Vanadium disulfide: Metal substitution and lithium intercalation

The preparation and physical properties of the layered VS2, MyV1−yS2 (M = Fe or Cr), and their lithium intercalation adducts are described. These compounds were prepared by oxidative delithiation of LiMyV1−yS2 with iodine. Crystallographic distortions present in LixVS2 (0.25 ≲ x ≲ 0.6) are suppressed by Fe or Cr substitution for V. The electrochemical sluggishness of Li/Li+/VS2 cells is reduced by the substitution.