Surface structure and electrochemical characteristics of graphite fluorinated by elemental fluorine and plasma treatment using CF4.

Tsuyoshi Nakajima (1) , Vinay Gupta (1) , Yoshimi Ohzawa (1) , Hiroyuki Iwata (2) , Alain Tressaud (3) , Etienne Durand (3)

1 Department of Applied Chemistry
2 Technical Research Center
3 ICMCB - Institut de Chimie de la Matière Condensée de Bordeaux

Surface modification of graphite powder has been performed by elemental fluorine and radiofrequency plasma fluorination. Both of the methods enlarge the surface areas of graphite samples and change their pore volume distribution. Surface-fluorinated graphite samples demonstrate the capacities higher than those of original samples and even the theoretical capacity of graphite, 372 mAhg-1 without reducing the first coulombic efficiencies. The increments of the capacities are sim5, sim10 and sim15% for graphite samples with average particle diameters of 7, 25 and 40 mum, respectively.

Mots clés: Electrode capacity; Electrochemical properties; Surface structure; Fluorination; Graphite; Electrode material; Lithium batteries; Secondary cell

Domaines: Matériaux

Tsuyoshi Nakajima, Vinay Gupta, Yoshimi Ohzawa, Hiroyuki Iwata, Alain Tressaud, et al.. Surface structure and electrochemical characteristics of graphite fluorinated by elemental fluorine and plasma treatment using CF4.. Molecular Crystals and Liquid Crystals, 2002, 388, pp.517-522. ⟨10.1080/713738879⟩. ⟨hal-00817755⟩