Electrochemical Performance of Li- and Mn-Rich Cathodes in Full Cells with Prelithiated Graphite Negative Electrodes

Li- and Mn-rich layered oxide cathodes are known to suffer from capacity fading and average discharge voltage decay upon cycling. In the present study, the improved cycling stability of a Li and Mn-rich cathode Li1.2Ni0.27Mn0.40Co0.13O2 in full cells is reported. The electrochemical performance of the Li- and Mn-rich cathodes comprising Li1.2Ni0.13Mn0.54Co0.13O2 and Li1.2Ni0.27Mn0.40Co0.13O2 was tested in Li-ion full cells with graphite as anode material at 30 C-circle. The full cells with Li1.2Ni0.13Mn0.54Co0.13O2 cathodes exhibited initially high capacities of about 250 mAh g(1), which fades rapidly to 130 mAh g(-1) after 120 cycles at C/5 rate. However, full cells comprising Li1.2Ni0.27Mn0.40Co0.13O2 cathodes exhibited an initial capacity of about 190 mAh g(-1) with very stable cycle-life, i.e., about 185 mAh g(-1) after 150 cycles at C/5 rate. Also, these cathodes possess higher rate capability as compared to full cells comprising Li1.2Ni0.13Mn0.54Co0.13O2 cathodes. Thus, the electrochemical performance of Li1.2Ni0.27Mn0.40Co0.13O2 cathodes in full cells with prelithiated graphite anodes is promising for practical high energy density Li-ion batteries. These results indicate the positive influence of higher Ni content in Li-and Mn-rich cathodes for better electrochemical performance in practical Li-ion batteries.