期刊
CHEMICAL ENGINEERING JOURNAL
卷 430, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2021.132750
关键词
Na+-solvent co-intercalation; Layered structure regulation; Hydrogen titanates; Charge transfer kinetics; Low-temperature sodium-ion batteries
资金
- National Natural Science Foundation of China [21673064, 51902072, 22109033]
- Heilongjiang Touyan Team [HITTY-20190033]
- Fundamental Research Funds for the Central Universities [HIT. NSRIF. 2019040, 2019041]
- State Key Laboratory of Urban Water Resource and Environment (Harbin Institute of Technology) [2020 DX11]
- [LBH-Z19055]
The strategy of triggering Na+-solvent co-intercalation can accelerate charge transfer kinetics and improve the performance of sodium-ion batteries at low temperatures. By regulating the layer structure with oxygen defects, hydrogen titanate nanowires exhibit unique behavior at -25 degrees C, delivering high capacity and cycle stability.
Due to the sluggish interfacial kinetics, the energy density and cycle life of sodium-ion batteries (SIBs) suffer severely at subzero temperatures. Herein, to accelerate the interfacial charge transfer process and improve the low-temperature SIBs performance, a strategy by triggering Na+-solvent co-intercalation is proposed. Using hydrogen titanate nanowires (HT-NW) as a model, we found that the layer structure regulation with oxygen defects could trigger HT-NW presents a unique Na+-solvent co-intercalation behavior in the ether-based electrolyte at -25 degrees C according to ex-situ FTIR and XRD. By eliminating the Na+ desolvation process, Na+-solvent co-intercalation could effectively accelerate the Na+ diffusion kinetics and reduce the activation energy to 66.0 meV. Benefit from these ameliorations, the defective HT-NW delivers a high capacity of 238 mAh g(-1) at -25 degrees C, which is equivalent to 89% of that at 25 degrees C. Besides, the defective HT-NW shows great superiority in cycle stability, maintaining capacity retention of 80.6% after 4200 cycles at 1.0 A g(-1) at -25 degrees C. Moreover, at -25 degrees C, the defective HT-NW//Na3V2(PO4)(3) full cell exhibits high energy density (119.1 Wh kg(-1)) and outstanding stability (94.5% after 1000 cycles at 1.0C). These findings reveal that the ion-solvent co-intercalation is highly feasible to improve the battery performance at low temperatures by accelerating charge transfer kinetics.
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