The application of Li‐rich and Mn‐based layered cathode materials is impeded by the discharge voltage decay and capacity fading upon cycling, despite their high specific capacity. Here, we combine pre‐activation and nanoscale defects modification of lithium rich and manganese based layered materials to mitigate the above two serious problems through improved anionic redox activity and Li⁺ conductivity. The optimum constructed nanoscale defects rich cathode material delivers a reduced voltage fading rate of 1.27 mV per cycle compared to 3.7 mV per cycle for the pristine material after 200 cycles at 1 C rate. Moreover, the nanoscale defects rich material delivers a high specific discharge capacity of 173.1 mAh·g^–1 with a high capacity retention of 99.5 % after 200 cycles at 1 C rate superior than the pristine material (89.3 mAh·g^–1 and 53.4 %, respectively). This study highlights the reversibility of oxygen redox in electrochemical stability and effectiveness of nanoscale defects in stabilize voltage.

中文翻译：

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通过柠檬酸进行预活化和引入缺陷以减轻富锂阴极的容量和电压衰减

富锂和锰基层状阴极材料的应用受到放电电压衰减和循环时容量衰减的阻碍，尽管它们的比容量很高。在这里，我们结合了富锂和锰基层状材料的预活化和纳米级缺陷改性，以通过改善阴离子氧化还原活性和Li ⁺电导率来缓解上述两个严重问题。最佳构造的富含纳米级缺陷的阴极材料可提供每周期1.27 mV的降低的电压衰落速率，而在1 C速率下经过200次循环后，原始材料的每周期可降低3.7 mV。此外，富含纳米级缺陷的材料可提供173.1 mAh · g ^–1的高比放电容量在200 C循环后以1 C的速率具有99.5％的高容量保持率，优于原始材料（分别为89.3 mAh · g ^–1和53.4％）。这项研究强调了氧氧化还原在电化学稳定性和稳定电压中纳米级缺陷有效性方面的可逆性。