期刊
JOURNAL OF POWER SOURCES
卷 294, 期 -, 页码 173-179出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2015.06.038
关键词
Li-ion batteries; LTO; PES; XPS; Surface layer; SEI
资金
- Swedish Energy Agency (STEM)
The presence of a surface layer on lithium titanate (Li4Ti6O12, LTO) anodes, which has been a topic of debate in scientific literature, is here investigated with tunable high surface sensitive synchrotron-based photoelectron spectroscopy (PES) to obtain a reliable depth profile of the interphase. Li vertical bar vertical bar LTO cells with electrolytes consisting of 1 M lithium hexafluorophosphate dissolved in ethylene carbonate:diethyl carbonate (LiPF6 in EC:DEC) were cycled in two different voltage windows of 1.0-2.0 V and 1.4-2.0 V. LTO electrodes were characterized after 5 and 100 cycles. Also the pristine electrode as such, and an electrode soaked in the electrolyte were analyzed by varying the photon energies enabling depth profiling of the outermost surface layer. The main components of the surface layer were found to be ethers, P-O containing compounds, and lithium fluoride. (C) 2015 Elsevier B.V. All rights reserved.
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