A comparative study of increased lithium storage with low resistance at structural defects in amorphous titanium dioxide electrode
- Authors
- Chae, Oh B.; Wu, Mihye; Lee, Jeong Beom; Jang, Jihyun; Kim, Jongjung; Kim, Ju Ye; Jung, Woo-Bin; Lee, Seunghee; Ryu, Ji Heon; Oh, Seung M.
- Issue Date
- Dec-2021
- Publisher
- PERGAMON-ELSEVIER SCIENCE LTD
- Keywords
- Lithium-ion battery; Titanium dioxide(TiO2); Anatase; Amorphous; Negative electrode; Capacity increase
- Citation
- ELECTROCHIMICA ACTA, v.398
- Journal Title
- ELECTROCHIMICA ACTA
- Volume
- 398
- URI
- https://scholarworks.bwise.kr/gachon/handle/2020.sw.gachon/87306
- DOI
- 10.1016/j.electacta.2021.139358
- ISSN
- 0013-4686
- Abstract
- Various studies are conducted with an aim to increase the capacity and reduce of the lithium diffu-sion resistance during the charge/discharge of titanium oxide (TiO2), which is used as anode material in lithium-ion batteries. However, it is difficult to overcome the limited storage capacity and high dif-fusion resistance because of the intrinsic crystalline features of TiO2. This study demonstrates that the lithium storage limit and high lithium diffusion resistance of crystalline titanium oxide (c-TiO2) can be overcome by using amorphous titanium oxide (a-TiO2). The results of X-ray diffraction, X-ray absorp-tion spectroscopy, and galvanostatic intermittent titration show that a-TiO2 can store more Li-ions and has a reduced lithium diffusion resistance than c-TiO2. In contrast, the lithium storage of the crystalline structure is limited and its lithium diffusion resistance is high. The better performance of a-TiO2 can be ascribed to anomalous amorphous lithium storage sites, which provide additional lithium storage and open lithium diffusion paths. (C) 2021 Elsevier Ltd. All rights reserved.
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