TY - JOUR
T1 - Highly Reversible Zinc Metal Anode in a Dilute Aqueous Electrolyte Enabled by a pH Buffer Additive
AU - Zhang, Wei
AU - Dai, Yuhang
AU - Chen, Ruwei
AU - Xu, Zhenming
AU - Li, Jianwei
AU - Zong, Wei
AU - Li, Huangxu
AU - Li, Zheng
AU - Zhang, Zhenyu
AU - Zhu, Jiexin
AU - Guo, Fei
AU - Gao, Xuan
AU - Du, Zijuan
AU - Chen, Jintao
AU - Wang, Tianlei
AU - He, Guanjie
AU - Parkin, Ivan P.
PY - 2023/1/26
Y1 - 2023/1/26
N2 - Aqueous zinc-ion batteries have drawn increasing attention due to the intrinsic safety, cost-effectiveness and high energy density. However, parasitic reactions and non-uniform dendrite growth on the Zn anode side impede their application. Herein, a multifunctional additive, ammonium dihydrogen phosphate (NHP), is introduced to regulate uniform zinc deposition and to suppress side reactions. The results show that the NH4+ tends to be preferably absorbed on the Zn surface to form a “shielding effect” and blocks the direct contact of water with Zn. Moreover, NH4+ and (H2PO4)− jointly maintain pH values of the electrode-electrolyte interface. Consequently, the NHP additive enables highly reversible Zn plating/stripping behaviors in Zn//Zn and Zn//Cu cells. Furthermore, the electrochemical performances of Zn//MnO2 full cells and Zn//active carbon (AC) capacitors are improved. This work provides an efficient and general strategy for modifying Zn plating/stripping behaviors and suppressing side reactions in mild aqueous electrolyte.
AB - Aqueous zinc-ion batteries have drawn increasing attention due to the intrinsic safety, cost-effectiveness and high energy density. However, parasitic reactions and non-uniform dendrite growth on the Zn anode side impede their application. Herein, a multifunctional additive, ammonium dihydrogen phosphate (NHP), is introduced to regulate uniform zinc deposition and to suppress side reactions. The results show that the NH4+ tends to be preferably absorbed on the Zn surface to form a “shielding effect” and blocks the direct contact of water with Zn. Moreover, NH4+ and (H2PO4)− jointly maintain pH values of the electrode-electrolyte interface. Consequently, the NHP additive enables highly reversible Zn plating/stripping behaviors in Zn//Zn and Zn//Cu cells. Furthermore, the electrochemical performances of Zn//MnO2 full cells and Zn//active carbon (AC) capacitors are improved. This work provides an efficient and general strategy for modifying Zn plating/stripping behaviors and suppressing side reactions in mild aqueous electrolyte.
KW - Additive
KW - Aqueous Electrolyte
KW - Dendrite Growth
KW - pH Buffer
KW - Zinc Anode
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UR - https://www.scopus.com/record/pubmetrics.uri?eid=2-s2.0-85143510011&origin=recordpage
U2 - 10.1002/anie.202212695
DO - 10.1002/anie.202212695
M3 - RGC 21 - Publication in refereed journal
C2 - 36375075
SN - 1433-7851
VL - 62
JO - Angewandte Chemie - International Edition
JF - Angewandte Chemie - International Edition
IS - 5
M1 - e202212695
ER -