期刊
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
卷 137, 期 4, 页码 1581-1586出版社
AMER CHEMICAL SOC
DOI: 10.1021/ja5115562
关键词
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资金
- 973 Projects [2010CB833102, 2012CB932900]
- NSFC [51222210, 11234013, 11174334]
- State Grid Corporation of China Li4Ti5O12 based stationary battery and system Project, Strategic Priority Research Program of the Chinese Academy of Sciences [XDA01020304]
- One Hundred Talent Project of the Chinese Academy of Sciences
- Natural Sciences & Engineering Research Council of Canada (NSERC)
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.
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