Lithium Secondary Battery Using Monoclinic NbS3 Prepared under High Pressure

Monoclinic NbS/sub 3/ prepared under high pressure was used as the cathode in a lithium secondary battery. In the first discharge, the cell showed an almost constant voltage of ca. 1.8V until the discharge capacity corresponding to the uptake of 1.7 Li per NbS/sub 3/ was achieved. In constant current cycling carried out between 2.7 and 1.5V, this cell had a larger discharge capacity than that using triclinic NbS/sub 3/ prepared by a conventional method. The capacity difference was 0.2-0.3 Li per NbS/sub 3/. X-ray diffractometry of monoclinic NbS/sub 3/ cathode after 120 cycles suggested an accumulation of intercalated lithium in the NbS/sub 3/. The cell was also rechargeable in the compositional range of x=2-3 Li/sub x/NbS/sub 3/.