Flower-like Zn-Al-In layered double oxides synthesized by a facile hydrothermal method as ultra-high cycle stability anodic for zinc-nickel battery

Extensive scale commercial application of zinc nickel battery is limited for its poor cycle stability. In this paper, a zinc anodic material with ultra-high cycle stability is explored by structural design and element doping of Zn-Al layered double oxides (Zn-Al LDO). Flower-like Zn-Al-In LDO and pure Zn-Al LDO are synthesized by facile hydrothermal and calcination methods. Compared with pure Zn-Al LDO,Flower-like structure provides more pores to promote the electrolyte penetration and effectively reduce the local current density. The indium additive with high hydrogen evolution overpotential in Zn-Al LDO inhibits the corrosion of zinc electrode in high concentration alkaline solution. After a series of electrochemical tests, Zn-Al-In LDO has the lowest redox voltage (0.448 V vs. Hg/HgO) and lower charge transfer resistance (1.053 Omega). Meanwhile, compared with pure Zn-Al LDO, the corrosion potential and corrosion current of Zn-Al-In LDO are significantly reduced to (-1.372 V) and (-0.01458 mA cm(-2)) and the capacity retention rate of flower-like Zn-Al-In LDO is always above 90% within 2000 cycles. The rational design of flower-like Zn-Al-In LDO microsphere electrode paves new ways to develop the high-performance of zinc-nickel secondary batteries. (C) 2021 Elsevier B.V. All rights reserved.

Automated summary

In this study, a zinc anodic material with ultra-high cycle stability was explored by structural design and element doping, leading to the synthesis of flower-like Zn-Al-In LDO and pure Zn-Al LDO. The addition of indium in Zn-Al LDO effectively inhibits the corrosion of zinc electrode and enhances the performance of zinc-nickel secondary batteries.