Zeolite‐Based Solid‐State Electrolyte for Highly Stable Zinc Metal Batteries

Abstract Solid‐state electrolytes are demonstrated great inhibition effect on cathodic dissolution and anodic side reactions in zinc‐ion batteries. In this work, a novel zeolite‐based solid electrolyte (Zeolite‐Zn) enriched with zinc ions, high ionic conductivity (2.54 mS cm −1 ) and high Zn 2+ transference number (0.866) is prepared through ion‐exchange strategy. Owing to the anhydrous characteristic, Zeolite‐Zn electrolyte effectively extends the electrochemical window to 2.5 V and inhibits hydrogen evolution reaction. As for Zn||Zeolite‐Zn||NH 4 V 4 O 10 batteries, high‐capacity retention rate of 84.9% can be achieved after 1010 cycles at 0.5 A g −1 . Even at high temperature of 60 °C, the NH 4 V 4 O 10 cathode is able to maintain high reversible capacity of 239.2 mAh g −1 after 110 cycles, which can be attributed to the superior structural stability, weak interfacial side reaction, low zinc migration barrier, and inhibited vanadium dissolution of Zeolite‐Zn electrolyte. In addition, the as‐fabricated Zn||Zeolite‐Zn||AC@I 2 batteries have also demonstrated brilliant performances, suggesting its promising potential in practical application of zinc‐based secondary batteries. This study provides mechanistic insights and structural inspiration for the original design of inorganic solid electrolytes.