摘要
Here,a facile strategy is proposed for the preparation of lithiated graphdiyne quantum dots(GDY-Li QDs)with conjugated sp-and sp2-hybridized carbons by the self-assembly technique ofπ–πstacking of lithiated hexaethynylbezene under mild conditions.The as-prepared GDY-Li QDs,containing stacked multialkynyl aromatic backbone and abundant lithium(Li),show an average diameter of about 2.6 nm and good dispersion in the solvents.These distinctive structures endow GDY-Li QDs with superior properties that cannot be matched by traditional QDs,such as strong ion adsorption,Li-ion self-concentration,high Li-ion conductivity,the nanoconfinement effect,and ion solvation regulation.Benefiting from these features,GDY-Li QDs can stabilize Limetal anodes to effectively suppress Li-dendrite growth and significantly improve its Li plating/stripping coulombic efficiency(99.3%in the carbonate electrolyte).The full cells with GDY-Li QDs protected Li-metal anodes,and LiNi_(0.8)Co_(0.1)Mn^(0.1)O_(2)cathodes delivered high capacity and excellent cycling stability at high rates,which demonstrates the great potential of GDY-Li QDs for application in fast-charging Li-metal batteries.
基金
supported by the National Key Research and Development Project of China(grant nos.2022YFA1204500 and 2022YFA1204503)
the National Natural Science Foundation of China(grant nos.52072222 and 22279073)
the Natural Science Foundation of Shandong Province(grant no.ZR2022ZD35)
the Taishan Scholar Project of Shandong Province of China(grant no.62460082061017).
