Synthesis by Electrolysis of Iron-Based Fluoride as Cathode Materials for Lithium Ion Batteries

IF 2.1 4区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY Electronic Materials Letters Pub Date : 2024-01-10 DOI:10.1007/s13391-023-00478-5

Zengzeng Zheng, Jin Shi, Xujie Xiao, Xu Li, Jingkang Chen, Chengfei Zhu

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Abstract

The hydrated iron fluoride (Fe₃F₈·2H₂O) with mixed valence cations is successfully synthesized through a rapid electrolytic synthesis route for the first time using low-concentration HF solution as fluorine source and cheap carbon steel as iron source. By controlling the value of current density, submicron structured hydrated iron fluoride with different grain sizes is obtained. The thermal behavior of Fe₃F₈·2H₂O under air atmosphere is studied. The product cooling to room temperature after heat treatment is FeF_2.2(OH)_0.8·0.33H₂O, which is determined by X-ray diffraction (XRD), X-ray photoelectron spectra (XPS), Fourier transform infrared spectrometer (FT-IR), and thermogravimetry/differential scanning calorimetry (TG/DSC). The evaluation of the electrochemical performance of FeF_2.2(OH)_0.8·0.33H₂O as a cathode for lithium batteries shows that it has an initial discharge capacity as high as 580 mAh g⁻¹ in a wide voltage range of 1.0–4.5 V at a current density of 20 mA g⁻¹, but the cycle performance is not very satisfactory, only 170 mAh g⁻¹ after 50 cycles.

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通过电解合成作为锂离子电池阴极材料的铁基氟化物

以低浓度 HF 溶液为氟源，廉价碳钢为铁源，通过快速电解合成路线首次成功合成了具有混合价阳离子的水合氟化铁（Fe3F8-2H2O）。通过控制电流密度值，获得了不同晶粒尺寸的亚微米结构水合氟化铁。研究了 Fe3F8-2H2O 在空气环境下的热行为。通过 X 射线衍射 (XRD)、X 射线光电子能谱 (XPS)、傅立叶变换红外光谱仪 (FT-IR) 和热重/差示扫描量热仪 (TG/DSC) 测定了热处理后冷却至室温的产物 FeF2.2(OH)0.8-0.33H2O。对 FeF2.2(OH)0.8-0.33H2O作为锂电池正极的电化学性能评估表明，在 20 mA g-1 的电流密度下，它在 1.0-4.5 V 的宽电压范围内的初始放电容量高达 580 mAh g-1，但循环性能并不十分理想，循环 50 次后仅为 170 mAh g-1。

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来源期刊

Electronic Materials Letters 工程技术-材料科学：综合

CiteScore

4.70

自引率

20.80%

发文量

审稿时长

2.3 months

期刊介绍： Electronic Materials Letters is an official journal of the Korean Institute of Metals and Materials. It is a peer-reviewed international journal publishing print and online version. It covers all disciplines of research and technology in electronic materials. Emphasis is placed on science, engineering and applications of advanced materials, including electronic, magnetic, optical, organic, electrochemical, mechanical, and nanoscale materials. The aspects of synthesis and processing include thin films, nanostructures, self assembly, and bulk, all related to thermodynamics, kinetics and/or modeling.