With the skyrocketing market demands for energy storage, lithium ions batteries (LIB) with higher energy density are urgently needed. Cathodes play a critical role in determining the energy density of LIB, and the most popular one is Ni‐rich cathode due to its high capacity. However, due to the fast structural degradation, Ni‐rich cathode materials should be further modified to achieve higher stability. Herein, we introduce bismuth ions in LiNi0.83Co0.11Mn0.06O2 cathodes by adding Bi2O3 during sintering to optimize the specific capacity and cycle stability. By adding 0.1% mol Bi, the Li+ diffusion and structural stability are effectively optimized, leading to improved electrochemical performances. The modified sample delivers much higher specific capacity (222.9 mAhg‐1, 0.05C) than unmodified sample (204 mAhg‐1, 0.05C). Meanwhile, the specific capacity of optimized sample after 100 cycles at 0.33C is 27.75 mAhg‐1 higher than that of unmodified sample. Therefore, this work demonstrates that Bi doping can be regarded as a possible solution to optimizing the electrochemical performance of Ni‐rich cathodes.

中文翻译：

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了解 Bi2O3 改性对富镍阴极性能的影响

随着储能市场需求的猛增，迫切需要更高能量密度的锂离子电池（LIB）。正极在决定锂离子电池的能量密度方面起着至关重要的作用，其中最受欢迎的一种是富镍正极，因为它具有高容量。然而，由于结构降解速度快，富镍正极材料需要进一步改性以实现更高的稳定性。在此，我们通过在烧结过程中添加 Bi2O3 在 LiNi0.83Co0.11Mn0.06O2 正极中引入铋离子，以优化比容量和循环稳定性。通过添加0.1% mol Bi，有效优化了Li+扩散和结构稳定性，从而提高了电化学性能。修饰后的样品比未修饰的样品（204 mAhg-1，0.05C）具有更高的比容量（222.9 mAhg-1，0.05C）。同时，优化后的样品在0.33C下循环100次后的比容量比未修改的样品高27.75 mAhg-1。因此，这项工作表明Bi掺杂可以被视为优化富镍正极电化学性能的可能解决方案。