Voltage fade significantly hinders the practical use of Li-rich Mn-based layered oxides (LLOs) as cathode materials for next-generation high-energy-density Li-ion batteries. Therefore, an in-depth understanding of the factors influencing the LLO voltage fade during cycling is fundamentally important for tailoring the structure and thus improving the electrochemical performance of the corresponding electrodes. Herein, we compare the electrochemical performances of LLOs with different particle size and conduct in situ high-pressure response measurements to determine the effects of particle size on voltage fade, demonstrating that small particles can undergo a reversible layer-to-spinel phase transition that results in improved voltage stability during cycling. The above finding provides a novel paradigm for the development of high-capacity LLO electrodes and thus contributes to the establishment of a more energy-efficient and green society.

中文翻译：

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富锂锰基层状氧化物的粒径对电压衰减的影响。

电压衰减严重阻碍了富锂锰基层状氧化物（LLO）作为下一代高能密度锂离子电池正极材料的实际使用。因此，深入了解影响循环过程中LLO电压衰减的因素对于调整结构并因此改善相应电极的电化学性能至关重要。本文中，我们比较了具有不同粒径的LLO的电化学性能，并进行了原位高压响应测量，以确定粒径对电压衰减的影响，表明小颗粒可以经历可逆的层到尖晶石相变。在循环期间改善了电压稳定性。