The nickel‐rich LiNi_0.91Co_0.06Al_0.03O₂ cathode material has attracted wide attention due to its high energy density and appropriate thermal stability; however, its practical application has been greatly restricted by exorbitant residual LiOH/Li₂CO₃ and poor cycling performance. In this work, we have reduced the residual LiOH/Li₂CO₃ by washing the LiNi_0.91Co_0.06Al_0.03O₂ fabricated through a high‐temperature solid‐state method and improved the cycling performance with a composite coating process. The results show that the amount of residual LiOH/Li₂CO₃ in the washed materials is significantly decreased, which is very favorable for the processability of materials. LiNi_0.91Co_0.06Al_0.03O₂ with 0.1 wt% composite coating exhibits optimum properties: the discharge capacity reaches 217.4 mAh/g at 0.1 C, the cycling retention still remains at 93.7 % after 100 cycles at 1 C, and the cycling retention of the soft‐packing battery remains as high as 81.7 % after 800 cycles at 1 C. The excellent electrochemical performances are attributed to the synergistic effect of excellent fluidity of H₃BO₃ and outstanding stability of Y₂O₃, mitigating the interface reaction between electrolyte and cathode material.

中文翻译：

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通过H3BO3和Y2O3复合涂层提高富镍LiNi0.91Co0.06Al0.03O2正极材料的电化学循环稳定性

富镍的LiNi _0.91 Co _0.06 Al _0.03 O ₂正极材料因其高能量密度和适当的热稳定性而备受关注。然而，其实际应用受到过高的残留LiOH / Li ₂ CO ₃残留和不良循环性能的限制。在这项工作中，我们通过洗涤LiNi _0.91 Co _0.06 Al _0.03 O ₂减少了残留的LiOH / Li ₂ CO ₃。通过高温固态方法制造，并通过复合涂层工艺改善了循环性能。结果表明，洗涤后的材料中残留的LiOH / Li ₂ CO ₃的量显着减少，这对材料的可加工性非常有利。LiNi _0.91 Co _0.06 Al _0.03 O ₂具有0.1 wt％的复合涂层具有最佳性能：在0.1 C下放电容量达到217.4 mAh / g，在1 C下进行100次循环后，循环保持率仍保持在93.7％，软包装电池的循环保持率保持在较高水平在1 C下进行800次循环后，其电导率为81.7％。优异的电化学性能归因于H ₃ BO ₃的出色流动性和Y ₂ O _3的出色稳定性的协同效应，从而减轻了电解质与正极材料之间的界面反应。