The LiNi_0.5–xMg_xMn_1.48Y_0.02O₄ (x = 0.005, 0.01, 0.03) and LiNi_0.5Mn_1.5O₄ (LNMO) cathode materials were synthesized successfully through a citric acid aided route. The relationship between material characteristics (structure and morphology) and electrochemical properties of LNMO cathode materials was investigated. It was found that synergistic effect of co-doped magnesium and yttrium ions resulted in marked enhancement of electrochemical properties of LNMO cathode. SEM observation showed that Mg-Y co-doped samples possessed spinel structure with truncated octahedron morphology. After co-doping Mg and Y, the XRD and TEM analyses showed that lattice parameters for LNMO samples were improved, thus improving the rate and cycling property. XPS results of Mg-Y co-doped spinel LiNi_0.5Mn_1.5O₄ indicated the presence of Mg²⁺ and Y³⁺ in the spinel lattice. Notably, LiNi_0.49Mg_0.01Mn_1.48Y_0.02O₄ exhibited both optimal cycling stability and rate performance. LiNi_0.49Mg_0.01Mn_1.48Y_0.02O₄ sample retained specific capacity of 131 mAh g⁻¹ after 100 cycles at high current density of 1 C with superior retention of 98.49% and the specific capacity reached 118 mAh g⁻¹ at 5 C. While undoped sample only retained 107 mAh g⁻¹ after 100 cycles at 1 C with lower retention of 94.69% and its specific capacity was 84 mAh g⁻¹ at 5 C.

LiNi _{0.5– x} Mg _x Mn _1.48 Y _0.02 O ₄ ( x  = 0.005, 0.01, 0.03) 和 LiNi _0.5 Mn _1.5 O ₄(LNMO)正极材料通过柠檬酸辅助途径成功合成。研究了 LNMO 正极材料的材料特性（结构和形貌）与电化学性能之间的关系。发现共掺杂镁和钇离子的协同作用导致LNMO阴极电化学性能的显着增强。SEM观察表明Mg-Y共掺杂样品具有尖晶石结构，截头八面体形貌。共掺杂Mg和Y后，XRD和TEM分析表明LNMO样品的晶格参数得到改善，从而提高了倍率和循环性能。Mg-Y 共掺杂尖晶石 LiNi _0.5 Mn _1.5 O _{4 的}XPS 结果表明存在 Mg ²⁺和 Y ³⁺在尖晶石晶格中。值得注意的是，LiNi _0.49 Mg _0.01 Mn _1.48 Y _0.02 O ₄表现出最佳的循环稳定性和倍率性能。LiNi _0.49 Mg _0.01 Mn _1.48 Y _0.02 O ₄样品在1 C的高电流密度下循环100次后保持131 mAh g ^-1的比容量，保持率高达98.49% ，5 C时的比容量达到118 mAh g ^-1。而未掺杂的样品仅保留了 107 mAh g ^-1在 1 C 下循环 100 次后，保留率较低，为 94.69% ，5 C 下的比容量为 84 mAh g ^-1。