Ni‐rich cathode materials have become one of the most promising cathode materials for advanced high‐energy Li‐ion batteries (LIBs) owing to their high specific capacity. However, Ni‐rich cathode materials are sensitive to the trace H₂O and CO₂ in the air, and tend to react with them to generate LiOH and Li₂CO₃ at the particle surface region (named residual lithium compounds, labeled as RLCs). The RLCs will deteriorate the comprehensive performances of Ni‐rich cathode materials and make trouble in the subsequent manufacturing process of electrode, including causing low initial coulombic efficiency and poor storage property, bringing about potential safety hazards, and gelatinizing the electrode slurry. Therefore, it is of considerable significance to remove the RLCs. Researchers have done a lot of work on the corresponding field, such as exploring the formation mechanism and elimination methods. This paper investigates the origin of the surface residual lithium compounds on Ni‐rich cathode materials, analyzes their adverse effects on the performance and the subsequent electrode production process, and summarizes various kinds of feasible methods for removing the RLCs. Finally, we propose a new research direction of eliminating the lithium residuals after comparing and summing up the above. We hope this work can provide a reference for alleviating the adverse effects of residual lithium compounds for Ni‐rich cathode materials’ industrial production.

中文翻译：

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去除富镍阴极材料表面残留锂化合物的策略†

富镍阴极材料因其高比容量而成为高级高能锂离子电池（LIB）最有希望的阴极材料之一。但是，富镍阴极材料对空气中的痕量H ₂ O和CO ₂敏感，并且倾向于与它们反应生成LiOH和Li ₂ CO ₃在颗粒表面区域（称为残留锂化合物，标记为RLC）。RLC会降低富镍正极材料的综合性能，并在随后的电极制造过程中造成麻烦，包括引起初始库仑效率低和储藏性能差，潜在的安全隐患以及使电极浆料糊化。因此，删除RLC具有相当重要的意义。研究人员在相应领域做了很多工作，例如探索形成机理和消除方法。本文研究了富镍正极材料上表面残留锂化合物的来源，分析了其对性能和后续电极生产工艺的不利影响，并总结了删除RLC的各种可行方法。最后，在对上述内容进行比较和总结后，我们提出了消除锂残留物的新研究方向。我们希望这项工作可以为减轻残留锂化合物对富镍正极材料工业生产的不利影响提供参考。