Electrochemical investigations were carried out on coal pitch-based fibers which had been heat-treated at 2800C. The compositional variation of the chemical diffusion coefficient of Li at ambient temperatures was measured by using current-pulse relaxation and potential step chronoamperometric methods. Agreement to within an order of magnitude was found between the sets of Li diffusivities which were obtained by using the 2 methods. The diffusivities were of the order of 3 x 10-10cm2/s in essentially pure C, and decreased with increasing Li content. The diffusivities were between 10-11 and 10-12cm2/s in LixC6, when x was greater than 0.2.

T.Uchida, Y.Morikawa, H.Ikuta, M.Wakihara, K.Suzuki: Journal of the Electrochemical Society, 1996, 143[8], 2606-12