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Journal Article

Enhancement of electrochemical activity of LiFePO4 (olivine) by amphiphilic Ru-bipyridine complex anchored to a carbon nanotube

MPS-Authors

Cech,  J.
Max Planck Society;

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Graetzel,  M.
External Scientific Members, Max Planck Institute for Solid State Research, Max Planck Society;
Max Planck Fellows, Max Planck Institute for Solid State Research, Max Planck Society;

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Citation

Kavan, L., Exnar, I., Cech, J., & Graetzel, M. (2007). Enhancement of electrochemical activity of LiFePO4 (olivine) by amphiphilic Ru-bipyridine complex anchored to a carbon nanotube. Chemistry of Materials, 19(19), 4716-4721.


Cite as: https://hdl.handle.net/21.11116/0000-000E-B6D7-2
Abstract
Single walled carbon nanotubes (SWNTs) were dissolved in an acetonitrile + tert-butanol mixture, using the amphiphilic Ru-bipyridine complex NaRu(4-carboxylic acid-4'-carboxylate)(4,4'-dinonyl-2,2'bipyridine)(NCS)(2) as a surfactant. The assembly of the SWNT/Ru-bipyridine complex was adsorbed on the surface of LiFePO4 (olivine), providing a material with approximately monolayer coverage by the Ru-bipyridine complex and ca. 0.04 wt % of SWNT. Electrodes fabricated from the surface-derivatized LiFePO4 exhibited greatly enhanced activity for electrochemical Li+ extraction/insertion compared to electrodes from commercial carbon-coated LiFePO4 or from LiFePO4 derivatized either by adsorption of sole Ru-bipyridine complex or by carbon nanotubes dispersed with the redox inactive pyrene butanoic acid. The SWNT backbone promotes the interfacial charge transfer between LiFePO4 and the Ru-complex, whose redox potentials closely match each other. The nanotube-mediated redox wiring of virtually insulating electrode materials such as LiFePO4 presents a novel strategy for application in high-energy lithium-ion batteries.