3D Porous Metal–Organic Skeleton Based on Polyoxometalate Nanoclusters as an Anode in a Lithium-Ion Battery
Shuang Sun, Liping Cui, Kai Yu, Meilin Wang, Jinghua Lv, Shuanghong Ge, Baibin Zhou
Abstract
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, (H 4 btb)[{Ag 4 (H 2 O)(pz) 5 Cl}{H 2 SrP 6 Mo 18 O 73 }]·4H 2 O ( BAS-MOF-1 ). It is the first three-dimensional (3D) net with intersecting tunnels based on a unique double-layer structure composed of {P 6 Mo 18 O 73 } 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.