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-Mn双金属金属有机框架及其衍生品作为离子电池的阴极

Xinlei Zhang¹, Wenwen Zi², Juan Zhou¹

¹Henan Key Laboratory of Rare Earth Functional Materials, School of Chemistry and Chemical Engineering, Zhoukou Normal University, Zhoukou 466001, People's Republic of China.

Inorganic chemistry

|June 7, 2023

概括

这项研究合成了用于电池的螺旋式酸 (LiMn2O4) 阴极材料. 最佳的合成条件产生了高容量和稳定性,性能优于其他电池材料.

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
无机化学无机化学

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.
螺旋式酸 (LiMn2O4) 是一个有前途的阴极材料,因为它的低成本和良好的安全性.

研究的目的:

为了合成和表征螺旋类型的LiMn2O4阴极材料.
为了优化合成条件以提高电化学性能.
评估准备好的LiMn2O4.4的稳定性和容量保留.

主要方法:

双金属有机-无机混合复合物的溶热合成.
在各种大气层下进行高温化.
使用X射线衍射 (XRD) 和热重力测量分析 (TG) 的结构分析.
通过扫描电子显微镜 (SEM) 和X射线光电子谱学 (XPS) 进行形态和元素分析.
电化学性能测试,包括放电能力,速率能力和循环稳定性.

主要成果:

最佳的合成包括在空气中直接化前体复合物,在850°C下进行12小时的化.
由此产生的LiMn2O4的初始排放特异容量为95.9 mA hg-1在0.1 C和89.8 mA hg-1在1 C.
观察到出色的速率能力,在从5°C回归到0.1°C后,容量保留为91.6mA hg-1.
在1°C的500个循环后,该材料保留了80.7 mA hg−1 (89.9%的初始容量),显示出卓越的稳定性.

结论:

优化的LiMn2O4阴极材料显示出高性能离子电池的巨大潜力.
与LiCoO2和LiNiO2.2相比,合成材料具有增强的电化学稳定性和容量保留.
这项工作为准备用于储能应用的先进阴极材料提供了有效的策略.

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