007/s40242-021-1041-6

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Anti-corrosive Hybrid Electrolytes for Rechargeable Aqueous Zinc Batteries

WANG Jia1,2, QIU Huayu2, ZHAO Zhiming2, ZHANG Yuchen1,2, ZHAO Jingwen2, MA Yinglei2, LI Jiedong2, XING Min2, LI Guicun1, CUI Guanglei2   

  1. 1. College of Materials Science and Engineering, Qingdao University of Science and Technology, Qingdao 266042, P. R. China;
    2. Qingdao Industrial Energy Storage Research Institute, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao 266101, P. R. China
  • Received:2021-01-30 Online:2021-04-01 Published:2021-03-09
  • Contact: ZHAO Jingwen, LI Guicun, CUI Guanglei E-mail:zhaojw@qibebt.ac.cn;guicunli@qust.edu.cn;cuigl@qibebt.ac.cn
  • Supported by:
    This work was supported by the National Key R&D Program of China (No.2017YFE0127600), the Strategic Priority Research Program of the Chinese Academy of Sciences(No.XDA21070304), the National Natural Science Foundation of China(Nos.U1706229, 21975271), the Taishan Scholars of Shandong Province, China(No.ts201511063), the Youth Innovation Promotion Association of Chinese Academy of Sciences(No.2019214), and the QIBEBT(No.ZZBS201808).

Abstract: Aqueous zinc(Zn)-metal cells with cost-effective components and high safety have long been a promising large-scale energy storage system, but Zn anodes are intrinsically unstable with common aqueous electrolytes, causing substantial underutilization of the theoretical capacity. In this work, we report a strictly neutral aqueous Zn electrolyte at a low cost by leveraging the dynamic hydrolysis equilibrium of a dual-salt Zn(Ac)2/NaAc(Ac: CH3COO-) formulation. With the pH regulation, the corrosion and hydrogen evolution encountered in Zn anodes can be suppressed significantly. This hybrid aqueous electrolyte not only enables dendrite-free Zn plating/stripping at a nearly 95% Coulombic efficiency[an increase of 24% compared to that of the single-salt 1 mol/L Zn(Ac)2 electrolyte], but also supports the reversible operation of Zn cells paired with either Na3V2(PO4)3 or iodine cathodes—the former delivers a high output voltage of 1.55 V with an energy level of 99.5 W·h/kg(based on the mass of the cathode), and the latter possesses a high specific capacity of 110.9 mA·h/g while yielding long-term cyclability(thousands of cycles). These findings open up a new avenue of modifying practical electrolytes having targeted properties to stabilize multivalent metal anodes.

Key words: pH regulation, Aqueous Zn-based battery, Na3V2(PO4)3cathode