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Title: Enhanced potential of amorphous electrode materials: Case study of RuO 2
Authors: Delmer, O.
Balaya, P. 
Kienle, L.
Maier, J.
Issue Date: 4-Feb-2008
Citation: Delmer, O., Balaya, P., Kienle, L., Maier, J. (2008-02-04). Enhanced potential of amorphous electrode materials: Case study of RuO 2. Advanced Materials 20 (3) : 501-505. ScholarBank@NUS Repository.
Abstract: The excess free energy of amorphous RuO2 that occurs in Li cells with RuO2 cathodes was studied after a deep discharge/charge cycle. The 10μm sized RuO2 was obtained by heat treatment of 60 nm RuO2 at 800°C for 50 hr in air. The results show that the RuO2 phase obtained upon oxidation of the Ru/Li2O composite is an amorphous phase, while the nanocrystalline RuO2 is only formed upon electron beam exposure. A significantly curved discharge behavior of RuO2 for the effect of nanosize on the discharge/charge curves is observed at higher potential. It is found that for the large grain size of 10 μm, the discharge rate of C/20 is not sufficiently slow to reach thermodynamic equilibrium and leads to a potential of about 1.15 V.
Source Title: Advanced Materials
ISSN: 09359648
DOI: 10.1002/adma.200701349
Appears in Collections:Staff Publications

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