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不同锂源对高温固相法制备NCM811正极材料储锂性能的影响
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桂林理工大学

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TM912

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广西自然科学基金(2018GXNSFBA281114, 2017GXNSFAA198117)


Influence of Lithium Sources on the Lithium ion Storage Performance of NCM811 Cathode Materials Prepared by High-Temperature Solid-State Reaction Method
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Guilin University of Technology

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    摘要:

    采用4种不同的锂盐(LiOH.H2O、Li2CO3、LiNO3、CH3COOLi),以高温固相法制备了LiNi0.8Co0.1Mn0.1O2正极材料。利用X射线粉末衍射(XRD)和场发射电子显微镜(FESEM)对所制LiNi0.8Co0.1Mn0.1O2材料的微观结构进行了表征,发现所有合成的LiNi0.8Co0.1Mn0.1O2样品尺寸均为微米级大小,具有层状结构(R-3m空间群)。电化学测试结果表明采用不同锂源制备的LiNi0.8Co0.1Mn0.1O2样品的电化学性能差别很大。其中采用LiOH?H2O为锂源,经500 °C预烧结6 h后,在800 °C下烧结16 h获得的样品锂镍混排程度最低,电化学性能最佳。例如,在0.1 C(1 C=180 mA/g)倍率下其可逆比容量高达206.2 mA.h/g,在10 C大倍率下,其可逆比容量仍保持有80.9 mA.h/g;在0.5 C倍率下100次充放电循环过程中,最高放电比容量为176.2 mA.h/g,平均放电比容量为140.1 mA.h/g。动力学及电极稳定性分析发现,LiOH?H2O制备的样品的电化学可逆性最好,Li+扩散系数最大,充放电循环过程中结构稳定性最好。

    Abstract:

    LiNi0.8Co0.1Mn0.1O2 cathode materials were prepared by a high-temperature solid-phase reaction method with Four different lithium salts (LiOH.H2O, Li2CO3, LiNO3, CH3COOLi) as lithium sources. The microstructure of the LiNi0.8Co0.1Mn0.1O2 materials was characterized by X-ray powder diffraction (XRD) and field emission electron microscopy (FESEM). The results demonstrated that the size of all the four synthesized LiNi0.8Co0.1Mn0.1O2 samples were micrometers size, with a layered structure (R-3m space group). The electrochemical test results showed that the electrochemical performance of LiNi0.8Co0.1Mn0.1O2 samples prepared with different lithium sources is very different. Among them, the LiNi0.8Co0.1Mn0.1O2 sample prepared with LiOH?H2O as lithium source (pre-sintering at 500 °C for 6 h and sintering at 800 °C for 16 h) exhibited the lowest degree of lithium-nickel mixing and the best electrochemical performance. For example, its reversible specific capacity is as high as 206.2 mA.h/g at a rate of 0.1 C (1 C=180 mA/g), and its reversible specific capacity remains 80.9 mA.h/g at a rate of 10 C; During 100 charge-discharge cycles at a rate of 0.5 C, the highest specific discharge capacity was 176.2 mA.h/g, and the average specific discharge capacity was 140.1 mA.h/g. The analysis of kinetics and electrode stability revealled that the LiNi0.8Co0.1Mn0.1O2 sample prepared with LiOH?H2O as lithium source possessed the best electrochemical reversibility, highest Li+ diffusion coefficient, and superior structural stability during charge-discharge cycling.

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芦志刚,李延伟,姜吉琼,李伟,姚金环.不同锂源对高温固相法制备NCM811正极材料储锂性能的影响[J].稀有金属材料与工程,2021,50(10):3757~3764.[Lu Zhigang, Li Yanwei, Jiang Jiqiong, Li Wei, Yao Jinhuan. Influence of Lithium Sources on the Lithium ion Storage Performance of NCM811 Cathode Materials Prepared by High-Temperature Solid-State Reaction Method[J]. Rare Metal Materials and Engineering,2021,50(10):3757~3764.]
DOI:10.12442/j. issn.1002-185X.20200839

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  • 收稿日期:2020-11-01
  • 最后修改日期:2020-12-15
  • 录用日期:2020-12-23
  • 在线发布日期: 2021-10-28
  • 出版日期: 2021-10-25