Ultraconcentrated Sodium Bis(fluorosulfonyl)imide-Based Electrolytes for High-Performance Sodium Metal Batteries.

Citation data:

ACS applied materials & interfaces, ISSN: 1944-8252, Vol: 9, Issue: 4, Page: 3723-3732

Publication Year:
2017
Usage 2
Abstract Views 2
Captures 43
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Citations 22
Citation Indexes 22
Repository URL:
http://scholarworks.unist.ac.kr/handle/201301/21402
PMID:
28067499
DOI:
10.1021/acsami.6b14878
Author(s):
Lee, Jaegi; Lee, Yongwon; Lee, Jeongmin; Lee, Sang-Min; Choi, Jeong-Hee; Kim, Hyungsub; Kwon, Mi-Sook; Kang, Kisuk; Lee, Kyu Tae; Choi, Nam-Soon
Publisher(s):
American Chemical Society (ACS); AMER CHEMICAL SOC
Tags:
Materials Science; high-voltage cathodes; interfaces; liquid electrolytes; sodium bis(fluorosulfonyl)imide; sodium metal batteries
article description
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 NaFe(PO)(PO) and Na(FeMn)O cathodes charged to high voltages (>4.2 V versus Na/Na), resulting in outstanding cycling stability (high reversible capacity of 109 mAh g over 300 cycles for the Na/NaFe(PO)(PO) cell) compared with the conventional dilute electrolyte, 1 M NaPF in ethylene carbonate/propylene carbonate (5/5, v/v).