NAKAJIMA, Tsuyoshi; GUPTA, Vinay; OHZAWA, Yoshimi; KOH, Meiten; SINGH, Ram Niwas; TRESSAUD, Alain; DURAND, Etienne

doi:10.1016/S0378-7753(01)00895-3

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NAKAJIMA, Tsuyoshi
Department of Applied Chemistry

GUPTA, Vinay
Department of Applied Chemistry

OHZAWA, Yoshimi
Department of Applied Chemistry

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Ce document a été publié dans

Journal of Power Sources. 2002, vol. 104, n° 1, p. 108-114

Elsevier

Résumé en anglais

Electrochemical properties of plasma-fluorinated graphite samples have been investigated in 1 mol dm−3 LiClO4 ethylene carbonate (EC)/diethyl carbonate (DEC) solution at 25 °C. Fluorine contents in plasma-fluorinated graphite samples were in the range of 0-0.3 at.% by elemental analysis and surface fluorine concentrations obtained by X-ray photoelectron spectroscopy (XPS) were in the range of 3-12 at.%. Raman spectroscopy revealed that surface disordering of graphite was induced by plasma fluorination. Plasma treatment increased the surface areas of graphite samples by 26-55% and the pore volumes for the mesopores with diameters of 1.5-2 and 2-3 nm. Plasma-fluorinated graphites showed capacities higher than those of original graphites and even higher than the theoretical capacity of graphite, 372 mAh g−1, without any change of the profile of charge-discharge potential curves. The increments in the capacities were approximately 5, 10 and 15% for graphites with average particle diameters, 7, 25 and 40 μm, respectively. Furthermore, the coulombic efficiencies in first cycle were nearly the same as those for original graphites or higher by several percents.< Réduire

Mots clés en anglais

Plasma fluorination

Surface modification

Graphite electrode

Lithium ion battery

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Electrochemical behavior of plasma-fluorinated graphite for lithium ion batteries

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