以碳酸锂及镍钴锰氢氧化物前驱体为原料，通过固相烧结法制备成D50为7.7、19.92 μm的两种规格的锂离子电池三元材料NCM-S和NCM-B。按NCM-B质量占比为20%~90%，将上述两种材料掺混获得系列化的样品。采用激光粒度分析仪、振实密度仪、扫描电子显微镜、充放电测试仪对材料的物理及电化学性能进行分析测试。结果表明：与大颗粒样品NCM-B相比，NCM-80%样品振实密度由2.90 g/cm3提高至2.96 g/cm3，放电比容量由 176.3 mA·h/g提升到178.6 mA·h/g，100周循环容量保持率由91.9%提升至92.7%。以上结果可以归因于小颗粒在紧密堆积的大颗粒中的填隙作用，改善了活性材料的导电网络，提高了电池的能量密度。

LiNi0.5Co0.2Mn0.3O2（NCM） cathode material samples with D50 at 7.7 μm（NCM-S） and 19.9 μm（NCM-B） were synthe sized by solid state method using lithium carbonate and nickel cobalt manganese hydroxide precursor as raw materials.A se ries of samples were obtained by blending the above two materials according to NCM-B mass fraction in the range of 20%~ 90%.Physical and electrochemical properties of these samples were analyzed and tested by laser particle size analyzer，tap den sity meter，SEM and battery test equipment.Compared with NCM-B sample，the tap density of NCM-80% increased to 2.96 g/cm3 from 2.90 g/cm3.The initial capacity raised to 178.6 mA·h/g from 176.3 mA·h/g，and the capacity retention of 100th cycles raised to 92.7% from 91.9%.These results can be attributed to the infilling effect of small particles into the voids of big particles with close packing，which improves the conductive network of active materials and increases energy density of batteries.