【摘要】 采用共沉淀法在连续搅拌反应器系统（CSTR）工艺体系中批量合成出镍钴锰三元氢氧化物前驱体Ni_0.6Co_0.2Mn_0.2（OH）₂（622）,掺加适量的Li₂CO₃高温焙烧后得到锂离子二次电池正极材料Li[Ni_0.6Co_0.2Mn_0.2]O₂。使用扫描电子显微镜（SEM）观察样品形貌,X射线衍射仪（XRD）及透射电子显微镜（TEM）分析合成样品的具体结构,利用充放电循环测试系统测试其电化学性能。结果表明,产物为二次粒子团聚而成近似球形颗粒;合成的样品具有典型的层状α-NaFeO₂结构。在电压范围为2.8～4.3 V,1 C倍率条件下,首次充放电容量分别为206和176 mAh·g^-1,100次循环后库伦效率达到了85%。更多还原

【Abstract】 Ni_0.6Co_0.2Mn_0.2（OH）₂ as a precursor of lithium-ion battery ternary cathode material was prepared in batches by a hydroxyl co-precipitation method in the system of CSTR（continuous stirred tank reactor）. Then, Ni_0.6Co_0.2Mn_0.2（OH）₂ was roasted with Li₂CO₃ to obtain Li[Ni_0.6Co_0.2Mn_0.2]O₂ at a high temperature in the air. Scanning electron microscope（SEM）, X-ray diffraction（XRD） and transmission electron microscope（TEM） were used to examine the morphology and structure of the obtained Li[Ni_0.6Co_0.2Mn_0.2]O₂. The resulting Li[Ni_0.6Co_0.2Mn_0.2]O₂ powders have a type of spherical structure composed of secondary particles with a typical α-NaFeO₂ lamellar structure. The electrochemical tests indicate that this cathode material has a good electrochemical reversibility and better cycle stability in the voltage range of 2.8～4.3 V. Its initial charge and discharge specific capacity is as high as 206 and 176 mAh·g^-1 at 1 C,respectively, and the coulombic efficiency exceeds 85% after 100 cycles.更多还原