Promoting the activity of LiFePO4 (olivine) cathode of Li-ion battery by supramolecular complexes with single walled carbon nanotubes

	Clean Technology 2009 Chapter 5: Energy Storage, Fuel Cells and Hydrogen
	Promoting the activity of LiFePO4 (olivine) cathode of Li-ion battery by supramolecular complexes with single walled carbon nanotubes
Authors:	L. Kavan, I. Exnar, M. Graetzel
Affilation:	J. Heyrovsky Institute of Physical Chemistry, CZ
Pages:	163 - 166
Keywords:	Li-ion batteries, olivine FePO4, carbon nanotubes
Abstract:	The amphiphilic Ru-bipyridine complex, NaRu(4-carboxylic acid-4’-carboxylate-2, 2’bipyridine)(4,4’-dinonyl-2,2’bipyridine)(NCS)2 can be used as a surfactant for solubilization of single walled carbon nanotubes (SWNTs) in acetonitrile-t-butanol mixture. The Ru-complex represents a redox functionality of 3.5 V vs. Li/Li+, which is matching almost exactly the formal potential of LiFePO4/FePO4 couple. The supramolecular assembly of SWNT/Ru-bipyridine complex is adsorbed on the surface of LiFePO4 (olivine) via the free carboxylic groups at the bipyridine ligand. This provides a composite material with roughly monolayer coverage by the Ru-bipyridine complex. Electrodes fabricated from the Ru-complex/SWNT/LiFePO4 composite exhibited greatly enhanced activity for electrochemical Li+ extraction/insertion compared to the performance of electrodes made 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 are closely matching each other. The so called “nanotube wiring” effect is based on a synergic action of adsorbed redox-active molecule, which provides the interfacial charge transfer to the olivine surface and the SWNT, which transports charge to longer distances in the composite.

ISBN:	978-1-4398-1787-2
Pages:	412
Order:	Online/Mail/Fax Ordering Options
Indexes:	Keywords, Authors, Affiliations
Up

Join Us

Featured Events

2013 Asia Pacific Clean Energy Summit & Expo
(joint with 2013 Islands & Isolated Communities Congress)
Honolulu, Hawai'i, September 9-11, 2013

2013 Defense Energy Summit
Austin, TX, November 11-13, 2013

Cleantech 2014
(joint with TechConnect World)
Washington DC,June 15-19, 2014

"We've very much enjoyed being a member of CTSI. In addition to the many networking and conference opportunities, we've found the monthly newsletters to be the best consolidated source of clean technology industry information and updates on policy, grants and market intelligence."

- Patrick J. Piper, QM Power, Inc.

"Ener-G-Rotors is pleased to be a member of CTSI. CTSI has been very supportive of our efforts in clean technology, helping to connect us with key legislators, introducing us to contacts at the DOE, and providing opportunities to network with other clean technology companies."

- Michael Newell, Ener-G-Rotors, Inc.

"The Clean Technology and Sustainable Industries Organization brings together the world's most innovative companies to provide critical thinking and technology solutions to real-world challenges."

- Dr. Ray O Johnson, Senior Vice President and Chief Technology Officer, Lockheed Martin

Clean Technology 2009

Chapter 5: Energy Storage, Fuel Cells and Hydrogen

Promoting the activity of LiFePO4 (olivine) cathode of Li-ion battery by supramolecular complexes with single walled carbon nanotubes