Qiwen Zhao, Ying Chen, Ying Chen, Wen Liu, Antai Zhu, Zikun Li, Hanwei He, Bingang Xu, Yuejiao Chen, Yuejiao Chen, Libao Chen
ABSTRACT Aqueous electrolytes, while conferring inherent safety advantages, inevitably induce hydrogen‐evolution corrosion, resulting in nonuniform Zn deposition and shortened cycle life. Herein, a novel electrolyte with buffering function is designed to modulate ion behavior and stabilize interface pH. The introduced additive acts as a cushion maskant (CM) that spontaneously adsorbs onto the Zn metal surface, displacing interfacial water molecules and thereby suppressing corrosion. Simultaneously, its coordination with Zn 2+ homogenizes the Zn 2+ flux to promote uniform deposition. Moreover, the protonation/deprotonation equilibria of CM within the electrolyte buffer local pH fluctuations, stabilizing the interfacial microenvironment. Consequently, a beneficial solid electrolyte interphase (SEI) is established, which further shields the Zn anode, enhances interfacial stability, and markedly improves cycling durability. Accordingly, Zn//Zn symmetrical cells in CM‐containing electrolyte can realize exceptional lifespan for 2800 h at 2 mA cm −2 and 970 h even at 10 mA cm −2 . In addition, CM demonstrates the superior practical applicability in Zn//I 2 full cells for long‐term and rate tests. Zn//I 2 pouch full cell can operate for 150 mAh with CM. This study offers a distinctive and comprehensive strategy for stabilizing the Zn anode.