Synthesis, Characterization and Electrochemical Properties of Mesoporous Maghemite γ-Fe2O3

Volodymyr Kotsyubynsky; Bogdan Ostafiychuk; Volodymyr Moklyak; Andrii Hrubiak

doi:10.4028/www.scientific.net/SSP.230.120

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HomeSolid State PhenomenaSolid State Phenomena Vol. 230Synthesis, Characterization and Electrochemical...

Synthesis, Characterization and Electrochemical Properties of Mesoporous Maghemite γ-Fe₂O₃

Abstract:

Mesoporous maghemite γ-Fe₂O₃ was obtained by thermal decomposition of iron citrate xerogel hydrate. The influence of precursor molar concentration and calcination temperature on the material phase composition, morphology, crystalline and magnetic microstructure, surface condition and optical properties was studied. The model of mesoporous γ-Fe₂O₃ formation is proposed. Obtained maghemite was tested as cathode material for lithium power sources. Increase of lithium power sources specific capacity and energy with the samples specific surface area enlarging is determined. Two kinetic processes are observed during discharge processes: lithium accumulation at the cathode material/electrolyte interface and diffusion of lithium ions into the material crystal structure. The diffusion coefficients of lithium in the cathode material on the different stages of discharge process are calculated.

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Solid State Phenomena (Volume 230)

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120-126

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https://doi.org/10.4028/www.scientific.net/SSP.230.120

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June 2015

Authors:

Volodymyr Kotsyubynsky*, Bogdan Ostafiychuk, Volodymyr Moklyak, Andrii Hrubiak

Keywords:

Intercalation, Lithium Power Sources, Mesoporous Maghemite γ-Fe₂O₃, Superparamagnetic

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References

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