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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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TM912

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    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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[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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History
  • Received:November 01,2020
  • Revised:December 15,2020
  • Adopted:December 23,2020
  • Online: October 28,2021
  • Published: October 25,2021