This technology features an anode electrode coated with a composite protective layer consisting of a UiO-66-based zirconium metal-organic framework (MOF) and a binder on the surface of a metal plate, such as zinc. The protective layer ensures uniform metal ion deposition and provides physical and chemical encapsulation to control dendrite growth.
In zinc-metal batteries, metal ions accumulate unevenly on the surface during charge and discharge cycles, leading to the growth of tree-like dendrites. These dendrites can pierce the separator, causing internal short circuits and reducing the cycle life and safety of the battery.
This technology uses the regular pores of the Zr-MOF to uniformly disperse the flow of zinc ions. The high ionic conductivity and adhesion of the hydrophilic organic linker and binders like PVDF-HFP lower interfacial resistance while firmly securing the protective layer. The weight ratio of MOF to binder is adjusted between 9:1 and 5:5, with an optimal ratio of approximately 8:2, achieving an ion transference number of 0.2 or higher and a wettability contact angle of less than 90°. Applicable to aqueous zinc-ion batteries, large-capacity ESS, and lithium, sodium, or magnesium metal anodes, it reduces the risk of internal short circuits and enables long-life operation for non-flammable aqueous batteries.
This invention was developed with support from the Ministry of Science and ICT for the development of high-voltage macrocyclic organic cathode materials for aqueous zinc secondary batteries.
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