期刊
ACS APPLIED MATERIALS & INTERFACES
卷 9, 期 4, 页码 3723-3732出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.6b14878
关键词
sodium metal batteries; liquid electrolytes; sodium bis(fluorosulfonyl)imide; interfaces; high-voltage cathodes
资金
- National Research Foundation of Korea (NRF) grant - Korea government (MSIP) [2016R1A2B4015561]
- Korea Electrotechnology Research Institute (KERI) primary research program through the National Research Council of Science AMP
- Technology (NST) - Ministry of Science, ICT and Future Planning (MSIP) [16-12-N0101-20]
- Research Fund of UNIST (Ulsan National Institute of Science and Technology) [1.160004.01]
- Korea Evaluation Institute of Industrial Technology (KEIT) [16-12-N0101-20] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Foundation of Korea [2016R1A2B4015561] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
We present an ultraconcentrated electrolyte composed of 5 M sodium bis(fluorosulfonyl)imide in 1,2-dimethoxyethane for Na metal anodes coupled with high-voltage cathodes. Using this electrolyte, a very high Coulombic efficiency of 99.3% at the 120th cycle for Na plating/stripping is obtained in Na/stainless steel (SS) cells with highly reduced corrosivity toward Na metal and high oxidation durability (over 4.9 V versus Na/Na+) without corrosion of the aluminum cathode current collector. Importantly, the use of this ultraconcentrated electrolyte results in substantially improved rate capability in Na/SS cells and excellent cycling performance in Na/Na symmetric cells without the increase of polarization. Moreover, this ultraconcentrated electrolyte exhibits good compatibility with high-voltage Na4Fe3(PO4)(2)(P2O7) and Na-0.7(Fe0.5Mn0.5)O-2 cathodes charged to high voltages (>4.2 V versus Na/Na+), resulting in outstanding cycling stability (high reversible capacity of 109 mAh g(-1) over 300 cycles for the Na/Na4Fe3(PO4)(2)(P2O7) cell) compared with the conventional dilute electrolyte, 1 M NaPF6 in ethylene carbonate/propylene carbonate (5/5, v/v).
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