摘要
The stability of Zn anode is significantly affected by the fluctuation of interfacial pH value,but there is still limited attention paid to this issue.In this work,we regulating the interfacial pH value to enhance the stability of Zn anode via a novel environmentally-friendly additive D-galactose(D-Gal).D-Gal with great negative electrostatic potential and a low lowest unoccupied molecular orbital(LUMO)level energy was chemisorbed on Zn anode to not only isolate H2O contact with Zn anode.The in-situ pH test confirmed that D-Gal guaranteed a stable pH environment.Furthermore,the D-Gal additive contributes to uniform deposition for stable Zn anode.Therefore,the Zn||Zn symmetric cell exhibits a cycle life of 2600 h at 1.0 mA·cm^(-2)and 1.0 mAh·cm^(-2).Even at high current density of 10 mA·cm^(-2),it can stabilize 900 h.When paired with a vanadium-based cathode,the full battery demonstrated a stable capacity retention of 62.78%at 1.0 A·g^(-1)following 2000 cycles.This work provides a new insight into interfacial stability for aqueous zinc metal batteries.
基金
supported by the Natural Science Foundation of Xinjiang Uygur Autonomous Region(No.2023D01C168)
the State Key Laboratory of Powder Metallurgy at Central South University,the Major Research Plan of the National Natural Science Foundation of China(No.92472116)
the Xinjiang“Tianchi Talent”Introduction Program Youth Doctoral Program(No.51052401544)
the Tianshan Innovation Team Program of Xinjiang Uygur Autonomous Region(No.2023D14001)
the Central South University Innovation-Driven Research Program(No.2023CXQD038).
