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CSTR系统制备高性能Ni0.6Co0.2Mn0.2(OH)2及电化学性能研究
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大连海事大学 交通运输工程学院

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国家自然科学基金资助(51479019,21476035);中央高校基本科研业务费(3132016341)


Synthesization and electrochemical properties of Ni0.6Co0.2Mn0.2(OH)2 ternary cathodes for lithium batteries in the system of CSTR
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Institute of Traffic and Transportation Engineering,Dalian Maritime University,Dalian

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    摘要:

    采用共沉淀法在CSTR(连续搅拌反应器系统)工艺体系中批量合成出镍钴锰三元氢氧化物前驱体Ni0.6Co0.2Mn0.2(OH)2 (622),掺入适量的Li2CO3高温焙烧后得到锂离子二次电池正极材料Li[Ni0.6Co0.2Mn0.2]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,充放电循环测试系统测试其电化学性能。SEM测试表明产物为二次粒子团聚而成类球形颗粒;XRD及TEM结果表明合成的样品具有典型的层状α-NaFeO2结构。在电压范围为2.8 V-4.3 V,0.2 C倍率条件下,首次充放电容量分别为206 mAh g-1 和176 mAh g-1,100次循环后容量保持率达到85%。

    Abstract:

    Ni0.6Co0.2Mn0.2(OH)2 as precursor of lithium-ion batteries ternary cathode material was prepared for batch preparation by a hydroxyl co-precipitation method in the system of CSTR (continuous stirred tank reactor). Then, the Ni0.6Co0.2Mn0.2(OH)2 was roasted with Li2CO3 to receive Li[Ni0.6Co0.2Mn0.2]O2 under 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[Ni0.6Co0.2Mn0.2]O2. The resulting Li[Ni0.6Co0.2Mn0.2]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 have a good electrochemical reversibility and much better cycling stability in the voltage range of 2.8 and 4.3 V. Its initial charge and discharge specific capacity are as high as 206 mAh g-1 and 176 mAh g-1 at 0.2 C, with a capacity retention rate of 85% after 100 cycles.

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崔永福,崔金龙,满建宗,程付鹏,张鹏超,李 嵩,文钟晟,孙俊才. CSTR系统制备高性能Ni0.6Co0.2Mn0.2(OH)2及电化学性能研究[J].稀有金属材料与工程,2019,48(2):587~593.[Cui Yongfu, Cui Jinlong, Man Jianzong, Cheng Fupeng, Zhang Pengchao, Li Song, Wen Zhongsheng, Sun Juncai. Synthesization and electrochemical properties of Ni0.6Co0.2Mn0.2(OH)2 ternary cathodes for lithium batteries in the system of CSTR[J]. Rare Metal Materials and Engineering,2019,48(2):587~593.]
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  • 收稿日期:2017-07-08
  • 最后修改日期:2017-10-27
  • 录用日期:2017-11-08
  • 在线发布日期: 2019-03-15
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