Chiolite Na5Ti3F14: A novel sodium titanium fluoride anode for low-cost and high-performance Na-ion batteries
- Authors
- Kang, Jungmin; Ahn, Jinho; Lee, Yongseok; Park, Hyunyoung; Ko, Wonseok; Ku, Bonyoung; Choi, Myungeun; Ryu, Won-Hee; Kim, Jongsoon
- Issue Date
- Nov-2023
- Publisher
- ELSEVIER
- Keywords
- Na-ion batteries; anode; Conversion reaction; Fluoride; Na5Ti3F14
- Citation
- ENERGY STORAGE MATERIALS, v.63
- Journal Title
- ENERGY STORAGE MATERIALS
- Volume
- 63
- URI
- https://scholarworks.sookmyung.ac.kr/handle/2020.sw.sookmyung/159512
- DOI
- 10.1016/j.ensm.2023.103048
- ISSN
- 2405-8297
2405-8289
- Abstract
- Fluoride-based conversion reaction electrode materials offer exceptional theoretical capacity merit for Na-ion batteries. Nevertheless, it has rarely been considered as potential anode material candidate due to (i) excessive redox potential (> 3 V) and (ii) intrinsically low reaction kinetics related to sluggish structural reorganization process. In this work, we demonstrate that chiolite Na5Ti3F14/carbon nanocomposite can deliver the outstanding electrochemical performances as the promising anode for Na-ion batteries, such as a large specific capacity of similar to 425 mAh g(-1) at 10 mA g(-1) with a low average operating voltage, the capacity retention of similar to 78 % compared to the initial capacity after 300 cycle with a high Coulombic efficiency of above 99 %, etc. We demonstrate that the chiolite Na5Ti3F14 phase can store the similar to 8.33 mol Na ions through the following conversion reaction; Na5Ti3F14 + 9Na + 9e(-) double left right arrow 3Ti + 14NaF, which is clearly confirmed by various ex-situ analyses using Xray diffraction, synchrotron-based X-ray adsorption spectroscopy, etc. We expect that this research can provide guidance toward the development of a new class of low-cost and high-performance anode materials, not only for Na-ion batteries but also for other rechargeable batteries.
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