A comparative study of increased lithium storage with low resistance at structural defects in amorphous titanium dioxide electrode. (1st December 2021)

• Record Type: Journal Article
• 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.
• Is Part Of: Electrochimica acta. Volume 398(2021)
• Publication Date: 2021-12-01
• Subjects: Lithium-ion battery -- Titanium dioxide (TiO2) -- Anatase -- Amorphous -- Negative electrode -- Capacity increase; Electrochemistry -- Periodicals; Electrochemistry, Industrial -- Periodicals; 541.37
• DOI: 10.1016/j.electacta.2021.139358
• Languages: English
• ISSNs: 0013-4686

Abstract

Highlights: Amorphous TiO2 is prepared using simple precipitation process. The electrochemical behavior of amorphous TiO2 is studied. Amorphous TiO2 can store more Li-ions and reduce lithium diffusion resistance. Abstract: Various studies are conducted with an aim to increase the capacity and reduce of the lithium diffusion 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 diffusion 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 absorption 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. Graphical abstract: Image, graphical abstract