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New Insight into the Atomic-Scale Bulk and Surface Structure Evolution of Li4Ti5O12 Anode.
- Source :
-
Journal of the American Chemical Society . 2/4/2015, Vol. 137 Issue 4, p1581-1586. 6p. - Publication Year :
- 2015
-
Abstract
- Identifying the structure of electrodes at atomic-scale remains a key challenge but is a fertile realm for groundbreaking fundamental research in the advanced Li-ion battery material field. In this context, the subtle structure evolution taking place during lithiation/delithiation in the bulk/surface of Li4Ti5O12 spinel (LTO) was probed using scanning transmission electron microscopy and found to undergo significant structure torque, namely Ti-- O bond stretching/shrinking at different state-of-charge (SOC), which is not identified previously. This kind of nanostructure change plays an important role in facilitating the formation of capturing centers for the electron/hole pairs in a 3.80 eV insulating material as is LTO. Furthermore, with the aid of electron energy loss spectroscopy, the spontaneous charge transfer process, Ti3+ ↔ e- + Ti4+, was confirmed in the fully lithiated Li7Ti5O12 surface as an essential step of the gas-releasing phenomenon. This new insight paves the way toward deeper comprehension and ultimately control of the electrochemical process for this and other important Li-ion battery materials. [ABSTRACT FROM AUTHOR]
- Subjects :
- *ELECTRODES
*LITHIUM ions
*MOLECULAR structure
*ELECTROCHEMICAL research
Subjects
Details
- Language :
- English
- ISSN :
- 00027863
- Volume :
- 137
- Issue :
- 4
- Database :
- Academic Search Index
- Journal :
- Journal of the American Chemical Society
- Publication Type :
- Academic Journal
- Accession number :
- 101076981
- Full Text :
- https://doi.org/10.1021/ja5115562