A Dual Organic Solvent Zn-Ion Electrolyte Enables Highly Stable Zn Metal Batteries

• DOI: 10.1021/acs.nanolett.3c01406
• Publication Date: 2023-06-27T15:57:59Z
• Authors: Ruiqi He; Fangfang Yu; Kuan Wu; Hao-Xuan Liu; Zhen Li; Hua Kun Liu; Shi-Xue Dou; Chao Wu
• Keywords: Stripping (fiber); Dimethyl carbonate; Plating (geology)

Aqueous zinc (Zn) batteries have been regarded as an alternative to lithium-ion due their high abundance, low cost, and higher intrinsic safety. However, the Zn plating/stripping reversibility, dendrite growth, continuous water consumption hindered practical application of aqueous anodes. Herein, a hydrous organic Zn-ion electrolyte based on dual solvent, namely hydrated Zn(BF4)2 salt dissolved in dimethyl carbonate (DMC) vinyl (EC) solvents [denoted Zn(BF4)2/DMC/EC], can address these problems, which not only inhibits side reactions but also promotes uniform through formation stable solid state interface layer Zn2+-EC/2DMC pairs. This enables electrode stably undergo >700 cycles at rate 1 mA cm–2 with Coulombic efficiency 99.71%. Moreover, full cell paired V2O5 demonstrates excellent cycling stability without capacity decay A g–1 after 1600 cycles.