A weakly solvating electrolyte towards practical rechargeable aqueous zinc-ion batteries

Xin Shi, Jinhao Xie, Jin Wang, Shilei Xie (), Zujin Yang () and Xihong Lu ()
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Xin Shi: Sun Yat-Sen University
Jinhao Xie: Sun Yat-Sen University
Jin Wang: Sun Yat-Sen University
Shilei Xie: Dongguan University of Technology
Zujin Yang: Sun Yat-Sen University
Xihong Lu: Sun Yat-Sen University

Nature Communications, 2024, vol. 15, issue 1, 1-9

Abstract: Abstract Structure deterioration and side reaction, which originated from the solvated H2O, are the main constraints for the practical deployment of both cathode and anode in aqueous Zn-ion batteries. Here we formulate a weakly solvating electrolyte to reduce the solvating power of H2O and strengthen the coordination competitiveness of SO42− to Zn2+ over H2O. Experiment results and theoretical simulations demonstrate that the water-poor solvation structure of Zn2+ is achieved, which can (i) substantially eliminate solvated-H2O-mediated undesirable side reactions on the Zn anode. (ii) boost the desolvation kinetics of Zn2+ and suppress Zn dendrite growth as well as structure aberration of the cathode. Remarkably, the synergy of these two factors enables long-life full cells including Zn/NaV3O8·1.5H2O, Zn/MnO2 and Zn/CoFe(CN)6 cells. More importantly, practical rechargeable AA-type Zn/NVO cells are assembled, which present a capacity of 101.7 mAh and stability of 96.1% capacity retention after 30 cycles at 0.66 C.

Date: 2024
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DOI: 10.1038/s41467-023-44615-y

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