Journal
NANO-MICRO LETTERS
Volume 12, Issue 1, Pages -Publisher
SHANGHAI JIAO TONG UNIV PRESS
DOI: 10.1007/s40820-020-00484-4
Keywords
Carbon usage reduction; NiFe2O4 quantum dots; Additive substitute; Practical S cathode; Li-S cells
Funding
- National Natural Science Foundation of China [51802269, 21773138]
- Chongqing Natural Science Foundation [cstc2018jcyjAX0624]
- Fundamental Research Funds for the Central Universities [XDJK2019AA002]
- Venture & Innovation Support Program for Chongqing overseas returnees [cx2018027]
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Smart combination of manifold carbonaceous materials with admirable functionalities (like full of pores/functional groups, high specific surface area) is still a mainstream/preferential way to address knotty issues of polysulfides dissolution/shuttling and poor electrical conductivity for S-based cathodes. However, extensive use of conductive carbon fillers in cell designs/technology would induce electrolytic overconsumption and thereby shelve high-energy-density promise of Li-S cells. To cut down carbon usage, we propose the incorporation of multi-functionalized NiFe2O4 quantum dots (QDs) as affordable additive substitutes. The total carbon content can be greatly curtailed from 26% (in traditional S/C cathodes) to a low/commercial mass ratio (similar to 5%). Particularly, note that NiFe2O4 QDs additives own superb chemisorption interactions with soluble Li2Sn, molecules and proper catalytic features facilitating polysulfide phase conversions and can also strengthen charge-transfer capability/redox kinetics of overall cathode systems. Benefiting from these intrinsic properties, such hybrid cathodes demonstrate prominent rate behaviors (decent capacity retention with - 526 mAh g(-1) even at 5 A g(-1)) and stable cyclic performance in LiNO3-free electrolytes (only 0.08% capacity decay per cycle in 500 cycles at 0.2 A g(-1)). This work may arouse tremendous research interest in seeking other alternative QDs and offer an economical/more applicable methodology to construct low-carbon-content electrodes for practical usage.
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