Journal
CHEMISTRY-A EUROPEAN JOURNAL
Volume 21, Issue 17, Pages 6469-6474Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201500218
Keywords
carbon nanotubes; covalent modification; electrochemistry; lithium ion batteries; polyoxometalates
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Funding
- National Basic Research Program of China (973 program) [2014CB932104]
- National Science Foundation of China [21222104]
- Fundamental Research Funds for the Central Universities [RC1302, YS1406]
- Beijing Engineering Center for Hierarchical Catalysts
- Deutsche Forschungsgemeinschaft(DFG) [STR1164/4-1]
- Ulm University
- Deutscher Akademischer Austauschdienst (DAAD)
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Single-walled carbon nanotubes (SWNTs) covalently functionalized with redox-active organo-modified polyoxometalate (POM) clusters have been synthesized and employed as electrode materials in lithium ion batteries. The Anderson cluster [MnMo6O24](9-) is functionalized with Tris (NH2C(CH2OH)(3)) moieties, giving the new organic-inorganic hybrid [N(nC(4)H(9))(4)](3)[MnMo6O18{(OCH2)(3)CNH2}(2)]. The compound is then covalently attached to carboxylic acid-functionalized SWNTs by amide bond formation and the stability of this nanocomposite is confirmed by various spectroscopic methods. Electrochemical analyses show that the nanocomposite displays improved performance as an anode material in lithium ion batteries compared with the individual components, that is, SWNTs and/or Anderson clusters. High discharge capacities of up to 932mAhg(-1) at a current density of 0.5mAcm(-2) can be observed, together with high long-term cycling stability and decreased electrochemical impedance. Chemisorption of the POM cluster on the SWNTs is shown to give better electrode performance than the purely physisorbed analogues.
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