期刊
CHEMICAL ENGINEERING JOURNAL
卷 433, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2021.133792
关键词
Li-S Batteries; CoFe@NC Nanocubes; Modified Separator; Chemisorption; Catalytic Conversion
资金
- National Natural Science Foundation of China [21863006, 22008102]
- Science Founda-tion of Jiangxi Province [20192BAB216001, 20202ACB202004, 20212BBE53051]
- Key Laboratory of Jiangxi Province for Environment and Energy Catalysis [20181BCD40004]
The coordination mechanism of adjusting the chemical adsorption and catalytic conversion of polysulfides is crucial for the development of high energy density lithium-sulfur batteries. In this study, a CoFe@NC nanocubes material was successfully synthesized and used as a bifunctional separator modification for Li-S batteries. The CoFe@NC nanocubes exhibited strong chemisorption and catalytic conversion activity, leading to enhanced redox kinetics and reduced polysulfide shuttle effect. Li-S batteries assembled with CoFe@NC modified separator showed high specific capacity, excellent rate capacity, and superior cycle stability, even at high sulfur loading and low electrolyte conditions.
The coordination mechanism of adjusting the chemical adsorption and catalytic conversion of polysulfides plays a key role in the development of high energy density lithium-sulfur (Li-S) batteries. Herein, a CoFe alloy is locked in situ in nitrogen-doped carbon nanocube (denoted as CoFe@NC) as a bifunctional separator modification material for Li-S batteries. The obtained CoFe@NC nanocubes exhibit strong chemisorption and catalytic conversion activity of double polysulfides, leading to the enhanced redox kinetics and the reduced polysulfide shuttle effect for Li-S batteries. As expected, the batteries assembled with CoFe@NC modified separator (CoFe@NC//PP batteries) show high specific capacity and long cycle stability. Specifically, the CoFe@NC//PP batteries exhibit a high initial specific capacity of 1473 mA h g-1 at 0.1C, excellent rate capacity of 604 mA h g-1 at 4C, as well as superior cycle stability with the capacity decay rate of only 0.059% per cycle for 1000 cycles at 1C. Additionally, the satisfactory electrochemical performance can be achieved even in the case of high sulfur loading (6.60 mg cm-2) and low electrolyte (E/S is about 7 mu L mg -1). Therefore, this work provides a reliable reference to develop effective intermetallic compounds with chemical adsorption and catalytic conversion of polysulfides for high-performance lithium-sulfur batteries.
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