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首页> 外文期刊>International Journal of Electrochemical Science >Lithium-ion Migration in Layered Li1.06Ni0.5Co0.2Mn0.3O2 Cathode Materials Synthesized at Different Temperatures
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Lithium-ion Migration in Layered Li1.06Ni0.5Co0.2Mn0.3O2 Cathode Materials Synthesized at Different Temperatures

机译：锂离子在层状Li 1.06 Ni 0.5 Co 0.2 Mn 0.3 O 2 中的迁移>在不同温度下合成的阴极材料

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摘要

We examined the effects of synthesis temperature on the structural and electrochemical properties of layered Li1.06Ni0.5Co0.2Mn0.3O2 cathode materials synthesized by co-precipitation. Scanning electron microscopy showed that a higher synthesis temperature resulted in a bigger primary particle size. Rietveld refinement revealed that the content of nickel ions at the 3b site decreased from 0.041 to 0.038 and subsequently increased to 0.064 as synthesis temperature rose from 800 to 980 °C. The incircle/circumcircle radii of the tetrahedral sites providing space for lithium-ion migration increased gradually with synthesis temperature. The Li1.06Ni0.5Co0.2Mn0.3O2 sample synthesized at 920 °C displayed the optimal electrochemical performance, delivering a discharge capacity of 181.6 mAhg?1 and initial coulombic efficiency of 84.2% at 0.1C between 2.5 and 4.5 V. Our analysis indicates that the level of cation mixing and the incircle/circumcircle radii of tetrahedral sites in LiNixCoyMnzO2 are the main factors that affect its electrochemical performance rather than primary particle size.
机译：我们研究了合成温度对通过共沉淀法合成的Li1.06Ni0.5Co0.2Mn0.3O2层状正极材料的结构和电化学性能的影响。扫描电子显微镜显示，较高的合成温度导致较大的初级粒径。 Rietveld精炼显示，随着合成温度从800°C升高到3b，镍离子在3b位的含量从0.041降低到0.038，随后增加到0.064。随着合成温度的升高，四面体位点的圆/圆半径为锂离子迁移提供了空间。在920°C合成的Li1.06Ni0.5Co0.2Mn0.3O2样品表现出最佳的电化学性能，在0.1至2.5C和2.5 V之间的放电容量为181.6 mAhg？1，初始库仑效率为84.2％。我们的分析表明LiNixCoyMnzO2中的阳离子混合水平和四面体位点的圆/圆半径是影响其电化学性能的主要因素，而不是一次粒径。

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