Tunnel-type β-FeOOH cathode material for high rate sodium storage via a new conversion reaction
- Authors
- Cho, Min Kyoung; Jo, Jae Hyeon; Choi, Ji Ung; Kim, Jongsoon; Yashiro, Hitoshi; Yuan, Shuai; Shi, Liyi; Sun, Yang-Kook; Myung, Seung-Taek
- Issue Date
- Nov-2017
- Publisher
- ELSEVIER SCIENCE BV
- Keywords
- Hollandite; beta-FeOOH; Conversion; Cathode; Sodium; Battery
- Citation
- NANO ENERGY, v.41, pp.687 - 696
- Indexed
- SCIE
SCOPUS
- Journal Title
- NANO ENERGY
- Volume
- 41
- Start Page
- 687
- End Page
- 696
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/5349
- DOI
- 10.1016/j.nanoen.2017.10.022
- ISSN
- 2211-2855
- Abstract
- We have investigated a tunnel-type β-FeOOH cathode material for rapid sodium storage. Rietveld refinement of the X-ray diffraction (XRD) data obtained for β-FeOOH indicated that the structure was stabilized into [2 × 2] hollandite tunnel structure, and the adhesion of the β-FeOOH onto carbon nanotubes (CNTs) led to a high electrical conductivity of 3 S cm−1. As a result, the β-FeOOH/CNTs composite electrode showed excellent electrode performance, with a discharge capacity of 205 mAh g−1 and a coulombic efficiency of 88.5% in the voltage range of 1.1–4 V during the first cycle, 131 mAh g−1 after 200 cycles, and a capacity retention of 70% over 300 cycles at 10 C (1920 mA g−1). Based on the XRD, X-ray absorption, and time-of-flight secondary-ion mass spectroscopy results, we suggest a new conversion mechanism for the β-FeOOH cathode material in Na cells, namely, FeOOH + Na+ + e- → FeO + NaOH. This conversion reaction produces NaOH as a byproduct, and the reaction is fairly reversible even at 10 C-rates.
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