Achieving stable Zn metal anode via a simple NiCo layered double hydroxides artificial coating for high performance aqueous Zn-ion batteries

Abstract Aqueous Zn-ion batteries have become one of the most promising candidates for next-generation energy storage devices due to low price, nontoxicity, safety, and high theoretical capacity. However, the issues of Zn dendrite, H2 evolution, and corrosion severely hinder their future development. Here, a simple NiCo layered double hydroxides (NiCo-LDH) artificial coating is constructed on Zn anode (denoted as NCLZn) by spin-coating method. The prepared NiCo-LDH coating with abundant metal sites not only can increase the active sites to guide the uniform deposition of Zn2+, but also can suppress the side reactions as a physical barrier. Meantime, the NiCo-LDH coating also improves the wettability of electrolyte and reduces the interface resistance. Consequently, compared with bare Zn, the symmetric cells with NCLZn anode exhibit a stable overpotential (