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Article Dans Une Revue ECS Transactions Année : 2007

Surface modification of carbonaceous materials by fluorinated gases and use as anode in lithium-ion battery

Résumé

The electrochemical performances of raw and surface- fluorinated graphite powders used as anode in Li-ion battery have been studied. The fluorination obtained from F2 gas mainly concerns the surface of the particles for TF2≤300 {degree sign}C. For higher temperature, important modifications of the bulk structure were observed. When they are used as anode in Li-ion battery, fluorinated graphite powders exhibit better electrochemical performances than raw graphite notably due to an increase of the surface area and surface defects which allow the storage of a higher amount of lithium into the host lattice. These results have been confirmed by impedance measurements performed in delithiated state: a drastic decrease of both the charge transfer resistance and the resistance related to the SEI layer was observed for TF2 lower than 300 {degree sign}C.
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hal-00165334 , version 1 (29-10-2021)

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Henri Groult, Tsuyoshi Nakajima, Laurent Perrigaud, Fabienne Warmont, Yoshimi Ohzawa, et al.. Surface modification of carbonaceous materials by fluorinated gases and use as anode in lithium-ion battery. ECS Transactions, 2007, 3 (36), pp.167-176. ⟨10.1149/1.2795118⟩. ⟨hal-00165334⟩
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