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

0352264 - ÚFCH JH 2011 RIV US eng C - Konferenční příspěvek (zahraniční konf.)
Kavan, Ladislav - Exnar, I. - Graetzel, M.
Promoting the activity of LiFePO4 (olivine) cathode of Li-ion battery by supramolecular complexes with single walled carbon nanotubes.
NANOTECH CONFERENCE & EXPO 2009. Boca Raton: CRC PRESS-TAYLOR & FRANCIS GROUP, 2009, s. 58-61. ISBN 978-1-4398-1784-1.
[NANOTECH CONFERENCE & EXPO 2009. Houston (US), 03.05.2009-07.05.2009]
Grant CEP: GA MŠMT LC510; GA AV ČR IAA400400804; GA AV ČR KAN200100801
Výzkumný záměr: CEZ:AV0Z40400503
Klíčová slova: olivine cathode * carbon electrode * Li-ion battery
Kód oboru RIV: CG - Elektrochemie

The amphiphilic Ru-bipyridine complex, Z-907Na acts as a surfactant for solubilization of single walled carbon nanotubes (SWNTs) in acetonitrile+t-butanol. The supramolecular assembly Z-907Na/SWNT was characterized by optical and Raman spectro/electrochemistry. Its redox potential of 3.5 V vs. Li/Li+ is matching almost exactly the formal potential of LiFePO4/FePO4 couple. The Z-907Na/SWNT assembly 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 Z-907Na. Electrodes fabricated from Z-907Na/SWNT/LiFePO4 composite exhibited greatly enhanced activity for electrochemical Li+ extraction/insertion compared to the performance of electrodes made from pure LiFePO4.
Trvalý link: http://hdl.handle.net/11104/0191810