Nickel-rich layered LiNi_0.8Co_0.1Mn_0.1O₂ is a promising cathode material due to its high specific capacity. However, commercial application of this material is impeded by its rapid capacity degradation associated with structural instability. In this work, 0.5–2 mol% Nb⁵⁺ doped LiNi_0.8Co_0.1Mn_0.1O₂ cathode material is prepared by heat treatment of a mixture of stoichiometric amounts of nano-sized Nb₂O₅ powders, co-precipitated Ni_xMn_1-x(OH)₂ precursors, and LiOH·H₂O. The results show that Nb⁵⁺ doping significantly improves the cycling properties of LiNi_0.8Co_0.1Mn_0.1O₂ cathode material and that the optimal Nb⁵⁺ content in the structure is 1 mol%. Under a voltage range of 2.75–4.3 V, 1 mol% Nb⁵⁺ doped LiNi_0.8Co_0.1Mn_0.1O₂ cathode material shows an initial discharge capacity of 180.2 mAh/g at 0.1C, with a capacity retention of 96.9% for subsequent 300 cycles at 1C at room temperature. In contrast, bare LiNi_0.8Co_0.1Mn_0.1O₂ shows a capacity retention of only ~79.8% under the same conditions, with an initial specific discharge capacity of 184.9 mAh/g. The improvement in cycling performance is attributed to stabilization of the layered structure by Nb⁵⁺, mitigated migration of Ni²⁺ to the Li layer, improved lithium diffusion kinetics and reduced lattice expansion/shrinkage during cycling. Stabilization of the layered structure by Nb⁵⁺ doping is further reflected by the observation of fewer cracks in cathode electrodes after prolonged cycling.

富镍层状LiNi _0.8 Co _0.1 Mn _0.1 O ₂由于其高比容量而成为一种很有前途的阴极材料。然而，这种材料的商业应用由于其与结构不稳定性相关的快速容量降低而受到阻碍。在这项工作中，通过热处理化学计量的纳米级Nb ₂ O ₅粉末，共沉淀的Ni _x Mn的混合物，制备了0.5-2 mol％的Nb ⁵⁺掺杂的LiNi _0.8 Co _0.1 Mn _0.1 O ₂阴极材料。_1-x（OH）₂前体和LiOH·H ₂O.结果表明，Nb ⁵⁺掺杂显着改善了LiNi _0.8 Co _0.1 Mn _0.1 O ₂正极材料的循环性能，并且结构中的最佳Nb ⁵⁺含量为1 mol％。在2.75–4.3 V的电压范围内，掺杂1 mol％Nb ^5+的LiNi _0.8 Co _0.1 Mn _0.1 O ₂正极材料在0.1C时的初始放电容量为180.2 mAh / g，随后的容量保持率为96.9％在室温下于1C进行300次循环。相反，裸露的LiNi _0.8 Co _0.1 Mn _0.1 O ₂在相同条件下显示的容量保持率仅为〜79.8％，初始比放电容量为184.9 mAh / g。循环性能的改善归因于Nb ⁵⁺稳定层状结构，减轻了Ni ²⁺向Li层的迁移，改善了锂的扩散动力学并减少了循环过程中的晶格膨胀/收缩。通过观察Nb ⁵⁺掺杂对层状结构的稳定作用，还可以通过长时间循环后观察到阴极电极中较少的裂纹来体现。