Abstract
Our recent work, published in Nature (610, 67–73, 2022) and Nature Energy (695–702, 2023), demonstrates the effectiveness of high-entropy doping (HE) in tackling the stability-capacity challenge of zero-cobalt layered cathode active materials (CAMs). While the HE Ni-80% (HE-N80) CAM exhibits competitive discharge capacity, it slightly lags behind NMC-811. This presentation delves into the broader applicability of the HE strategy and highlights the crucial role of pre-CAM microstructure optimization.Through pre-CAM microstructure optimization, we significantly reduce layered CAMs' anti-site defects, leading to a notable enhancement in discharge capacity. This optimization strategy increases the discharge capacity of the HE-N80 cathode from 210 mAh/g to 220 mAh/g under 0.1C charging and 2.5-4.4V voltage window. Moreover, cycling stability sees a substantial improvement, with a 99.5% capacity retention at 0.5C after 100 cycles. The effectiveness of this methodology extends to CAMs with higher nickel content, as demonstrated by discharge capacities of 225 mAh/g for zero-cobalt HE-N85 and 235 mAh/g for zero-cobalt HE-N90 under the same conditions.
Published Version
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