Nanohybridization of Keggin polyoxometalate clusters and reduced graphene oxide for lithium-ion batteries

The nanocomposites of reduced graphene oxide (RGO) and polyoxometalates (POMs) have been considered to be effective to boost more Li(+) to participate in intercalation/deintercalation process of lithium-ion batteries (LIBs). In this paper, a nanocomposite (PMo(12)@RGO-AIL) with electrostatic interaction of RGO and Keggin-type [PMo(12)O(40)](3−) has been fabricated and characterized by XRD, XPS, SEM, and TEM. To prepare PMo(12)@RGO-AIL, a strategy of covalent modification is developed between amino-based ionic liquid and RGO, helping to achieve the uniform dispersion of [PMo(12)O(40)](3−). When the PMo(12)@RGO-AIL was used as a cathode for LIBs, it could exhibit more excellent reversible capacity, cycle stability, and rate capability than those of samples without modifying by ionic liquids. SUPPLEMENTARY INFORMATION: The online version contains supplementary material available at 10.1007/s11051-020-05108-x.