This study investigates the use of lanthanide elements to modify a layered oxide cathode through solid-state calcination. Based on the findings, the modified cathodes demonstrated enhanced electrochemical performance, as lanthanide modification played dual roles in doping and coating. Some lanthanide ions entered the cathode lattice, expanding Li⁺ diffusion channels and stabilizing the crystal structure, while others formed a coating layer to prevent direct contact with the electrolyte and suppress undesirable side reactions. The Eu-modified cathode showed superior initial Coulombic efficiency, capacity retention, and rate ability, which can be attributed to the low dissociation energy that accelerated Eu ion entry into the cathode lattice, improving its structural stability. The Eu-modified LNCM increased Coulombic efficiency from 81.9 to 88.9%. More importantly, the data show that the modified electrode has better magnification performance and it is more stable after several cycles. This research provides new insights into the use of lanthanide modification to improve the performance of oxide cathodes, which could potentially be applied to other battery systems.

本研究研究了使用镧系元素通过固态煅烧来改性层状氧化物阴极。根据这些发现，改性阴极表现出增强的电化学性能，因为镧系元素改性在掺杂和涂层中发挥双重作用。一些镧系元素离子进入阴极晶格，使Li ^+膨胀扩散通道并稳定晶体结构，而另一些则形成涂层以防止与电解质直接接触并抑制不良副反应。Eu修饰的正极表现出优异的初始库仑效率、容量保持率和倍率能力，这可归因于低解离能加速了Eu离子进入正极晶格，提高了其结构稳定性。经过 Eu 修饰的 LNCM 将库仑效率从 81.9% 提高到 88.9%。更重要的是，数据表明修饰电极具有更好的放大性能，并且在多次循环后更加稳定。这项研究为使用镧系元素改性来提高氧化物阴极的性能提供了新的见解，这有可能应用于其他电池系统。