LITHIUM INTERCALATION INTO THE TETRADYMITE-TYPE SELENIDES BI2-XINXSE3

Electrochemical intercalation of Li+ ions into Bi2-xInxSe3 crystals (x = 0.0, 0.01, 0.22 and 0.46) has been studied. According to the cyclic voltammograms obtained during the first charge-discharge cycle, the a mount C of intercalated Li+ ions depends on the concentration x of In in the crystals; maximum intercalation was observed for the crystals w ith x=0.01. The observed dependence of C = f(x) is similar to the conc entration dependences of the Hall coefficient, electric conductivity a nd Seebeck coefficient, that is to the dependence of the concentration of free charge carriers on the concentration of In in the crystals. F rom an analysis of the relations between intercalation properties and the nature of point defects in Bi2-xInxSe3 crystals it was concluded t hat changes in the concentration of Se vacancies V-Se(..) are responsi ble for the observed changes in the intercalation properties of the: B i2-xInxSe3 crystals.