Electrochemical properties enhancement of spinel lithium nickel manganese oxide by secondary heat treatment and assistant phase formation

Abstract

LiNi_xMn_2-xO_y as cathode materials discharge at 4.7 V versus Li⁺/Li potential produced high stability of structures during lithium insertion/extraction. The supplement of Ni amount of x > 0.5 appeared the secondary cubic phase of hexa-nickel Manganese Oxide which assisted the material increase the electrochemical performance. The additional heat treatment at 700 ^oC for 36 hours of two phases LiNi_0.5Mn_1.5O₄ and Ni₆MnO₈ enhances cycle ability of entire materials.