Highly Reversible Aqueous Zinc Batteries enabled by Zincophilic–Zincophobic Interfacial Layers and Interrupted Hydrogen-Bond Electrolytes

Longsheng Cao, Dan Li, Fernando A. Soto, Victor Ponce, Bao Zhang, Lu Ma, Tao Deng, Jorge M. Seminario, Enyuan Hu, Xiao Qing Yang, Perla B. Balbuena, Chunsheng Wang

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

Aqueous Zn batteries promise high energy density but suffer from Zn dendritic growth and poor low-temperature performance. Here, we overcome both challenges by using an eutectic 7.6 m ZnCl2 aqueous electrolyte with 0.05 m SnCl2 additive, which in situ forms a zincophilic/zincophobic Sn/Zn5(OH)8Cl2⋅H2O bilayer interphase and enables low temperature operation. Zincophilic Sn decreases Zn plating/stripping overpotential and promotes uniform Zn plating, while zincophobic Zn5(OH)8Cl2⋅H2O top-layer suppresses Zn dendrite growth. The eutectic electrolyte has a high ionic conductivity of ≈0.8 mS cm−1 even at −70 °C due to the distortion of hydrogen bond network by solvated Zn2+ and Cl. The eutectic electrolyte enables Zn∥Ti half-cell a high Coulombic efficiency (CE) of >99.7 % for 200 cycles and Zn∥Zn cell steady charge/discharge for 500 h with a low overpotential of 8 mV at 3 mA cm−2. Practically, Zn∥VOPO4 batteries maintain >95 % capacity with a CE of >99.9 % for 200 cycles at −50 °C, and retain ≈30 % capacity at −70 °C of that at 20 °C.

Original languageEnglish (US)
Pages (from-to)18845-18851
Number of pages7
JournalAngewandte Chemie - International Edition
Volume60
Issue number34
DOIs
StatePublished - Aug 16 2021

All Science Journal Classification (ASJC) codes

  • Catalysis
  • Chemistry(all)

Cite this