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合成和结构稳定不规则的岩盐Mn/V基氧化物作为离子电池的阴极材料

Iris Blumenhofer¹, Yasaman Shirazi Moghadam¹, Abdel El Kharbachi¹

¹Helmholtz Institute Ulm (HIU), Helmholtzstr. 11, Ulm89081, Germany.

ACS materials Au

|December 13, 2023

概括

这项研究合成了基于的新型无序岩盐氧化物,作为离子电池的高效阴极材料. 热处理提高了结构稳定性,提高了容量保留和循环性能.

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
储能储能储能储能储能储能

背景情况:

对于高性能,低成本,环保的离子电池阴极材料的需求日益增加.
基于的材料由于丰富和低成本而具有潜力.
无序的岩盐氧化物是有希望的阴极候选物.

研究的目的:

使用机械化学球磨机合成基于的无序岩盐氧化物Li2Mn1-xVxO2F (0 ≤ x ≤ 0.5).
研究瓦纳替代和热处理对电化学性质的影响.
分析结构性,形态性和电子性质,以优化阴极性能.

主要方法:

合成的高能机械化学球磨.
粉末X射线衍射 (PXRD) 和电子显微镜 (SEM/TEM) 用于结构和形态分析.
射线吸收近边结构 (XANES) 谱学用于氧化状态的确定.
电化学循环测试以评估性能.

主要成果:

热处理增加了对称性,并减少了球磨化合物的缺陷.
热处理对容量保留产生了积极的影响 (在100个循环后≤81%),速度能力和电荷转移阻力降低.
结构改进减轻了表面/散装缺陷,提高了阴极稳定性.
分析了替代对性能的影响.

结论:

热处理是稳定以为基础的石盐氧化酸的有益过程.
这些材料有望成为离子电池的阴极候选者,具有更好的稳定性和性能.
对缺陷缓解和化程度的进一步研究是有必要的.

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