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Manipulating the ion-transfer kinetics and interface stability for high-performance zinc metal anodes
Ist Teil von
Energy & environmental science, 2020-01, Vol.13 (2), p.53-51
Ort / Verlag
Cambridge: Royal Society of Chemistry
Erscheinungsjahr
2020
Quelle
Alma/SFX Local Collection
Beschreibungen/Notizen
The zinc metal is recognized as one of the most promising anodes for Zn-based batteries in an energy-storage system. However, the deposition and transfer of bivalent Zn
2+
into the host structure suffer from sluggish kinetics accompanying the side-reactions at the interface. Herein, we report a new class of Zn anodes modified by a three-dimensional (3D) nanoporous ZnO architecture coating on a Zn plate (designated as Zn@ZnO-3D) prepared by
in situ
Zn(OH)
4
2−
deposition onto the surface. This novel structure has been proven to accelerate the kinetics of Zn
2+
transfer and deposition
via
the electrostatic attraction toward Zn
2+
rather than the hydrated one in the electrical double layer. As a consequence, it achieves an average 99.55% Zn utilization and long-time stability for 1000 cycles. Meanwhile, the Zn@ZnO-3D/MnO
2
cell shows no capacity fading after 500 cycles at 0.5 A g
−1
with a specific capacity of 212.9 mA h g
−1
. We believe that the mechanistic insight into the kinetics and thermodynamic properties of the Zn metal and the understanding of structure-interface-function relationships are very useful for other metal anodes in aqueous systems.
We report a new class of Zn anodes modified by a three-dimensional nanoporous ZnO architecture (Zn@ZnO-3D), which can accelerate the kinetics of Zn
2+
transfer and deposition, inhibit dendrite growth, and reduce the side-reactions.