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HighlightsUsing NiFe 2 O 4  quantum dots (QDs) as additive substitutes, the total carbon content in cathodes is sharply reduced from original ~ 26% (in traditional S/C cathodes) to a low mass ratio of ~ 5%.    The as-built S@CB ⊆ QDs demonstrate more appropriate tap density (~1.32 g cm −3 ) and specific surface area (~19.9 m 2  g −1 ) values than S@CB counterparts.    NiFe 2 O 4  QDs additives possess superb chemisorption interactions with Li 2 Sn molecules and proper charge-transfer/catalytic features to strengthen redox kinetics of overall cathode systems.Electronic supplementary material  The online version of this article (10.1007/s40820-020-00484-4) contains supplementary material, which is available to authorized users.

Curtailing Carbon Usage with Addition of Functionalized NiFe2O4 Quantum Dots: Toward More Practical S Cathodes for Li–S Cells