Ni‐rich cathode is considered a promising cathode for its high specific capacity. However, a sharp capacity attenuation induced by interface problems limits the application of the cathode material. Herein, we propose a practical surface modification strategy by introducing diboron trioxide (B 2 O 3 ) to the surface of LiNi 0.83 Co 0.12 Mn 0.05 O 2 (NCM) cathode materials. B 2 O 3 ‐modified NCM shows superior cyclic stability with a capacity retention of 87.7% at 1 C after 200 cycles in comparison to 69.4% for a bare NCM. On the basis of material and electrochemical characterizations, we conclude that the superior cycle stability of B 2 O 3 ‐modified NCM material benefits from the formation of B 2 O 3 coating and B 3+ doping on the surface. The B 2 O 3 coating layer that is confirmed by scanning and transmission electron microscopy can suppress surface side reactions and reduce the content of Li 2 CO 3 on the surface. The B 3+ ‐doping surface is verified by X‐ray diffraction and X‐ray photoelectron spectroscopy and triggers a reduction of a small amount of Ni 3+ to Ni 2+ . Furthermore, the combination of surface B 2 O 3 coating and B 3+ doping inhibits the irreversible phase transitions and extension of microcracks in the NCM material. The above surface modification strategy provides a direction for the acquisition of long‐life cathode materials.

中文翻译：

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通过B2O3表面改性实现富镍层状LiNi0.83Co0.12Mn0.05O2阴极的优异循环稳定性

富镍阴极因其高比容量而被认为是很有前途的阴极。然而，由界面问题引起的急剧的容量衰减限制了阴极材料的应用。在此，我们提出了一种实用的表面改性策略，即将三氧化二硼（B 2 O 3）引入到LiNi 0.83 Co 0.12 Mn 0.05 O 2（NCM）正极材料的表面。B 2 O 3改性的NCM表现出优异的循环稳定性，在200个循环后，在1 C下的容量保持率为87.7％，而裸露的NCM为69.4％。根据材料和电化学特性，我们得出结论，B 2 O 3改性的NCM材料具有优异的循环稳定性，这得益于表面上形成B 2 O 3涂层和B 3+掺杂。通过扫描和透射电子显微镜确认的B 2 O 3涂层可以抑制表面副反应并降低表面上Li 2 CO 3的含量。B 3+掺杂表面已通过X射线衍射和X射线光电子能谱验证，并引发了少量的Ni 3+还原为Ni 2+。此外，表面B 2 O 3涂层和B 3+掺杂的组合抑制了NCM材料中不可逆的相变和微裂纹的扩展。上述表面改性策略为获得长寿命阴极材料提供了方向。表面B 2 O 3涂层和B 3+掺杂的结合抑制了NCM材料中不可逆的相变和微裂纹的扩展。上述表面改性策略为获得长寿命阴极材料提供了方向。表面B 2 O 3涂层和B 3+掺杂的结合抑制了NCM材料中不可逆的相变和微裂纹的扩展。上述表面改性策略为获得长寿命阴极材料提供了方向。