Lithium‐rich layered oxides have attracted much attention for the high energy density, but they still suffer from cycling degradation and sluggish kinetic capability. In the present study, a novel modification of Li_1.143Mn_0.544Ni_0.136Co_0.136O₂ sphere cathode materials by a hierarchical surface configuration is proposed, which integrates advantages of dual oxide layers of both amorphous and nanocrystalline Al₂O_3, as well as an inner spinel membrane. Mainly promoted by an ultrafast heterogeneous nucleation of Al(NO)₃ nanoseeds caused by huge solubility differences, it only takes several minutes for pretreatment. After common annealing at low temperature, the obtained material is capable to deliver a high discharge capacity of 296.3 mAh g⁻¹ with initial Coulombic efficiency of 92.9% at 0.1 C rate, and maintain stable cycling at both 0.2 and 0.5 C rates. Besides, rate performances are also enhanced as a result of the superior interface gained after surface modification, which produces reduced polarization during cycling. Through comprehensive analyses, improved surface property and stability are confirmed as the key to these enhancements. This strategy is anticipated to inspire new modification designs in future high energy density cathode materials.

中文翻译：

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超快异相成核可实现富锂分层氧化物阴极材料的分层表面构型，从而增强电化学性能

富含锂的层状氧化物因其高能量密度而备受关注，但它们仍遭受循环降解和动力学能力低下的困扰。在本研究中，提出了一种通过分级表面构型对Li _1.143 Mn _0.544 Ni _0.136 Co _0.136 O ₂球形阴极材料进行的新型改性，它兼顾了非晶态和纳米晶态的Al ₂ O ₃的双重氧化物层的优点_，以及尖晶石内膜。主要由Al（NO）₃的超快异质成核促进由于巨大的溶解度差异造成的纳米种子，仅需几分钟即可进行预处理。在低温下进行普通退火之后，所获得的材料能够以0.1 C的速率提供296.3 mAh g ^-1的高放电容量和92.9％的初始库仑效率，并在0.2和0.5 C的速率下均保持稳定的循环。此外，由于表面改性后获得了优异的界面，从而提高了速率性能，从而降低了循环过程中的极化。通过综合分析，确定改善的表面性能和稳定性是这些增强的关键。该策略有望在未来的高能量密度阴极材料中激发新的修改设计。