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Single-Crystal Ni-Rich Layered LiNi0.9Mn0.1O2 Enables Superior Performance of Co-Free Cathodes for Lithium-Ion Batteries
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2022-04-01 , DOI: 10.1021/acssuschemeng.1c06704 Pengpeng Dai 1 , Xiangbang Kong 1 , Huiya Yang 1 , Jiyang Li 1 , Jing Zeng 1 , Jinbao Zhao 1
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2022-04-01 , DOI: 10.1021/acssuschemeng.1c06704 Pengpeng Dai 1 , Xiangbang Kong 1 , Huiya Yang 1 , Jiyang Li 1 , Jing Zeng 1 , Jinbao Zhao 1
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Cobalt-free nickel-rich layered oxides are considered as promising next-generation cathode materials for lithium-ion batteries (LIBs) due to their high capacity and controllable costs. However, the inferior cycling stability makes their application questionable. Herein, polycrystalline LiNi0.9Mn0.1O2 (PC-NM91) and single crystal LiNi0.9Mn0.1O2 (SC-NM91) were prepared by mixing the precursor with LiOH·H2O (and Li2SO4·H2O for SC-NM91). SC-NM91 with complete structure, uniform morphology, and good dispersion was successfully synthesized. The initial discharge capacity and Coulombic efficiency of both samples were similar. However, the capacity retention of SC-NM91 was 85.3% after 300 cycles at 1 C, while PC-NM91 showed only 65.8% under the same conditions. The proposed SC-NM91 cathode has better cycle stability than PC-NM91, especially under severe cycle conditions (4.5 V, 2 C, and 60 °C). The enhanced performance of SC-NM91 can be ascribed to the stronger structure, which prevents intergranular cracks, surface pulverization, disordered phase transition, and interface side reactions. In addition, it has a lower degree of Li+/Ni2+ mixing and fast Li+ diffusivity. This study provides insight into the role of single crystal structure in mitigating the performance degradation of Co-free Ni-rich cathodes and reveals that SC-NM91 can be a commercially available cathode material for high-energy LIBs.
中文翻译：
单晶富镍层状 LiNi0.9Mn0.1O2 使锂离子电池的无钴阴极具有卓越的性能
无钴富镍层状氧化物因其高容量和可控成本被认为是有前途的下一代锂离子电池（LIB）正极材料。然而，较差的循环稳定性使得它们的应用受到质疑。在此，通过将前驱体与LiOH · H 2 O （和Li 2 SO 4 · H 2O 代表 SC-NM91）。成功合成了结构完整、形貌均匀、分散性好的SC-NM91。两个样品的初始放电容量和库仑效率相似。然而，SC-NM91 在 1 C 循环 300 次后容量保持率为 85.3%，而 PC-NM91 在相同条件下仅显示 65.8%。所提出的 SC-NM91 正极比 PC-NM91 具有更好的循环稳定性，尤其是在严苛的循环条件下（4.5 V、2 C 和 60 °C）。SC-NM91 的增强性能可归因于更强的结构，可防止晶间裂纹、表面粉碎、无序相变和界面副反应。此外，它具有较低的Li + /Ni 2+混合度和快速的Li +扩散性。这项研究深入了解了单晶结构在减轻无钴富镍正极性能退化中的作用，并揭示了 SC-NM91 可以成为高能锂离子电池的商用正极材料。
更新日期：2022-04-01
中文翻译：
单晶富镍层状 LiNi0.9Mn0.1O2 使锂离子电池的无钴阴极具有卓越的性能
无钴富镍层状氧化物因其高容量和可控成本被认为是有前途的下一代锂离子电池（LIB）正极材料。然而，较差的循环稳定性使得它们的应用受到质疑。在此，通过将前驱体与LiOH · H 2 O （和Li 2 SO 4 · H 2O 代表 SC-NM91）。成功合成了结构完整、形貌均匀、分散性好的SC-NM91。两个样品的初始放电容量和库仑效率相似。然而，SC-NM91 在 1 C 循环 300 次后容量保持率为 85.3%，而 PC-NM91 在相同条件下仅显示 65.8%。所提出的 SC-NM91 正极比 PC-NM91 具有更好的循环稳定性，尤其是在严苛的循环条件下（4.5 V、2 C 和 60 °C）。SC-NM91 的增强性能可归因于更强的结构，可防止晶间裂纹、表面粉碎、无序相变和界面副反应。此外，它具有较低的Li + /Ni 2+混合度和快速的Li +扩散性。这项研究深入了解了单晶结构在减轻无钴富镍正极性能退化中的作用，并揭示了 SC-NM91 可以成为高能锂离子电池的商用正极材料。
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