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Highly Reversible Zn Anode Enabled by Controllable Formation of Nucleation Sites for Zn-Based Batteries

机译：通过可控地形成锌基电池的成核位点实现高度可逆的锌阳极

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摘要

Aqueous Zn batteries have drawn tremendous attention for their several advantages. However, the challenges of Zn anodes such as the corrosion and ZnO densification have compromised their application in rechargeable Zn-based batteries. In this paper, a straightforward strategy is employed to facilitate the uniform Zn stripping/plating of the Zn anode through using a ZrO2 coating layer, which contributes to the controllable nucleation sites for Zn2+ and fast Zn2+ transportation through the favorable Maxwell-Wagner polarization. As a result, the low polarization (24 mV at 0.25 mA cm(-2)), high Coulombic efficiency (99.36% at 20 mA cm(-2)), and long cycle life (over 3800 h at 0.25 mA cm(-2)) can be obtained for the ZrO2-coated Zn anode. It is believed that the ZrO2 coating layer can also act as an inert physical barrier to decrease the contact of the anode and electrolyte, thus reducing both the Zn corrosion and formation of ZnO densification, and then improve the reversibility of Zn anode. The results demonstrated in this work provide an appealing strategy for the future development of rechargeable Zn-based batteries.
机译：锌水电池由于其几个优点而引起了极大的关注。但是，锌阳极的挑战（例如腐蚀和ZnO致密化）损害了它们在可充电Zn基电池中的应用。在本文中，采用了一种简单的策略来通过使用ZrO2涂层来促进锌阳极的均匀Zn剥离/镀层，这有助于通过有利的Maxwell-Wagner极化作用控制Zn2 +的成核位点和快速的Zn2 +传输。结果是低极化（0.25 mA cm（-2）时为24 mV），高库仑效率（20 mA cm（-2）时为99.36％）和长循环寿命（0.25 mA cm（-时超过3800 h） 2））可获得用于ZrO2涂层的Zn阳极。据信，ZrO 2涂层还可以充当惰性的物理屏障，以减少阳极与电解质的接触，从而减少Zn腐蚀和ZnO致密化的形成，然后改善Zn阳极的可逆性。这项工作中展示的结果为可充电锌基电池的未来发展提供了一种有吸引力的策略。

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