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快速固态脱/化FeF_x (x = 3-0) 作为化物离子电池阴极

Akira Yano¹, So Fujinami², Tomotaka Nakatani²

¹Research Institute of Electrochemical Energy, Department of Energy and Environment, National Institute of Advanced Industrial Science and Technology (AIST), 1-8-31 Midorigaoka, Ikeda, Osaka 563-8577, Japan.

ACS applied materials & interfaces

|September 29, 2025

概括

铁化物 (FeFx) 阴极显示出下一代离子电池的前景,提供高容量和出色的稳定性. 本研究探讨了它们的放电/充电机制和在不同温度下的性能.

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:

离子电池 (FIB) 正成为离子电池的有希望的替代品,因为它们具有更高能量密度的潜力.
化铁 (FeFx) 是一种具有高理论容量的阴极材料,但其电化学行为和反应机制尚不清楚.

研究的目的:

研究FeFx作为全固态FIB中的阴极材料的放电/充电能力和除/机制.
为了评估FeFx阴极在室温和低温下的电化学性能.

主要方法:

用于全固态FIB的FeFx薄膜阴极的制造.
电化学测试包括循环电压测量和在不同速度和温度下静电循环.
操作X射线吸收光谱 (XAS) 来阐明反应机制.
扫描电子显微镜 (SEM) 和X射线光电子光谱 (XPS) 用于结构和表面分析.

主要成果:

在室温0.1-1°C的速度下,FeFx阴极达到其理论容量的88-72%.
观察到出色的循环性,没有显著的过电压增加或容量降低.
阴极即使在-30°C下也能有效工作,这表明除化/化激活能量较低.
操作XAS证实FeF3,FeF2和Fe之间的可逆脱/化.
纳米结构的FeFx (大约. 在循环过程中保持了电极结构,这有助于稳定性.
电化学分析表明FeF2/Fe反应受到电荷转移的限制,这表明有动力优势.

结论:

FeFx是全固态离子电池的可行阴极材料,具有高容量和出色的循环稳定性.
FeFx电极的纳米结构在其卓越的循环性中起着至关重要的作用.
低温性能和电荷转移动力学突出了FeFx在FIB中的实际应用潜力.

关键词:

FeF3FeF3FeF3FeF3FeF3FeF3FeF3FeF3FeF3FeF3FeF3FeF3FeF3FeF3FeF3FeF3FeF3FeF3FeF3FeF3FeF3FeF3 这是一个全固态的全固态系统.转移费用转移费用转移费用转移费用甲化/化甲化离子电池是化物离子电池的一种.

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