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基于Mn/Fe的高热层阴极,具有抑制的P2-P'2过渡和低张力,用于快速稳定的离子存储

Ziqing Wang¹, Shengfeng Zhang¹, Xiaoguang Fu¹

¹College of Materials Science and Engineering, Huaqiao University, Xiamen 361021, People's Republic of China.

ACS applied materials & interfaces

|January 4, 2024

概括

高层氧化物通过增强结构稳定性和防止有害扭曲,为离子电池 (SIB) 提供了更好的性能. 这种设计导致SIB阴极具有更高的容量和更好的速率能力.

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:

基于/铁的分层氧化物是对离子电池 (SIB) 的有希望的阴极材料,因为它们的容量和资源可用性很高.
挑战包括复杂的相位过渡和显著的体积变化,阻碍实际应用.

研究的目的:

设计和制造一种基于Mn/Fe的高层氧化物 (Mn-Fe-HEO),作为SIB的优质阴极材料.
调查高对结构稳定性和电化学性能的影响,与低对应物相比.

主要方法:

高的P2-Na_0.67Mn_0.5Fe_0.334Cu_0.045Mg_0.014Ti_0.014Al_0.014Zr_0.014Sn_0.014O₂ (Mn-Fe-HEO) 和低的Na_0.67Mn_0.5Fe_0.334Cu_0.164O₂ (Mn-Fe-LEO) 的合成,这些化合物在化过程中被发现是具有性的.
在1.5-4.3V范围内对SIB阴极进行电化学测试.
现场X射线衍射,扩散动力学测试和微观结构的表征.

主要成果:

与Mn-Fe-LEO相比,Mn-Fe-HEO显示出明显更高的可逆能力和更高的速度能力.
高性兴奋剂增强了结构稳定性,抑制了Mn3+ Jahn-Teller扭曲和稳定了Na+扩散通道.
在Mn-Fe-HEO中观察到促进平滑的Na+转移和稳定,快速的氧化还原电化学.

结论:

高工程有效地提高了SIBs的分层氧化物阴极的结构完整性和电化学性能.
该研究提供了对结构-性质关系的洞察,指导了先进的高分层阴极的开发.

关键词:

具有高的高.低应变的低应变阶段过渡 - 阶段过渡.基于的分层阴极.离子电池是一种离子电池.

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