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通过触发阳离子还氧化活性,对具有高容量的空气稳定铁基预化材料进行晶格调节

Bin Zhu¹, Wei Zhang², Shihao Li¹

¹School of Metallurgy and Environment, Hunan Provincial Key Laboratory of Nonferrous Value-Added Metallurgy, Engineering Research Center of the Ministry of Education for Advanced Battery Materials, Central South University, Changsha 410083, P. R. China.

ACS applied materials & interfaces

|February 14, 2025

概括

在Li5FeO4中的替代产生Li5.5Fe0.5Co0.5O4,增强离子氧化还原和空气稳定性,用于改进的离子电池阴极. 这种新型材料提供了更高的容量和更好的性能.

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:

Li5FeO4 (LFO) 显示出由于双阴离子和阴离子氧化还原的阴极前化有前途.
由于不完全的脱和空气降解,LFO的实际使用受到限制.
有效的补偿需要提高材料稳定性和氧化还原活性.

研究的目的:

通过晶格调制来增强Li5FeO4 (LFO) 的阳离子氧化还原活性和空气稳定性.
将引入LFO结构,以创建一个新的正极材料.
为了研究替代材料的电化学性能和稳定性.

主要方法:

在Li5FeO4.4中的铁位点通过替代进行格子调制.
新型化合物Li5.5Fe0.5Co0.5O4 (LFCO) 的合成.
电化学测试包括循环电压测量,静电电荷放电和长期循环.
在受控湿度下评估空气稳定性.

主要成果:

的结合促进了可逆的氧氧氧化还原 (O2-到O2).
与LFO相比,LFCO的特定容量显著更高 (860.1mAhg-1在0.1C,580.0mAhg-1在1C)
LFCO表现出增强的空气稳定性,在20%的相对湿度下4天后保留了520.8 mAh g-1.
带有LFCO的囊细胞在200个循环中显示89.6%的容量保留.

结论:

用替代进行格子调制是改善LFO性能的有效策略.
LFCO提供增强的阳离子氧化还原,优越的电化学容量和改善的空气稳定性.
LFCO显示出下一代高能离子电池的巨大潜力.

关键词:

5FeO4 的使用方法空气稳定性的空气稳定性阴离子氧化还原剂离子电池是一种离子电池.在化前进行化.

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