Changes in Structure and Valence of Iron-Based Positive Electrodes in All-Solid-State Fluoride Batteries

IF 3.3 3区化学 Q2 CHEMISTRY, PHYSICAL

The Journal of Physical Chemistry C Pub Date : 2025-06-21 DOI:10.1021/acs.jpcc.5c01763

Miki Yamamoto, Yasuhiro Takabayashi, Keisuke Kibino, Koji Kimura, Atsushi Inoishi, Akira Yano, Kazuki Yoshii, Hikari Sakaebe, Masahiro Shikano, Tomotaka Nakatani, So Fujinami, Koichi Hayashi

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Abstract

All-solid-state fluoride batteries are candidates for postlithium-ion batteries with high energy density and safety. Among metal fluorides, FeF₃, a fluorinated form of abundant iron, is one of the attractive candidate materials for a positive electrode due to its high capacity. To investigate the cause of the deterioration of the cycle characteristics of all-solid-state fluoride batteries using FeF₃, it is necessary to have a detailed understanding of the significant volume change that occurs during charging and discharging and the incomplete Fe oxidation–reduction reaction. Reaction distribution is unavoidable in the electrode reactions of solid-state batteries. We therefore investigated the changes in valence and structure using a simultaneous small-angle X-ray scattering/X-ray diffraction/X-ray absorption near edge structures measurement system. Combining these results, we could obtain a model for the shape changes of Fe-related particles in the positive electrode.

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全固态氟化物电池中铁基正极结构与价态的变化

全固态氟化物电池具有高能量密度和安全性，是后锂离子电池的候选材料。在金属氟化物中，FeF3是一种丰富的铁的氟化形式，由于其高容量而成为极具吸引力的候选材料之一。为了研究使用FeF3的全固态氟化物电池循环特性恶化的原因，有必要详细了解充放电过程中发生的显著体积变化和Fe氧化还原反应不完全。在固态电池的电极反应中，反应分布是不可避免的。因此，我们利用小角x射线散射/ x射线衍射/ x射线吸收同步近边结构测量系统研究了价态和结构的变化。结合这些结果，我们可以得到正极中铁相关颗粒形状变化的模型。

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来源期刊

The Journal of Physical Chemistry C 化学-材料科学：综合

CiteScore

6.50

自引率

8.10%

发文量

2047

审稿时长

1.8 months

期刊介绍： The Journal of Physical Chemistry A/B/C is devoted to reporting new and original experimental and theoretical basic research of interest to physical chemists, biophysical chemists, and chemical physicists.