NAKAJIMA, Tsuyoshi; SHIBATA, Seiko; NAGA, Kazuhisa; OHZAWA, Yoshimi; TRESSAUD, Alain; DURAND, Etienne; GROULT, Henri; WARMONT, Fabienne

doi:10.1016/j.jpowsour.2007.03.008

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NAKAJIMA, Tsuyoshi
Department of Applied Chemistry

SHIBATA, Seiko
Department of Applied Chemistry

NAGA, Kazuhisa
Department of Applied Chemistry

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Journal of Power Sources. 2007, vol. 168, n° 1, p. 265-271

Elsevier

Résumé en anglais

Plasma-fluorination of petroleum coke and those heat-treated at 1860, 2300 and 2800 °C (abbreviated to PC, PC1860, PC2300 and PC2800) was conducted for 15, 30 and 60 min using CF4 gas at 90 °C. Fluorine contents obtained by elemental analysis were negligible except PC fluorinated for 60 min (0.7 at.%). Fluorine concentration on the surface decreased with increasing heat-treatment temperature of petroleum coke, i.e. from PC to PC2800 when plasma-fluorination was made for 30 and 60 min. Transmission electron microscopic observation revealed that the closed edges of PC2800 were destroyed and opened by plasma-treatment. Plasma-fluorination increased surface disorder of heat-treated petroleum cokes, however, slightly reduced surface areas. These surface structure changes increased first coulombic efficiencies of PC2300 and PC2800 by 6–8 and 8–10% at both 60 and 150 mA g−1, respectively.< Réduire

Mots clés en anglais

Plasma-fluorination

Surface modification

Carbon anode

Lithium ion battery

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Surface structure and electrochemical characteristics of plasma-fluorinated petroleum cokes for lithium ion battery

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