Li Bin, Xue Jing, Han Chao, Liu Na, Ma Kaixuan, Zhang Ruochen, Wu Xianwen, Dai Lei, Wang Ling, He Zhangxing
School of Chemical Engineering, North China University of Science and Technology, Tangshan 063009, PR China.
School of Chemistry and Chemical Engineering, Jishou University, Jishou 416000, PR China.
J Colloid Interface Sci. 2021 Oct;599:467-475. doi: 10.1016/j.jcis.2021.04.113. Epub 2021 Apr 24.
In aqueous zinc-ion batteries, metallic zinc is widely used as an anode because of its non-toxicity, environmental benignity, low cost, high abundance and theoretical capacity. However, growth of zinc dendrites, corrosion of zinc anode, passivation, and occurrence of side reactions during continuous charge-discharge cycling hinder development of zinc-ion batteries. In this study, a simple strategy involving application of a HfO coating was used to guide uniform deposition of Zn to suppress formation of zinc dendrites. The HfO-coated zinc anode improves electrochemical performance compared with bare Zn anode. Therefore, for zinc-zinc symmetric cells, zinc anode with HfO coating (48 mV) shows lower voltage hysteresis than that of bare Zn anode (63 mV) at a current density of 0.4 mA cm. Moreover, cell with HfO coating also shows good cycling performance in Zn-MnO full cells. At a constant current density of 1.0 A g, discharge capacity of bare Zn-MnO full cell is only 37.9 mAh g after 500 cycles, while that of Zn@HfO-MnO full cell is up to 78.3 mAh g. This good electrochemical performance may be the result of confinement effect and reduction of side reactions. Overall, a simple and beneficial strategy for future development of rechargeable aqueous zinc-ion batteries is provided.
在水系锌离子电池中，金属锌因其无毒、环境友好、成本低、储量丰富和理论容量高而被广泛用作阳极。然而，在连续充放电循环过程中，锌枝晶的生长、锌阳极的腐蚀、钝化以及副反应的发生阻碍了锌离子电池的发展。在本研究中，采用了一种简单的策略，即应用HfO涂层来引导锌的均匀沉积，以抑制锌枝晶的形成。与裸锌阳极相比，HfO涂层的锌阳极提高了电化学性能。因此，对于锌-锌对称电池，在电流密度为0.4 mA cm时，涂覆HfO的锌阳极（48 mV）的电压滞后比裸锌阳极（63 mV）更低。此外，涂覆HfO的电池在锌-二氧化锰全电池中也表现出良好的循环性能。在1.0 A g的恒定电流密度下，裸锌-二氧化锰全电池在500次循环后的放电容量仅为37.9 mAh g，而锌@HfO-二氧化锰全电池的放电容量高达78.3 mAh g。这种良好的电化学性能可能是限制效应和副反应减少的结果。总体而言，为可充电水系锌离子电池的未来发展提供了一种简单且有益的策略。
