Spinel LiNi_0.5Mn_1.5O₄, which is considered as one of the most attractive candidates for high energy density battery due to its high voltage platform over 4.7 V, suffers from the side reactions with electrolyte, strong oxidability of Ni⁴⁺ and therefore the complicated and frangible Solid Electrolyte Interfaces (SEI) layer that hinders the practical application of LiNi_0.5Mn_1.5O₄. In this work, traditional co-precipitation method is applied and improved by anion and cation doping method to construct superior interface on the surface of LiNi_0.5Mn_1.5O₄ to suppress side reactions especially at high temperature. Detailed properties including structure, morphology and electrochemical performance of pristine sample, single-doped and co-doped samples are probed. Physical characterizations reveal that the co-doped sample with regular octahedron has a moderate grain size and specific surface area between Al and F single doping, and holds the advantages of rate performance and capacity retention causing by Al doping and better stability under high temperature constructing by F. It exhibits the best capacity retention of 92% after 200 cycles under 55 °C, which is higher than that of the pristine sample (87%). Analysis of the electrode after cycling shows that doping reduces the thickness of the electrode interface film and the content of inorganic substances such as LiF to improve the interface characteristics and the high temperature cycling performance. This work has certain significance for the commercial application of LiNi_0.5Mn_1.5O₄.

尖晶石型LiNi _0.5 Mn _1.5 O ₄，由于其高于4.7 V的高压平台，被认为是高能量密度电池最有吸引力的候选材料之一，它具有与电解液的副反应，Ni ^4+的强氧化性以及因此受到的负面影响。复杂易碎的固体电解质界面（SEI）层阻碍了LiNi _0.5 Mn _1.5 O ₄的实际应用。在这项工作中，应用传统的共沉淀法并通过阴离子和阳离子掺杂法对其进行改进，以在LiNi _0.5 Mn _1.5 O ₄表面上形成优良的界面。以抑制副反应，尤其是在高温下。探究了原始样品，单掺杂和共掺杂样品的详细特性，包括结构，形态和电化学性能。物理特征表明，具有正八面体的共掺杂样品具有适度的晶粒尺寸，且在Al和F单掺杂之间具有比表面积，并具有由Al掺杂引起的速率性能和容量保持性的优点，以及在高温构筑下具有更好的稳定性。 F.在55°C下进行200次循环后，它表现出最佳的容量保持率，为92％，高于原始样品（87％）。循环后对电极的分析表明，掺杂降低了电极界面膜的厚度和无机物质（例如LiF）的含量，从而改善了界面特性和高温循环性能。这项工作对LiNi的商业应用具有一定的意义。_0.5 Mn _1.5 O ₄。