This work provides a new strategy for using the combined effect of coating-CaF₂ and La-doping to improve the electrochemical performance of lithium-rich layer material. Here, La-doping in metal transition(MT) layer is employed to block the migration channel of TM ions and stabilize the crystal structure, and coating-CaF₂ on the surface of lithium-rich layer oxide material is employed to retard the side reaction between active material and electrolyte. Benefiting from the combined effect of coating-CaF₂ and La-doping, CaF₂ coated Li_1.2Mn_0.52Ni_0.13Co_0.13La_0.02O₂ exhibits excellent cycling performance and voltage stability. CaF₂ coated Li_1.2Mn_0.52Ni_0.13Co_0.13La_0.02O₂ delivers the initial discharge capacity of 227.1 mAh g⁻¹ at 0.5 C. After 100 cycles, its retention of discharge capacity is 93.9%, and its voltage decay is only 0.203 V. This connecting mechanism of coating and doping, which can avoid the insufficient of single coating or single doping, is very helpful to develop effective strategies for the modification of Li-rich oxide materials.

这项工作为利用涂层CaF ₂和La掺杂的组合效应改善富锂层材料的电化学性能提供了一种新的策略。在此，通过在金属过渡（MT）层中进行La掺杂来阻断TM离子的迁移通道并稳定晶体结构，并在富锂层氧化物材料的表面上涂覆CaF ₂来延迟副反应。在活性材料和电解质之间。受益于CaF ₂涂层和La掺杂的共同作用，CaF ₂涂层Li _1.2 Mn _0.52 Ni _0.13 Co _0.13 La _0.02 O ₂具有出色的循环性能和电压稳定性。CaF ₂涂层的Li _1.2 Mn _0.52 Ni _0.13 Co _0.13 La _0.02 O ₂在0.5 C时的初始放电容量为227.1 mAh g ^-1。经过100次循环后，其放电容量保持率为93.9％，电压衰减仅为0.203五，这种涂层与掺杂的连接机制，可以避免单层或单层掺杂不足，对于开发有效的富锂氧化物材料改性策略非常有帮助。