Layered Li-rich manganese-based cathode material, Li_1.2Ni_0.13Co_0.13Mn_0.54O₂, is prepared by a facile solvothermal method, followed by calcination at high temperature. After that, an effective surface modification approach including the pre-coating of dopamine layer and subsequent heating treatment in air is used to synthesize layered-spinel heterostructured Li-rich cathode material. After surface modification, spinel nanoparticles uniformly distribute on the surface of Li-rich cathode material and, as a result, the electrochemical performances of the collected layered-spinel heterostructured cathode material are improved significantly. The produced layered-spinel heterostructured cathode material exhibits a high initial discharge capacity of 276 mA h g⁻¹ at 0.1 C with an enhanced initial Coulombic efficiency of 87.6%. The reversible capacities are 246 mA h g⁻¹ after 100 cycles at 0.2 C with a capacity retention of 90.9% and 231 mA h g⁻¹ after 200 cycles at 1 C with a capacity retention of 95.8%. The reasons for the greatly enhanced electrochemical properties of layered-spinel heterostructured cathode material are discussed in detail.

层状富锂锰正极材料Li _1.2 Ni _0.13 Co _0.13 Mn _0.54 O ₂通过容易的溶剂热法制备，然后在高温下煅烧。之后，使用一种有效的表面改性方法，包括对多巴胺层进行预涂和随后在空气中进行热处理，以合成层状-尖晶石异质结构的富锂正极材料。表面改性后，尖晶石纳米颗粒均匀地分布在富锂正极材料的表面上，结果，所收集的层状-尖晶石异质结构正极材料的电化学性能得到了显着改善。所生产的层状-尖晶石异质结构阴极材料在0.1C下显示出276 mA h g ^-1的高初始放电容量，并且初始库仑效率提高了87.6％。可逆容量为246 mA h g ^-1在0.2 C下进行100次循环后，容量保持率为90.9％；在1 C下进行200次循环后，容量保持率为95.8％，而231 mA h g ^-1。详细讨论了层状尖晶石异质结构阴极材料电化学性能大大提高的原因。