Despite the commercialization and tremendous attention of the Ni-rich LiNiCoMnO₂ cathode due to high energy and working voltage, there are still hurdles to be improved. The conventional polycrystalline Ni-rich LiNiCoMnO₂ suffers from decays of specific capacity and energy during long-term cycling. It originates from more deficiency of oxygen and microcracking, resulting in severe phase transition toward disordered rock salt phase. Herein, single-crystalline Ni-rich LiNi_0.91Co_0.06Mn_0.03O₂ is successfully prepared to overcome these inherent drawbacks of polycrystalline. Benefiting from reduced specific surface area and grain boundaries, single-crystalline Ni-rich LiNi_0.91Co_0.06Mn_0.03O₂ outperforms polycrystalline in all electrochemical performances. The single-crystalline LiNi_0.91Co_0.06Mn_0.03O₂ exhibits not only superior cycle stability of 84.7% at 40°C after 100 cycles but also high-capacity retention of 76.2% under 2 C via improving structural integrity. Therefore, this work reveals that single crystalline can be a breakthrough for stable and high electrochemical performances.

中文翻译：

---

单晶富镍 LiNi0.91Co0.06Mn0.03O2 正极可实现持久的界面稳定性，从而实现高电化学性能

尽管富镍LiNiCoMnO ₂正极由于高能量和高工作电压而获得商业化和极大关注，但仍有许多障碍需要改进。传统的富Ni多晶LiNiCoMnO ₂在长期循环过程中会出现比容量和能量的衰减。它源于更多的缺氧和微裂纹，导致向无序岩盐相的严重相变。在此，成功地制备了单晶富Ni LiNi _0.91 Co _0.06 Mn _0.03 O ₂以克服多晶的这些固有缺陷。受益于减少的比表面积和晶界，单晶富镍 LiNi _0.91Co _0.06 Mn _0.03 O ₂在所有电化学性能上都优于多晶。单晶 LiNi _0.91 Co _0.06 Mn _0.03 O ₂不仅在 40°C 循环 100 次后具有 84.7% 的优异循环稳定性，而且通过改善结构完整性在 2 C 下具有 76.2% 的高容量保持率。因此，这项工作表明单晶可以成为稳定和高电化学性能的突破。