期刊
ADVANCED ENERGY MATERIALS
卷 10, 期 6, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.201903448
关键词
anodization; pre-lithiation; sodium ion batteries; solid electrolyte interphases; TiO2 nanotubes
类别
资金
- ERC
- Erlangen DFG cluster of excellence EAM [EXC 315]
- DFG funCOS
- DFG
Recently, sodium ion batteries (SIBs) have been widely investigated as one of the most promising candidates for replacing lithium ion batteries (LIBs). For SIBs or LIBs, designing a stable and uniform solid electrolyte interphase (SEI) at the electrode-electrolyte interface is the key factor to provide high capacity, long-term cycling, and high-rate performance. In this paper, it is described how a remarkably enhanced SEI layer can be obtained on TiO2 nanotube (TiO2 NTs) arrays that allows for a strongly improved performance of sodium battery systems. Key is that a Li+ pre-insertion in TiO2 NTs can condition the SEI for Na+ replacement. SIBs constructed with Li-pre-inserted NTs deliver an exceptional Na+ cycling stability (e.g., 99.9 +/- 0.1% capacity retention during 250 cycles at a current rate of 50 mA g(-1)) and an excellent rate capability (e.g., 132 mA h g(-1) at a current rate of 1 A g(-1)). The key factor in this outstanding performance is that Li-pre-insertion into TiO2 NTs leads not only to an enhanced electronic conductivity in the tubes, but also expands the anatase lattice for facilitated subsequent Na+ cycling.
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