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Encapsulating the ionic liquids into POM-based MOFs to improve their conductivity for superior lithium storage

Abstract

Developing advanced anode materials with multi-electron reaction, adequate charge transport, and suppressed volume changes is highly desirable in Lithium storage. Polyoxometalates (POMs) have the strong multi-electron redox properties and metal-organic frameworks (MOFs) possess high surface areas and controllable porosities, both of which are attractive candidates for the anode materials. However, the easy dissolution of POMs in the electrolyte and the intrinsically poor conductivity of MOFs result in the inferior rate performance and cycling capacity. In this paper, we skillfully encapsulate ionic liquids (ILs) into polyoxometalate-based metal-organic frameworks (POMOFs) to fabricate a series of ILs-functionalized POMOFs crystals (denoted as POMs-ILs@MOFs), which immobilize POMs in the cage of MOFs avoiding the leaching of POMs and obtain an enhanced conductivity by the modification of the ILs. One of POMs-ILs@MOFs (PMo10V2-ILs@MIL-100) crystals show superior cycling stability and high rate capability when they are used as anode materials, which are the best amongst all the reported MOFs and POMs crystals materials. The outstanding performances are attributed to the hybrid behavior of a battery-supercapacitor, which is a synergistic effect among ILs, POMs, and MOFs. And most importantly, we not only discover a series of new anode materials but also propose a new strategy to improve the conductivity of MOFs and POMOFs, which would guide the development of other electrode materials based on MOFs and POMOFs for Lithium storage.

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Publication details

The article was received on 01 Feb 2018, accepted on 09 Apr 2018 and first published on 11 Apr 2018


Article type: Paper
DOI: 10.1039/C8TA01062E
Citation: J. Mater. Chem. A, 2018, Accepted Manuscript
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    Encapsulating the ionic liquids into POM-based MOFs to improve their conductivity for superior lithium storage

    Y. Lan, M. Zhang , A. Zhang, X. Wang, Q. Huang, X. Zhu, X. Wang, L. Dong and S. Li, J. Mater. Chem. A, 2018, Accepted Manuscript , DOI: 10.1039/C8TA01062E

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