Laboratoire de Physique des Solides de l'Université Pierre et Marie Curie, 4 place Jussieu, 75252, Paris Cedex 75, France
Abstract:
The lithium intercalation into the layered dichalcogenide 3R-WS2 has been investigated by electrochemical reduction and by chemical reaction in n-butyl lithium solution. Essential results are (a) a charge transfer of nearly 0.6e−/W in LixWS2, (b) a small increase of the c-axis parameter of about 0.6%, and (c) a high mobility of the Li+-ions. The chemical diffusion coefficient of Li+-ions is estimated to be 8 × 10−9 cm2 s−1 in the composition range 0 ≤ x ≤ 0.25. The appearance of a structural transformation from 3R-WS2 to 2H-LixWS2 is interpreted on grounds of instabilities in the interlayer structure.