A family of polyoxometalate-resorcin[4]arene-based metal-organic materials: Assemblies, structures and lithium ion battery properties

摘要

Polyoxometalates (POMs) are alternative anode materials of lithium ion batteries (LIBs) for their reversible electrochemical redox behaviors and electron storage functions. To overcome the low conductivity and poor stability of the POMs, embedment of POMs into metal-organic hybrid complexes is a promising synthetic strategy. Here, we designed a family of copper-containing POM-resorcin[4]arene-based complexes supported by a resorcin[4]arene ligand (TPTR4A), copper cations and Keggin-type POMs, namely, [Cu-4(TPTR4A)(2)] [PMo12O40](OH)center dot 2DMA center dot H2O (1a), [Cu-4(TPTR4A)(2)][SiW12O40]center dot 2.5DMA (1b) and [Cu-4(TPTR4A)(2)][PW12O40] (OH)center dot 0.5DMA center dot 5H(2)O (1c) (DMA = N,N'-dimethylacetamide). To improve the conductivity of the complexes, composites 1a@GO-1c@GO were obtained through mechanical grinding of the complexes and graphene oxide (GO). Strikingly, they show high initial specific capacity and stability for LIBs. This work offered a strategy for application of the POM-based complexes as LIBs via combining POM-based complexes and RGO. (C) 2021 Elsevier B.V. All rights reserved.