Highly Reversible Zn Anode Enabled by Controllable Formation of Nucleation Sites for Zn-Based Batteries
Highly Reversible Zn Anode Enabled by Controllable Formation of Nucleation Sites for Zn-Based Batteries
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DOI：
10.1002/adfm.201908528
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发表时间：
2020-02-13
影响因子：
19
通讯作者：
Zhang, Jiujun
中科院分区：
文献类型：
--
作者：
Liang, Pengcheng;Yi, Jin;Zhang, Jiujun
水溶液锌电池因其诸多优点而引起了人们的极大关注。然而，锌阳极的挑战，如腐蚀和ZnO致密化已经损害了它们在可充电锌基电池中的应用。在本文中，一个简单的策略，以促进均匀的锌剥离/电镀的锌阳极，通过使用ZrO 2涂层，这有助于可控的成核位点的Zn 2+和快速Zn 2+的运输通过有利的麦克斯韦-瓦格纳极化。结果表明，ZrO_2涂层锌阳极具有低极化（0.25 mA cm ~（-2））（24 mV）、高库仑效率（20 mA cm ~（-2））（99.36%）和长循环寿命（0.25 mA cm ~（-2））（3800 h以上）。认为ZrO 2涂层还可以作为惰性物理屏障，减少阳极与电解液的接触，从而既减少Zn的腐蚀又减少ZnO致密化的形成，进而提高Zn阳极的可逆性。在这项工作中所展示的结果提供了一个有吸引力的战略，为未来的发展，可充电锌基电池。
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.