Surface deterioration occurs more easily in nickel-rich cathode materials with the increase of nickel content. To simultaneously prevent deterioration of active cathode materials and improve the electrochemical performance of the nickel-rich cathode material, the surface of nickel-rich LiNi_0.6Co_0.2Mn_0.2O₂ cathode material is decorated with the stable structure and conductive Li₃PO₄ by a facile method. The LiNi_0.6Co_0.2Mn_0.2O₂-1wt%, 2wt%, 3wt%Li₃PO₄ samples deliver a high-capacity retention of more than 85% after 100 cycles at 1 C under a high voltage of 4.5 V. The effect of different coating amounts (0–5wt%) for the LiNi_0.6Co_0.2Mn_0.2O₂ cathode is analyzed in detail. Results show that 2wt% coating of Li₃PO₄ gives better performance compared to other coating concentrations. Detailed analysis of the structure of the samples during the charge-discharge process is performed by in-situ X-ray diffraction. It is indicated that the modification for LiNi_0.6Co_0.2Mn_0.2O₂ cathode could protect the well-layered structure under high voltages. In consequence, the electrochemical performance of modified samples is greatly improved.

随着镍含量的增加，富镍正极材料更容易发生表面劣化。为了同时防止活性阴极材料的劣化，提高了富镍阴极材料的电化学性能，富镍的LiNi的表面_0.6钴_0.2锰_0.2 ø ₂阴极材料装饰的结构稳定，导电性李₃ PO ₄通过一种简便的方法。LiNi _0.6 Co _0.2 Mn _0.2 O ₂ -1wt%, 2wt%, 3wt% Li ₃ PO ₄样品在 4.5 V 高电压下 1 C 下循环 100 次后容量保持率超过 85%。LiNi _0.6 Co _0.2 Mn _0.2 O ₂正极的不同涂层量（0-5wt%）的影响是详细分析。结果表明，与其他涂层浓度相比，2wt% 的 Li ₃ PO ₄涂层具有更好的性能。通过原位X 射线衍射对充放电过程中样品的结构进行详细分析。表明对 LiNi _0.6 Co _0.2 Mn _0.2 O ₂的改性阴极可以在高压下保护良好的层状结构。因此，改性样品的电化学性能大大提高。