Fabrication of redox-active polyoxometalates-based ionic crystals onto single-walled carbon nanotubes for high-performance anode materials of lithium-ion batteries
Polyoxometalates (POMs)-based molecular cluster battery has attracted wide interest due to their rich redox properties. To date, no studies on POM-based ionic crystals for LIBs was reported yet considering that the redox-active metals can be incorporated and finely tuned in the ionic crystals. Herein, the POM-based ionic crystal (denoted as Composite 1) was prepared for the first time by the complexation of the trinuclear acetate-bridged cobalt-containing macrocation ([Co3O(CH3CO2)6(C5H5N)3]+) with anionic [PMo12O40]3-. Further interaction of Composite 1 and single-walled carbon nanotubes (SWNTs) resulted in the formation of a novel Composite 1/SWNTs nanocomposite through a facile one-pot strategy, in which the Composite 1 clusters were uniformly grown onto the surface of SWNTs. The as-prepared Composite 1/SWNTs nanocomposite showed outstanding electrochemical performance as anode material of LIBs by delivering a storage capacity of 1012 mAh g-1 at 100 mA g-1 for 100 cycles. The results may open a new pathway for exploring novel anode materials of LIBs.