Aqueous Zn-ion batteries (AZIBs) are considered as a promising energy storage device owing to their inherent safety, cost-effectiveness, and environment friendliness. However, their commercialization is hindered by critical challenges, including severe dendrite growth and poor electrochemical performance stemming from an inefficient cathode-electrolyte interaction, thus leading to inevitable short circuits and significant capacity decay. Herein, sec-butanol (SBT) is applied as a bifunctional electrolyte additive in a 1 M Zn(ClO