GROULT, Henri; NAKAJIMA, Tsuyoshi; PERRIGAUD, Laurent; WARMONT, Fabienne; OHZAWA, Yoshimi; BADDOUR-HADJEAN, Rita; TRESSAUD, A.; JULIEN, Christian

doi:10.1149/1.2795118

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GROULT, Henri
Liquides Ioniques et Interfaces Chargées [LI2C]

NAKAJIMA, Tsuyoshi
Aichi Institute of Technology [AIT]

PERRIGAUD, Laurent
Liquides Ioniques et Interfaces Chargées [LI2C]

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ECS Transactions. 2007, vol. 3, n° 36, p. 167-176

Electrochemical Society, Inc.

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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.< Leer menos

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

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