Abstract
The wide application of Manganese-rich cathode materials have been severely restricted by the large initial irreversible capacity loss, poor cycling stability and low discharge capability at high rate. To ameliorate these severe challenges, the Li2ZrO3 and PEDOT materials were adopted to synthesize the Li2ZrO3 and PEDOT co-coated cathode by the sol-gel method with a calcination process. The SEM and TEM images revealed the Li2ZrO3 and PEDOT were uniformly covered on the surface of Li[Li0.2Mn0.54Ni0.13Co0.13]O2. The electrochemical properties of cathode were obviously enhanced by the Li2ZrO3 coating and PEDOT coating. The Li2ZrO3 coated cathode, PEDOT coated cathode and Li2ZrO3/PEDOT coated cathode respectively delivered the discharge capacities of 120.5, 113.5 and 128.6 mAhg−1, much higher than that (82.3 mAhg−1) of Li[Li0.2Mn0.54Ni0.13Co0.13]O2. Besides, the pristine cathode merely retained a capacity of 156.7 mAhg−1 after 300 cycles at 45 °C. While a large discharge capacity of 201.4 mAh g−1 and a supernal capacity retention of 90.8% were acquired for Li2ZrO3/PEDOT coated cathode after 300 cycles. The electrochemical impedance spectroscopy (EIS) measurement implied the Li2ZrO3 coating and PEDOT coating layer could repress the growth of the charge transfer resistance and accelerate the Li+ diffusion during cycling.
Published Version
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