Zhang Nannan, Huang Shuo, Yuan Zishun, Zhu Jiacai, Zhao Zifang, Niu Zhiqiang
Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), Renewable Energy Conversion and Storage Center, College of Chemistry, Nankai University, Tianjin, 300071, P. R. China.
Angew Chem Int Ed Engl. 2021 Feb 8;60(6):2861-2865. doi: 10.1002/anie.202012322. Epub 2020 Dec 8.
Metallic zinc is a promising anode candidate of aqueous zinc-ion batteries owing to its high theoretical capacity and low redox potential. However, Zn anodes usually suffer from dendrite and side reactions, which will degrade their cycle stability and reversibility. Herein, we developed an in situ spontaneously reducing/assembling strategy to assemble a ultrathin and uniform MXene layer on the surface of Zn anodes. The MXene layer endows the Zn anode with a lower Zn nucleation energy barrier and a more uniformly distributed electric field through the favorable charge redistribution effect in comparison with pure Zn. Therefore, MXene-integrated Zn anode exhibits obviously low voltage hysteresis and excellent cycling stability with dendrite-free behaviors, ensuring the high capacity retention and low polarization potential in zinc-ion batteries.
金属锌因其高理论容量和低氧化还原电位，是水系锌离子电池阳极的一个有前景的候选材料。然而，锌阳极通常会受到枝晶和副反应的影响，这会降低其循环稳定性和可逆性。在此，我们开发了一种原位自发还原/组装策略，在锌阳极表面组装一层超薄且均匀的MXene层。与纯锌相比，MXene层通过有利的电荷重新分布效应，赋予锌阳极更低的锌成核能垒和分布更均匀的电场。因此，集成MXene的锌阳极表现出明显较低的电压滞后和具有无枝晶行为的优异循环稳定性，确保了锌离子电池中的高容量保持率和低极化电位。
