Electrochemical reactions in fluoride-ion batteries: mechanistic insights from pair distribution function analysis,Journal of Materials Chemistry A

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Electrochemical reactions in fluoride-ion batteries: mechanistic insights from pair distribution function analysis
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2017-07-05 00:00:00 , DOI: 10.1039/c7ta04005a
Antonin Grenier _{1,

2,

3,

4,

5} , Ana-Gabriela Porras-Gutierrez _{1,

2,

3,

4,

5} , Henri Groult _{1,

2,

3,

4,

5} , Kevin A. Beyer _{6,

7,

8,

9,

10} , Olaf J. Borkiewicz _{6,

7,

8,

9,

10} , Karena W. Chapman _{6,

7,

8,

9,

10} , Damien Dambournet _{1,

2,

3,

4,

5}

Affiliation

Detailed analysis of electrochemical reactions occurring in rechargeable Fluoride-Ion Batteries (FIBs) is provided by means of synchrotron X-ray diffraction (XRD) and Pair Distribution Function (PDF) analysis. In this study, a symmetrical cell containing Bi–BiF₃ composite electrodes was characterized after three cycles. As for Li conversion-based electrodes, our study confirms that a multi-electron redox process occurs between Bi metal and BiF_3. XRD and PDF analyses show that multiple Bi oxyfluoride phases are formed due to the presence of Bi oxide in the initial Bi electrode and/or Bi oxyfluoride in the initial BiF₃ electrode. Quantitative PDF analysis suggests that oxygen does not migrate through the electrolyte and that the fluoride ion is the sole charge transfer anion. Hence, we showed that oxide species do not prevent the electrochemical reactions, opening the path for the study of metal oxyfluorides as active materials for FIBs.

中文翻译：

氟离子电池中的电化学反应：对对分布函数分析的机理见解

借助于同步加速器X射线衍射（XRD）和成对分布函数（PDF）分析，详细分析了可充电氟离子电池（FIB）中发生的电化学反应。在这项研究中，经过三个循环后，对包含Bi–BiF ₃复合电极的对称电池进行了表征。对于基于Li转换的电极，我们的研究证实了Bi金属和BiF ₃之间发生了多电子氧化还原过程。XRD和PDF分析表明，由于初始Bi电极中存在Bi氧化物，形成了多个Bi氟氧化物相。和/或初始BiF _3中的氟化氧双电极。PDF的定量分析表明，氧不会通过电解质迁移，而氟离子是唯一的电荷转移阴离子。因此，我们证明了氧化物不会阻止电化学反应，为研究金属氧氟化物作为FIB的活性材料开辟了道路。

更新日期：2017-07-21

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