TY - JOUR
T1 - Stabling Zinc Metal Anode with Polydopamine Regulation through Dual Effects of Fast Desolvation and Ion Confinement
AU - Wang, Tingting
AU - Wang, Pinji
AU - Pan, Liang
AU - He, Zhangxing
AU - Dai, Lei
AU - Wang, Ling
AU - Liu, Shude
AU - Jun, Seong Chan
AU - Lu, Bingan
AU - Liang, Shuquan
AU - Zhou, Jiang
N1 - Publisher Copyright:
© 2022 Wiley-VCH GmbH.
PY - 2023/2/3
Y1 - 2023/2/3
N2 - Metal zinc is recognized as a promising anode candidate for aqueous zinc-ion batteries (AZIBs), however, dendrites and byproducts formation severe deteriorate its reversibility and practical lifespan. Herein, a polydopamine (PDA) layer, which offers the dual effects of fast desolvation and ion confinement, is constructed on the surface of a Zn anode for efficient AZIBs. The abundant polar functional groups in PDA significantly enhance interfacial contact in aqueous media, which reduces the number of water molecules reaching the zinc surface through fast desolvation, thus lowering the energy barrier for Zn2+ migration. Furthermore, the porous PDA coating controls the ion flux via the ion-confinement effect, thereby accelerating Zn2+ kinetics on the zinc surface. Consequently, Zn@PDA exhibits significantly improved Zn2+ deposition kinetics (nucleation potential of only 32.6 mV vs 50.2 mV of bare Zn) compared with bare Zn at 2.0 mA cm−2, with a dendrite-free surface and negligible byproduct formation. When paired with a MnO2 cathode, the Zn@PDA//MnO2 cell delivers high discharge capacity and long cycle stability without significant performance deterioration over 1000 cycles at 1.0 A g−1. Additionally, the cell demonstrates excellent shelving-restoring performance.
AB - Metal zinc is recognized as a promising anode candidate for aqueous zinc-ion batteries (AZIBs), however, dendrites and byproducts formation severe deteriorate its reversibility and practical lifespan. Herein, a polydopamine (PDA) layer, which offers the dual effects of fast desolvation and ion confinement, is constructed on the surface of a Zn anode for efficient AZIBs. The abundant polar functional groups in PDA significantly enhance interfacial contact in aqueous media, which reduces the number of water molecules reaching the zinc surface through fast desolvation, thus lowering the energy barrier for Zn2+ migration. Furthermore, the porous PDA coating controls the ion flux via the ion-confinement effect, thereby accelerating Zn2+ kinetics on the zinc surface. Consequently, Zn@PDA exhibits significantly improved Zn2+ deposition kinetics (nucleation potential of only 32.6 mV vs 50.2 mV of bare Zn) compared with bare Zn at 2.0 mA cm−2, with a dendrite-free surface and negligible byproduct formation. When paired with a MnO2 cathode, the Zn@PDA//MnO2 cell delivers high discharge capacity and long cycle stability without significant performance deterioration over 1000 cycles at 1.0 A g−1. Additionally, the cell demonstrates excellent shelving-restoring performance.
KW - aqueous zinc-ion batteries
KW - desolvation effect
KW - ion-confinement effect
KW - polydopamine coatings
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U2 - 10.1002/aenm.202203523
DO - 10.1002/aenm.202203523
M3 - Article
AN - SCOPUS:85144105364
SN - 1614-6832
VL - 13
JO - Advanced Energy Materials
JF - Advanced Energy Materials
IS - 5
M1 - 2203523
ER -
