Zhu Denglei, Li Jianxin, Ren Fengzhang, Liu Yong, Ren Jiangzhuo, Xiong Yi
School of Materials Science and Engineering, Provincial and Ministerial Co-construction of Collaborative Innovation Center for Non-ferrous Metal New Materials and Advanced Processing Technology, Henan University of Science and Technology, Luoyang 471023, China; School of Materials Science and Engineering, Anyang Institute of Technology, Anyang 455000, China.
School of Materials Science and Engineering, Anyang Institute of Technology, Anyang 455000, China.
J Colloid Interface Sci. 2023 Dec;651:504-513. doi: 10.1016/j.jcis.2023.07.171. Epub 2023 Jul 28.
As an important potential candidate for large-scale energy storage, rechargeable zinc metal batteries have become a research hotspot. Zn metal anodes are an extremely crucial component of rechargeable Zn metal batteries. However, the Zn dendrites, the evolution of hydrogen and side reactions on the surface of the Zn metal anodes severely hinder its commercial use. Here, we report a modified Zn metal anode with a layer of nitrogen-defective graphitic carbon nitride (NDCN) nanosheets coated onto a commercial Zn foil by a simple spraying method. The NDCN coating on the anode's surface not only provides zincophilic sites, but also drives the deposition of zinc with a particular crystallographic orientation. At the same time, the formation of zinc dendrites and the evolution of hydrogen were suppressed, which enhanced the reversibility of the anode. Thus, the symmetric cells with the NDCN-protected zinc foil (NDCN@Zn) electrodes remained stable for 2000 h at a current density of 5 mA cm. More importantly, the long-term cycling performance of the full cell tested at 1 A g retained approximately 88 % of its capacity even after 2300 cycles. This simple but effective method will provide a reference for future studies on protecting the anodes of zinc metal batteries.
作为大规模储能的重要潜在候选者，可充电锌金属电池已成为研究热点。锌金属负极是可充电锌金属电池极其关键的组成部分。然而，锌枝晶、锌金属负极表面的析氢和副反应严重阻碍了其商业应用。在此，我们报道了一种通过简单喷涂方法在商业锌箔上涂覆一层氮缺陷石墨相氮化碳（NDCN）纳米片的改性锌金属负极。负极表面的NDCN涂层不仅提供亲锌位点，还驱动具有特定晶体取向的锌沉积。同时，抑制了锌枝晶的形成和析氢，增强了负极的可逆性。因此，具有NDCN保护锌箔（NDCN@Zn）电极的对称电池在5 mA cm的电流密度下保持稳定2000小时。更重要的是，在1 A g下测试的全电池即使在2300次循环后仍保留约88%的容量。这种简单而有效的方法将为未来锌金属电池负极保护的研究提供参考。
