期刊
ACS APPLIED MATERIALS & INTERFACES
卷 11, 期 32, 页码 28885-28893出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.9b07963
关键词
Na-layered oxide; solid permeable interface; carbonate-based electrolyte; ionic liquid electrolyte; Na-ion batteries
资金
- Basque Government [POS_2017_1_0006]
- Qatar National Research Fund (Qatar Foundation) [NPRP9-263-2-122]
- Helmholtz Association
The electrochemical properties of P2-Na2/3Mn0.8Fe0.1Ti0.1O2 layered oxide, which is a promising cathode material for rechargeable Na-ion batteries (NIBs), are evaluated with an optimized in-house ionic liquid (IL)-based electrolyte, and its performance is compared with that using carbonate-based electrolyte. The IL-based system reveals better electrochemical performance at room temperature than the carbonate electrolyte-based one at 0.1C and 1C, especially in terms of cycling stability, with a 97% capacity retention after 100 deep cycles (0.1C). The electrode/electrolyte interface is thoroughly studied in both systems by means of X-ray photoelectron spectroscopy and scanning electron microscopy so as proof that the formed interface is crucial to optimizing the electrochemical performance of NIBs. The carbonate-based system shows a thin, inhomogeneous, and unstable interface layer, while the IL-based one exhibits an even thinner but homogeneous and more stable interface, which may result in safer and longer-lasting NIBs.
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