The temperature influence on the diffusion coefficient for lithium in graphite was investigated. The activation energy for lithium diffusion in graphite was calculated to be 35kJ/mol.

Temperature Effect on the Lithium Diffusion Rate in Graphite. Kulova, T.L., Skundin, A.M., Nizhnikovskii, E.A., Fesenko, A.V.: Russian Journal of Electrochemistry, 2006, 42[3], 259-62