Eliminating Zn dendrites by commercial cyanoacrylate adhesive for zinc ion battery

Zn metal with high Coulombic efficiency (CE) and stability are highly desired for developing high-capacity, low-cost, and environmentally friendly aqueous Zn ion batteries. To suppress the formation of byproducts and unfavorable dendrites which lead to poor cycling stability of batteries, a spin-coating method is used to uniformly coat a commercial and solvent-free cyanoacrylate adhesive (502 glue) on the Zn surface. The obtained layer serves as an artificial solid/electrolyte interphase, which not only effectively protects the Zn surface from water molecules and O2, but also induces the even stripping/plating of Zn ions for the regulation of nucleation overpotential based on the increased ion diffusion barrier to homogenize the interfacial Zn2+ flux. Consequently, this strategy achieves stable voltage profiles and a high CE of 99.74% during cycles for the 502-coated Zn, far superior to that of bare Zn. Finally, this simple strategy also exhibits high cycling stability due to the elimination of side reactions and Zn dendrites, which is of significance for enhancing the full-cell performance matched with typical V2O5·1.6H2O cathode.