Although layered Li[Ni_0.5Co_0.2Mn_0.3]O₂ (LNCM 523) is one of the most promising cathode materials for lithium-ion batteries, large capacity losses during charging and discharging, due to poor surface stability, have limited its application. Surface modifications can be effective at improving the electrochemical performance of cathode materials. In this study, an oligomer polymer, named LIVING, was synthesized from bisphenol A diglycidyl ether diacrylate and barbituric acid and then used it as a coating material for LNCM 523 particles. Fourier transform infrared spectroscopy, X-ray diffraction, X-ray photoelectron spectroscopy, transmission electron microscopy, scanning electron microscopy, thermogravimetric analysis, and electrochemical methods were employed to investigate the structure, surface properties, thermal stabilities, and electrochemical properties of the electrodes. Both coated (LIVING@LNCM 523) and uncoated (LNCM 523) electrodes were tested for their battery performance. A cathode material coated with 0.5 wt.% of LIVING (0.5% LIVING@LNCM 523) at a layer thickness of approximately 10 nm showed enhanced cycle stability, with over 80.7% of the capacity retained after 100 cycles at a rate of 0.2C; in comparison, the LNCM 523 electrode retained no more than 66.2% of its capacity under the same conditions. The coated electrode (0.5% LIVING@LNCM 523) also exhibited a better rate capability, retaining about 91% of its initial capacity after applying various current loads, whereas LNCM 523 retained only 79% after applying the same current loads under the same conditions. The improved electrochemical performance of the modified electrode is attributed to the chemical interactions between LNCM 523 and LIVING providing a uniform and stable oligomer layer on the LNCM 523 surface, thereby preventing the LNCM 523 surface from deeper electrolyte ion intercalation and suppressing the growth of interfacial resistance. The coating material (LIVING) appears to have great potential for improving the electrochemical performance of layered structure cathode materials, with promising applications in highly energy demanding lithium-ion batteries.

尽管是层状的Li [Ni _0.5 Co _0.2 Mn _0.3 ] O ₂（LNCM 523）是锂离子电池最有希望的正极材料之一，由于表面稳定性差，因此在充电和放电过程中的大容量损耗限制了其应用。表面改性可以有效地改善阴极材料的电化学性能。在这项研究中，由双酚A二缩水甘油醚二丙烯酸酯和巴比妥酸合成了一种名为LIVING的低聚物聚合物，然后将其用作LNCM 523颗粒的涂料。傅里叶变换红外光谱，X射线衍射，X射线光电子能谱，透射电子显微镜，扫描电子显微镜，热重分析和电化学方法被用来研究电极的结构，表面性质，热稳定性和电化学性质。测试了带涂层（LIVING @ LNCM 523）和未涂层（LNCM 523）电极的电池性能。以约10nm的层厚度涂覆0.5wt。％的LIVING（0.5％LIVING@LNCM 523）的阴极材料显示出增强的循环稳定性，在0.2C的速率下100次循环后保留超过80.7％的容量。相比之下，在相同条件下，LNCM 523电极保留的容量不超过其容量的66.2％。涂覆的电极（0.5％LIVING @ LNCM 523）也显示出更好的倍率能力，在施加各种电流负载后保留其初始容量的约91％，而LNCM 523在相同条件下施加相同电流负载后仅保留79％。修饰电极的电化学性能提高归因于LNCM 523与LIVING之间的化学相互作用，从而在LNCM 523表面上提供了均匀稳定的低聚物层，从而防止了LNCM 523表面更深的电解质离子嵌入并抑制了界面电阻的增长。涂层材料（LIVING）似乎具有改善层状结构阴极材料的电化学性能的巨大潜力，并在对能量要求很高的锂离子电池中具有广阔的应用前景。