A scalable bio-inspired polydopamine-Cu ion interfacial layer for high-performance lithium metal anode
polydopamine, Cu ions, interfacial layer, lithium metal anode
The growth of Li dendrites and the instability of the solid electrolyte interphase (SEI) layer during plating/stripping has hindered the practical application of high-energy-density batteries based on a lithium metal anode. Building a stable interfacial layer is effective in preventing lithium corrosion by the electrolyte and controlling the deposition of lithium metal. Here, we present a robust polydopamine-Cu ion (PDA-Cu2+) coating layer formed by the aggregation of nanoparticles and Cu ions, which can be obtained by a subtle immersion strategy. We demonstrate that the PDA-Cu2+ protective layer, with a unique structure comprising nanoparticles, can regulate and guide Li metal deposition, and together with Cu ions, forms a lubricating surface to facilitate uniform Li ion diffusion and induce stable SEI layer formation. Li anodes with this PDA-Cu2+ layer modification ultimately achieve higher Coulombic efficiencies, which are consistently stable for over 650 cycles at 0.5 mA·cm−2 without Li dendrites. The introduced PDA-Cu2+ coating can adhere to any material of any shape; additionally, the operation can be realized on a large scale because of its simplicity. These merits provide a promising approach for developing stable and safe lithium metal batteries.
Tsinghua University Press
Qianqian Meng,Huimin Zhang,Yue Liu,Shaobo Huang,Tianzhu Zhou,Xiaofei Yang,Biyan Wang,Wenfeng Zhang,Hai Ming,Yu Xiang,Meng Li,Gaoping Cao,Yaqin Huang,Li-zhen Fan,Hao Zhang,Yuepeng Guan, A scalable bio-inspired polydopamine-Cu ion interfacial layer for high-performance lithium metal anode. NanoRes.2019, 12(12): 2919–2924