Improved Capacity Retention for LiVO2by Cr Substitution

We present a layered Li-intercalation oxide that operates on the V 3+ /V 4+ redox couple.The stabilization effect of adding a +3 element into the layered LiVO 2 has been studied by first principles calculations.We identified Cr substitution into LiVO 2 to be promising for stabilizing a layered material based on the V redox couple.Layered LiCr x V 1-x O 2 (x = 0.1, 0.2, 0.4, 0.5) has been synthesized and tested electrochemically.The improved capacity retention confirms that the structural stability of delithiated LiVO 2 is improved by Cr doping.