Detrimental side reactions and irregular zinc dendrite growth restrict the development of aqueous zinc ion batteries (AZIBs). Although the deposition dominated by Zn (002) crystal plane is proved to mitigate the issues of side reaction and zinc dendrites, inducing the oriented deposition of Zn (002) plane faces thermodynamic challenges. Herein, we use MXene quantum dots (F-MQDs) as an electrolyte additive, which orientedly adsorb on the Zn (002) crystal plane, as a target to guide the preferential deposition of zinc ions. Benefit from the abundant fluorine (F) on the surface, F-MQDs shows a higher absorption energy on the Zn (002) plane than other planes. The installed F-MQDs further preferentially adsorb Zn ions and thus guides the Zn (002)-oriented deposition. As the exposed Zn (002) is the plane that has the lowest surface energy, the suppression of HER, prohibition of zinc corrosion and the elimination of zinc dendrite are achieved synchronously. As a result, the symmetrical Zn||Zn cell shows a prolonged lifespan up to 650 h at the current density and deposition capacity of 1 mA cm −2 and 1 mA h cm −2 . Asymmetric Zn||Cu cell also yield a high average coulombic efficiency of 99.67%. Zn||V 2 O 5 full cells also demonstrate a augmented cycling performance with the highest specific capacity of 133.1 mAh g −1 at 5 A g −1 . This work provides an insight in targeted deposition for achieving high-performance AZIBs.
Water-induced side reactions and unfavorable undesirable growth have restricted the further development of aqueous zinc-ion batteries. Electrolyte additives are considered as a pragmatic and viable approach to address this issue, owing to their ease of operation and satisfactory compatibility. This study identifies diprophylline as a promising additive for electrolytes, underscoring its favorable adsorption energy with zinc metal. The selective adsorption of diprophylline has been demonstrated to engender two primary effects. Firstly, it reconstructs a water-lean electric double layer, and secondly, it enhances the textured growth of Zn(002). Furthermore, diprophylline weakens the coordination bonding between Zn 2+ and H 2 O to regulate the solvation structure of Zn 2+ . Consequently, the zinc symmetric battery functions stably for over 2900 h at 5 mA cm −2 . The Zn||Cu asymmetric battery displays an average coulombic efficiency as high as 99.89 % across 4000 cycles. This research presents an affordable and easily operable electrolyte modification method for developing a Zn anode/electrolyte interface that exhibits excellent stability and reversibility.
危险品化学品经营许可证（带存储）