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对使用单相岩盐氧化物前体的NMC622阴极全干合成的新见解

Mohammad H Tahmasebi¹, Mark N Obrovac^1,2,3

¹Department of Chemistry, Dalhousie University, Halifax, Nova Scotia B3H 4R2, Canada.

|January 15, 2024

概括

这项研究表明,多余的可以提高LiNi$_{0.6}$Mn$_{0.2}$Co$_{0.2}$O$_{2}$ (NMC622) 阴极性能和同质性. 岩盐前体化发生在更高的温度下,影响NMC合成和颗粒大小.

科学领域:

材料科学材料科学材料科学
电化学电化学电化学
固态化学固态化学

背景情况:

开发先进的正极材料对于高性能离子电池至关重要.
合成LiNi$_{0.6}$Mn$_{0.2}$Co$_{0.2}$O$_{2}$ (NMC622) 经常涉及复杂的过程.
了解前体化动力学是控制材料性质的关键.

研究的目的:

通过使用一种新的岩盐 (RS) 氧化物前体,研究NMC622的全干合成.
阐明含量过多对NMC阴极性能和同质性的影响.
与传统的氧化物前体相比,分析RS前体的化行为.

主要方法:

完全干燥的合成NMC622.2.
在现场进行X射线衍射 (XRD) 分析.
电化学性能测试电化学性能测试.

主要成果:

增加过量的含量提高了NMC电化学性能和同质性.
与氧化物前体 (~350 °C) 相比,RS前体的化在更高的温度 (~450 °C) 开始.
液体在RS前体合成过程中形成的液体加速了化和增加了初级粒子大小.

结论:

该RS前体为NMC622合成提供了可行的途径,具有增强的特性.
优化含量对于最大化RS前体的好处至关重要.
RS前体的独特化途径影响NMC微观结构和电化学特征.

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