Low Voltage Behavior of Lithium/Metal Dichalcogenide Topochemical Cells

This is the authors' abstract. We don't add key points for this paper.

The formation of Li 2 VX 2 ( X = S , Se ) in Li/Li + , propylene carbonate ( PC ) / LiVX 2 cells occurs near 1.0V. The selenide, Li 2 VSe 2 , has been previously described. Magnetic susceptibility and x‐ray powder diffraction data are presented for Li 2 VS 2 . The LiVX 2 / Li 2 VX 2 couples are reversible and two phase between the limiting compositions. The selenide is reversible over the range VSe 2 to Li 2 VSe 2 , but the sulfide deteriorates if not confined to the LiVS 2 / Li 2 VS 2 couple. TiS 2 has a similar voltage profile near 0.5V assigned to the LiTiS 2 / Li 2 TiS 2 couple, which appears to be reversible, but is accompanied by either side reaction with the electrolyte or slow decomposition of Li 2 TiS 2 .