Khamsanga Sonti, Uyama Hiroshi, Nuanwat Weerapong, Pattananuwat Prasit
Department of Materials Science, Faculty of Science, Chulalongkorn University, Bangkok, 10330, Thailand.
Department of Applied Chemistry, Graduate School of Engineering, Suita, Osaka, 565-0871, Japan.
Sci Rep. 2022 May 23;12(1):8689. doi: 10.1038/s41598-022-12657-9.
Metallic zinc (Zn) anode has been received a great promise for aqueous rechargeable zinc-ion batteries (ZIBs) due to its intrinsic safety, low cost, and high volumetric capacity. However, the dendrite formation regarding the surface corrosion is the critical problems to achieve the high performance and the long lifespans of ZIBs. Here, we purpose the facile cyclic voltammetry deposition of polypyrrole/reduced graphene oxide (PPy/rGO) composites coated onto Zn 3D surface as Zn anode for ZIBs. As results, the deposited PPy/rGO layer demonstrates the homogeneous distribution covering onto Zn surface, effectively suppressing the formation of dendrite. Additionally, a symmetric cell of the PPy/rGO coated Zn remarkably enhances an electrochemical cycling with a low voltage hysteresis for zinc plating/stripping, which is superior to the pristine Zn cell. In addition, the deposited layer of PPy/rGO on Zn effectively improves the reactivity of electrochemically active surface area and the intrinsic electronic configurations, participating in extraction/intercalation of Zn ions and leading to enhance ZIBs performance. The coin cell battery of Zn-PPy/rGO//MnO can deliver a high initial discharge capacity of 325 mAh/g at 0.5A/g with a good cycling stability up to 50% capacity retention after 300 cycles. Thus, these achieved results of Zn-PPy/rGO//MnO battery with dendrite-free feature effectively enhance the life-performance of ZIBs and open the way of the designed coating composite materials to suppress dendrite issues.
金属锌（Zn）阳极因其本质安全性、低成本和高体积容量，在水系可充电锌离子电池（ZIBs）中展现出巨大潜力。然而，与表面腐蚀相关的枝晶形成是实现ZIBs高性能和长寿命的关键问题。在此，我们提出一种简便的方法，通过循环伏安法在锌三维表面沉积聚吡咯/还原氧化石墨烯（PPy/rGO）复合材料作为ZIBs的锌阳极。结果表明，沉积的PPy/rGO层均匀覆盖在锌表面，有效抑制了枝晶的形成。此外，PPy/rGO包覆的锌对称电池显著增强了锌电镀/剥离的电化学循环性能，且具有低电压滞后，优于原始锌电池。此外，在锌表面沉积的PPy/rGO层有效提高了电化学活性表面积的反应性和本征电子构型，参与锌离子的萃取/嵌入，从而提升了ZIBs的性能。Zn-PPy/rGO//MnO扣式电池在0.5A/g电流下可提供325 mAh/g的高初始放电容量，在300次循环后具有良好的循环稳定性，容量保持率高达50%。因此，Zn-PPy/rGO//MnO电池取得的这些无枝晶特性的成果有效地提高了ZIBs的寿命性能，并为设计抑制枝晶问题的涂层复合材料开辟了道路。
