Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 9, Issue 44, Pages 38950-38958Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.7b10306
Keywords
lithium sulfur battery; lithium anode; lithium protection; crown ether; Li-crown ether coordination
Funding
- National Key Research and Development Project [2016YFB0100400]
- Natural Science Foundation of China [21273168, 21233004]
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Lithium-sulfur (Li-S) battery is an important candidate for next-generation energy storage. However, the reaction between polysulfide and lithium (Li) anode brings poor cycling stability, low,Coulombic efficiency, and Li corrosion. Herein, we report a Li protection technology. Li metal was treated in crown ether containing electrolyte, and thus, treated Li was further used as the anode in Li-S cell. Due to the coordination between Li+ and crown ether, a Li+-permeable film can be formed on Li, and the film is proved to be able to block the detrimental reaction between Li anode and polysulfide. By using the Li anode pretreated in 2 wt % B15C5-containing electrolyte, Li-S cell exhibits significantly improved cycling stability, such as similar to 900 mAh g(-1) after 100 cycles, and high Coulombic efficiency of >93%. In addition, such effect is also notable when high S loading condition is applied.
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