Blocking the Dendrite-Growth of Zn Anode by Constructing Ti4O7 Interfacial Layer in Aqueous Zinc-Ion Batteries

Zinc metal is a promising choice as a high-capacity and cost-effective anode for aqueous zinc-based batteries. However, it faces challenges related to low cycling stability and poor reversibility due to parasitic reactions and the growth of zinc dendrites. In this study, a solution is proposed by introducing a conductive Ti4O7 layer on the zinc anode to enhance electrode stability. The Ti4O7 layer serves a dual purpose, effectively preventing spontaneous corrosion of the zinc anode in the electrolyte, thereby inhibiting the hydrogen evolution reaction and the generation of byproducts. Simultaneously, it promotes Zn nucleation and ensures a uniform electric field distribution, resulting in homogeneous Zn plating and stripping compared to using a bare zinc anode. Consequently, the Ti4O7-coated Zn anode experiences a significant reduction in over-potential, demonstrating long-term stability and dendrite-free behavior. This outcome ensures low polarization potential and high cycling stability in zinc-ion batteries. The work underscores the potential of conductive oxides in the development of stable metal electrodes.