Cobalt-free LiNi_0.5Mn_1.5O₄ (Lithium Nickel Manganese Oxide; LNMO) has garnered considerable interest as a cathode material due to its high working voltage, lower cost, and environmental friendliness. However, LNMO cathodes currently exhibit low cyclability and capacity deterioration, severely restricting their use on a broader scale. To this end, microwave-assisted chemical co-precipitation was used to produce spherical aggregated nanoparticles of LiNi_0.5Mn_1.5O₄ (LNMO) coated with CeO₂ (LNMO-Ce) and wrapped in graphene (LNMO-Ce-GO). Structural analysis demonstrates that the ceria coating along with the graphene wrapping prevents unwanted phases from forming and altering the morphology of the LNMO microspheres. LNMO-Ce-GO exhibits a discharge capacity of 132.4 mAhg⁻¹ at the C/10 rate with a capacity retention of 95.3 % after 100 cycles, compared to LNMO-Ce and bare LNMO samples that provide a capacity retention of 91.6 % and 84.7 % respectively. DSC analysis elucidate that the ceria coating helps to suppress the adverse reactions at the electrode/electrolyte interface and reduce the Mn³⁺ dissolution due to the Jahn Teller effect, increasing cell cyclability. The graphene wrapping reduces material aggregation and provides conductive pathways that significantly improve the electrochemical performance of the LNMO cathode. This innovative material design strategy can be efficiently expanded to other classes of lithium-ion battery cathode materials to enhance their electrochemical performance.

无钴 LiNi _0.5 Mn _1.5 O ₄（锂镍锰氧化物；LNMO）由于其高工作电压、低成本和环境友好性而作为正极材料引起了广泛关注。然而，LNMO正极目前表现出低循环性和容量退化，严重限制了它们在更广泛的范围内的使用。为此，利用微波辅助化学共沉淀法制备了包覆有CeO _{2的LiNi 0.5} Mn _1.5 O _{4 (LNMO)球形聚集纳米粒子}(LNMO-Ce) 并包裹在石墨烯中 (LNMO-Ce-GO)。结构分析表明，二氧化铈涂层和石墨烯包裹物可防止不需要的相形成和改变 LNMO 微球的形态。LNMO-Ce-GO 在 C/10 倍率下的放电容量为 132.4 mAhg ^-1，100次循环后的容量保持率为 95.3%，而 LNMO-Ce 和裸露的 LNMO 样品的容量保持率为 91.6% 和 84.7% ％ 分别。DSC分析表明，二氧化铈涂层有助于抑制电极/电解质界面的不良反应，降低Mn ³⁺由于 Jahn Teller 效应而溶解，增加了细胞的可循环性。石墨烯包裹减少了材料聚集并提供了显着改善 LNMO 阴极电化学性能的导电通路。这种创新的材料设计策略可以有效地扩展到其他类别的锂离子电池正极材料，以提高其电化学性能。