LaNiO₃ thin film coated Li-rich cathode Li_1.2Mn_0.54Ni_0.13Co_0.13O₂ material is fabricated for the first time using the facile sol-gel process. Morphology, structure and battery cycle performance of the LaNiO₃-coated Li_1.2Mn_0.54Ni_0.13Co_0.13O₂ is characterized by a series of tests. LaNiO₃ coating was synthesized by the sol-gel process and uniformly covered powder surface. By coating proper amount of LaNiO₃, the initial Coulombic efficiency, discharge capacity, rate capability and cycle performance are significantly improved, while the charge transfer resistance reduces. The initial Coulombic efficiency of 3 wt% LaNiO₃-coating samples reaches the maximum of 70% and 65% at 0.1 C and 1 C rates, respectively. The 3 wt% LaNiO₃-coating electrode has the highest initial charge/discharge capacity of 405.4/285.1 mAh g⁻¹ at 0.1 C rate (1 C = 250 mA g⁻¹), while 5 wt% LaNiO₃-coating delivers the maximum value of 264.1/165.1 mAh g⁻¹ at 1 C. The cycling performance profiles demonstrate that at 1 C rate, the 3 wt% LaNiO₃-coated electrode exhibits higher discharge specific capacity of 207.6 mAh g⁻¹ and cyclic stability of 190.3 mAh g⁻¹ 92% capacity retention after 50 cycles compared with pristine and other content LaNiO₃. The film resistance and charge transfer resistance both decrease after coating with LaNiO₃. LaNiO₃ is an efficient modifier to enhance electrochemical performance of Li-rich cathode materials.

首次采用简便的溶胶-凝胶法制备了LaNiO ₃薄膜包覆的富锂阴极Li _1.2 Mn _0.54 Ni _0.13 Co _0.13 O ₂材料。通过一系列测试表征了LaNiO ₃包覆的Li _1.2 Mn _0.54 Ni _0.13 Co _0.13 O _2的形貌，结构和电池循环性能。通过溶胶-凝胶法合成了LaNiO ₃涂层，并均匀地覆盖了粉末表面。通过涂覆适量的LaNiO ₃，初始库仑效率，放电容量，倍率能力和循环性能得到显着提高，而电荷转移阻力降低。3 wt％LaNiO ₃涂层样品的初始库仑效率在0.1 C和1 C速率下分别达到70％和65％的最大值。3 wt％的LaNiO ₃涂层电极在0.1 C速率（1 C = 250 mA g ^-1）下具有405.4 / 285.1 mAh g ^-1的最高初始充电/放电容量，而5 wt％的LaNiO ₃涂层可提供最大的初始充电/放电容量。1 C时的最大值为264.1 / 165.1 mAh g ^-1。循环性能曲线表明，在1 C速率下，3 wt％LaNiO ₃与原始和其他含量的LaNiO ₃相比，涂覆有碳氢化合物的电极在20次循环后表现出更高的放电比容量（207.6 mAh g ^-1）和循环稳定性（190.3 mAh g ^-1） 92％的容量保持率，经过50次循环。LaNiO ₃包覆后，薄膜电阻和电荷转移电阻均降低。LaNiO ₃是增强富锂阴极材料电化学性能的有效改性剂。