Solid-Solution-Based Metal Coating Enables Highly Reversible, Dendrite-Free Aluminum Anode

Coatings

Xuanpeng Wang¹  Chunhua Han²  Lishan Geng²  Ping Hu²  Kang Han²  Bo Hu²  Ming Li² 

[1] Hainan Institute, Wuhan University of Technology, Sanya 572025, China;State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, China;

关键词: aluminum-ion battery;    metal coating;    solid-solution alloy;    dendrite-free anode;   

DOI  :  10.3390/coatings12050661

来源: DOAJ

【 摘 要 】

Aluminum-ion batteries have attracted great interest in the grid-scale energy storage field due to their good safety, low cost and the high abundance of Al. However, Al anodes suffer from severe dendrite growth, especially at high deposition rates. Here, we report a simple strategy for constructing a highly reversible, dendrite-free, Al-based anode through directly introducing a solid-solution-based metal coating to a Zn foil substrate. Compared with Cu foil substrates and bare Al, a Zn foil substrate shows a lower nucleation barrier of Al deposition due to the intrinsic, definite solubility between Al and Zn. During Al deposition, a thin, solid-solution alloy phase is first formed on the surface of the Zn foil substrate and then guides the parallel growth of flake-like Al on Zn substrate. The well-designed, Zn-coated Al (Zn@Al) anode can effectively inhibit dendrite growth and alleviate the corrosion of the Al anode. The fabricated Zn@Al–graphite battery exhibits a high specific capacity of 80 mAh·g⁻¹ and an ultra-long lifespan over 10,000 cycles at a high current density of 20 A·g⁻¹ in low-cost molten salt electrolyte. This work opens a new avenue for the development of stable Al anodes and can provide insights for other metal anode protection.

【 授权许可】

Unknown