Lu Haiying, Liu Liyang, Zhang Jiakui, Xu Jiantie
School of Environment and Energy, National Engineering Laboratory for VOCs Pollution Control Technology and Equipment, Guangdong Provincial Key Laboratory of Atmospheric Environment and Pollution Control, South China University of Technology, Guangzhou 510640, China.
School of Environment and Energy, National Engineering Laboratory for VOCs Pollution Control Technology and Equipment, Guangdong Provincial Key Laboratory of Atmospheric Environment and Pollution Control, South China University of Technology, Guangzhou 510640, China; Institute for Superconducting and Electronic Materials, Australian Institute for Innovative Materials, University of Wollongong, Wollongong, NSW 2522, Australia.
J Colloid Interface Sci. 2022 Jul;617:422-429. doi: 10.1016/j.jcis.2022.03.010. Epub 2022 Mar 4.
Rechargeable aqueous Zn ion batteries have been regarded as one of the most promising candidates for next-generation energy storage devices due to their low cost, non-toxicity and high safety. However, the dendrite growth of Zn anode and severe undesired side-reactions largely limited their practical application. Here, we developed a bismuth (Bi)-PVDF layer with unique 3D cross-linked and branch-liked structures as a protective layer on the Zn surface (Zn@Bi-PVDF) to suppress the formation of Zn dendrites and side-reactions, leading to the uniform plating and stripping of Zn during the cycles. Consequently, the symmetric cell with Zn@Bi-PVDF electrodes exhibits long cycling life over 2400 h at a current density of 1 mA cm with a fixed capacity of 1 mAh cm. When the Zn@Bi-PVDF anode is paired with a NaVO·1.5HO (NVO) cathode, the fabricated Zn@Bi-PVDF//NVO cell maintains a high reversible capacity of 175.5 mAh g at 1 A g after 500 cycles with an initial capacity retention of 64.1%.
由于成本低、无毒且安全性高，可充电水系锌离子电池被认为是下一代储能设备最有前景的候选者之一。然而，锌阳极的枝晶生长和严重的不良副反应在很大程度上限制了它们的实际应用。在此，我们在锌表面（Zn@Bi-PVDF）开发了一种具有独特三维交联和分支状结构的铋（Bi）-聚偏氟乙烯层作为保护层，以抑制锌枝晶的形成和副反应，从而在循环过程中实现锌的均匀沉积和剥离。因此，具有Zn@Bi-PVDF电极的对称电池在1 mA cm的电流密度和1 mAh cm的固定容量下表现出超过2400小时的长循环寿命。当Zn@Bi-PVDF阳极与NaVO·1.5HO（NVO）阴极配对时，制备的Zn@Bi-PVDF//NVO电池在500次循环后，在1 A g下保持175.5 mAh g的高可逆容量，初始容量保持率为64.1%。
