Nick-rich lithium metal oxides with the virtues of high capacity and relative low-cost are considered as the promising cathode materials for high energy lithium ion batteries (LIBs). Herein, the P and F ions are introduced to co-dope into the crystal structure of commercial LiNi_0.6Co_0.2Mn_0.2O₂ (NCM622) at transition-metal layers and oxygen sites, respectively. Thus, the lattice parameters of NCM622 are enlarged, and its surface structure is stabilized as well, leading to enhanced cycling performance and rate capability. The co-doped samples using 3% and 6% LiPF₆ solution have a capacity retention of 143.1 mAh g⁻¹ and 143 mAh g⁻¹ (88.5% and 88.3% of the initial capacities) at 56 mA g⁻¹ in 100 cycles, which are of 7.3% higher than that of undoped NCM622 (133.3 mAh g⁻¹, 81.3%). Further increasing the current density to 280 mA g⁻¹, the capacity retention ratio as high as 93.8% (134.5 mAh g⁻¹) are achieved in 100 cycles for the 6% sample, corresponding to 17.4% of capacity enhancement as compared with that of undoped one. Moreover, we discovered that P and F codoping can also largely improve the cycle stability of the LiNi_1/3Co_1/3Mn_1/3O₂ and LiCoO₂. Overall, P and F codoping is an effective technique to improve the electrochemical performance of NCM622 and others layered materials.

具有高容量和相对低成本优点的富含镍的锂金属氧化物被认为是用于高能锂离子电池（LIB）的有前途的阴极材料。在此，将P和F离子引入共掺杂到市售的LiNi _0.6 Co _0.2 Mn _0.2 O ₂（NCM622）的晶体中，分别在过渡金属层和氧位处。因此，NCM622的晶格参数得以扩大，其表面结构也得以稳定，从而提高了循环性能和倍率性能。使用3％和6％LiPF ₆溶液的共掺杂样品的容量保持率为143.1 mAh g ^-1和143 mAh g ^-1（88.5％和的初始容量为88.3％）在56毫安克^-1在100次循环，其是7.3％比的未掺杂NCM622（133.3毫安克更高^-1，81.3％）。将电流密度进一步提高到280 mA g ^-1，对于6％的样品，在100个循环中实现了高达93.8％（134.5 mAh g ^-1）的容量保持率，与之相比，容量增加了17.4％未掺杂的。此外，我们发现P和F共掺杂还可以大大改善LiNi _1/3 Co _1/3 Mn _1/3 O ₂和LiCoO ₂的循环稳定性。。总体而言，P和F共掺杂是提高NCM622和其他层状材料电化学性能的有效技术。