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王滨,张海朗.高容量锂离子电池正极材料LiNi0.5Co0.2Mn0.3O2的制备与工艺优化[J].稀有金属材料与工程(英文),2018,47(9):2852~2856.[Wang Bin and Zhang Hailang.Preparation and process optimization of LiNi0.5Co0.2Mn0.3O2 as cathode material for high capacity lithium-ion battery[J].Rare Metal Materials and Engineering,2018,47(9):2852~2856.]
Preparation and process optimization of LiNi0.5Co0.2Mn0.3O2 as cathode material for high capacity lithium-ion battery
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Received:November 09, 2016  Revised:February 21, 2017
DOI:
Key words: Lithium ion battery  calcination temperature  LiNi0.5Co0.2Mn0.3O2  Synthesis technology
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Wang Bin and Zhang Hailang  
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Abstract:
      The precursor Ni0.5Co0.2Mn0.3(OH)2 is synthesized by hydroxide co-precipitation method, further high temperature solid state method is used to obtain the LiNi0.5Co0.2Mn0.3O2 by mixing with lithium source. The quality change of the precursor and lithium source during the high temperature calcination process and the effect of calcination process on the structure and properties of materials are discussed. Thermal gravimetric analysis (TGA) shows that there is little change in the material quality during the calcination process after 750℃. X-ray diffraction (XRD) indicates that all samples, which are synthesized from 750℃ to 900℃, have good α-NaFeO2 layered structure and small cation mixing degree. Scanning electron microscope shows that the material has a smooth surface and a uniform distribution of spherical structure. The material, calcined at 850℃, shows a initial discharge capacity of 193.7mA.h.g-1 in the voltage range of 2.5?4.6V at 25℃ and 0.2C, with the capacity retention rate of 94.2% after 30 cycles, which delivers the best electrochemical properties, including the rate capability.