Lithium-rich layered oxide materials are considered as one of the most promising cathodes for high-energy lithium-ion batteries. However, their practical applications are currently restricted by its low initial Coulombic efficiency and poor rate capability and cycling stability. In this study, we report the preparation of Li_1.2Mn_0.54Ni_0.13Co_0.13O₂ nanowires that have porous structures with different contents of spinel phase via a co-precipitation method followed by carefully controlled calcination steps. Structural characterizations verify that the as-prepared nanowires are composed of interconnected nano-sized subunits with porous structures, and spinel phases are embedded inside the layered structure. The electrochemical measurements show that the Li_1.2Mn_0.54Ni_0.13Co_0.13O₂ nanowires bearing moderate content of spinel phase exhibit a high capacity of 291 mAh g⁻¹ at 0.1 C and excellent capacity retention of 91.8% after 200 cycles at 1 C. The results also demonstrate that electrochemical performance of the Li_1.2Mn_0.54Ni_0.13Co_0.13O₂ nanowires is influenced by the content of spinel phase which can be readily tuned by changing the heating rate in the calcination step. The combination of one-dimension porous structures and built-in spinel domains in Li_1.2Mn_0.54Ni_0.13Co_0.13O₂ nanowires improves the electrolyte contact and Li⁺ diffusion, and restrains structural degeneration.

富锂层状氧化物材料被认为是高能锂离子电池最有希望的阴极之一。但是，目前它们的实际应用受到初始库仑效率低，速率能力和循环稳定性差的限制。在这项研究中，我们报告了通过多孔结构制备具有不同尖晶石相含量的Li _1.2 Mn _0.54 Ni _0.13 Co _0.13 O ₂纳米线的方法。共沉淀法，然后仔细控制煅烧步骤。结构表征证明，所制备的纳米线由具有多孔结构的互连纳米尺寸亚单元组成，并且尖晶石相嵌入层状结构内部。电化学测量表明，具有适度尖晶石相含量的Li _1.2 Mn _0.54 Ni _0.13 Co _0.13 O ₂纳米线 在0.1 C时表现出291 mAh g ^-1的高容量，在1 C下200次循环后表现出出色的容量保持率91.8％。结果还表明Li _1.2 Mn _0.54 Ni _0.13 Co的电化学性能_0.13 O ₂纳米线受尖晶石相含量的影响，尖晶石相的含量可以通过改变煅烧步骤中的加热速率来容易地调节。Li _1.2 Mn _0.54 Ni _0.13 Co _0.13 O ₂纳米线中的一维多孔结构和内置尖晶石畴的组合改善了电解质接触和Li ⁺扩散，并抑制了结构退化。