Effect of Ni2+ Content on Lithium/Nickel Disorder for Ni-Rich Cathode Materials

Li excess LiNi0.8Co0.1Mn0.1O2 was produced by sintering the Ni0.8Co0.1Mn0.1(OH)2 precursor with different amounts of a lithium source. X-ray photoelectron spectroscopy confirmed that a greater excess of Li+ leads to an increase in the number of Ni2+ ions. Interestingly, the level of Li+/Ni2+ disordering decreases with an increase in Ni2+ content determined by the I003/I104 ratio in the X-ray diffraction patterns. The electrochemical measurement shows that the cycling stability and rate capability improve with an increase in Ni2+ content. After cycling, electrochemical impedance spectroscopy shows decreased charge transfer resistance, and the XRD patterns exhibit an increased I003/I104 ratio with an increase in Ni2+ content, reflecting the decrease in the level of Li+/Ni2+ disorder during cycling.