Electrochemical properties and structures of surface-fluorinated graphite for the lithium ion secondary battery

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 (rf) plasma fluorination. Both methods give rise to an enlargement of the surface areas of graphite samples and a change of the pore volume distribution. The capacities of surface-fluorinated graphite samples are higher than those of original samples and even more than the theoretical capacity of graphite, 372 mAh g−1, without any reduction of the first colombic efficiencies. The increments of the capacities are ∼5, 10, and 15% for graphite samples with average particle diameters of 7, 25 and 40 μm, respectively.

Mots clés: Surface modification; Surface fluorination; Electrochemical property; Lithium ion battery; Graphite electrode

Domaines: Matériaux

Tsuyoshi Nakajima, Vinay Gupta, Yoshimi Ohzawa, Hiroyuki Iwata, Alain Tressaud, et al.. Electrochemical properties and structures of surface-fluorinated graphite for the lithium ion secondary battery. Journal of Fluorine Chemistry, 2002, 114 (2), pp.209-214. ⟨10.1016/S0022-1139(02)00028-3⟩. ⟨hal-00818422⟩