High capacity lithium-rich layered oxide Li_1.2Ni_0.13Co_0.13Mn_0.54O₂ cathode material is considered as a most promising cathode material for lithium ion batteries. However, its application is greatly limited due to the characteristics of low initial coulombic efficiency and poor low-temperature performance. In this study, AlF₃-coated Li_1.2Ni_0.13Co_0.13Mn_0.54O₂ has been prepared via a facile wet chemical process. It is found that a dense AlF₃ layer with a nanoscale thickness is covered on the surface of Li_1.2Ni_0.13Co_0.13Mn_0.54O₂ particles, building a rapid lithium transport bridge for adjacent active materials and reducing side reaction between the electrolyte and active material. Compared to the pristine Li_1.2Ni_0.13Co_0.13Mn_0.54O₂, 2% AlF₃-coated sample exhibits higher discharge capacity and initial coulombic efficiency (86.7%). Meanwhile, 2% AlF₃-coated sample displays obviously superior rate capability at 0 °C and higher capacity retention at −10 and −20 °C. The improvement of low-temperature performance can reasonably be attributed to the formation of the spinel structure and the LiAlO₂ on the surface of the active materials, which can improve the electronic conductivity and lithium ion conductivity of the cathode material, respectively.

高容量的富锂层状氧化物Li _1.2 Ni _0.13 Co _0.13 Mn _0.54 O ₂正极材料被认为是锂离子电池最有希望的正极材料。然而，由于初始库仑效率低和低温性能差的特性，其应用受到很大限制。在这项研究中，通过简便的湿法化学方法制备了AlF ₃涂层的Li _1.2 Ni _0.13 Co _0.13 Mn _0.54 O ₂。发现在Li _1.2的表面上覆盖了具有纳米级厚度的致密AlF ₃层。Ni _0.13 Co _0.13 Mn _0.54 O ₂颗粒，可为相邻的活性材料建立快速的锂传输桥，并减少电解质和活性材料之间的副反应。与原始的Li _1.2 Ni _0.13 Co _0.13 Mn _0.54 O _2相比，涂有2％AlF ₃的样品表现出更高的放电容量和初始库伦效率（86.7％）。同时，2％AlF ₃涂覆的样品在0°C时显示出明显优越的速率能力，在-10和-20°C下具有更高的容量保持率。低温性能的改善可以合理地归因于在活性材料表面上形成尖晶石结构和LiAlO ₂，这可以分别改善正极材料的电子电导率和锂离子电导率。