3D Porous Metal–Organic Skeleton Based on Polyoxometalate Nanoclusters as an Anode in a Lithium-Ion Battery

Basket-like polyoxometalate (POM) nanoclusters possess bulky space barriers and limited coordination active sites; therefore, it is difficult for them to bond with functional metal–organic building units to construct porous materials. To overcome this bottleneck, we adopt a dual-ligand strategy to anchor basket-like POM nanoclusters onto a Ag-pz metal–organic chain yielding a polyporous hybrid material, (H₄btb)[{Ag₄(H₂O)(pz)₅Cl}{H₂SrP₆Mo₁₈O₇₃}]·4H₂O (BAS-MOF-1). It is the first three-dimensional (3D) net with intersecting tunnels based on a unique double-layer structure composed of {P₆Mo₁₈O₇₃} nodes and Ag-pz chains. As an anode for a Li-ion battery (LIB), this material shows higher lithiation capacity, stability, and rate than zero-dimensional (0D) control compounds, which can be ascribed to the superior redox ability of basket-like POMs and stable organic–inorganic porous structures.