Lithium metal anode has the highest energy density among all anode materials while dendrite growth hinders the direct use of lithium metal anode in batteries. Herein, ultrathin graphitic C3N4-poly(1,3-dioxolane) (CN-PDOL) composite interlayer is in-situ polymerized upon lithium metal anode. Flexible PDOL could separate Li anode and electrolyte, suppress the continuous breaking/generating of SEI layer and consumption of electrolyte, while g-C3N4 nanosheets could reduce the crystallinity of PDOL, increase ion-conductivity and uniform Li-ion flux. The synergistic effect of CN and PDOL could enable stable Li plating/stripping process over 850 h at a high current density of 3 mA cm-2 with a low overpotential of about 70 mV. This work demonstrates a promising strategy of functional buffer layer design for lithium metal anodes.

In-situ form graphitic C3N4-PDOL composite interlayer toward stable lithium metal anodes

ACS Spring Meeting 2021

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