Stabilizing lithium metal anodes with solid electrolyte interphase by embedding two-dimensional C3N4/Graphyne as protective layers

Abstract

The diffusions of lithium ions and sulfide ions between lithium anodes and solid electrolyte interphase have been systematically investigated with both monolayer C3N4 and bilayer C3N4 embedded as protective layers. It is found that, pristine C3N4 would absorb lithium ions inside the C3N4 pores, and such Li-C3N4 could serve as feasible protective layers by providing suitable pathway for lithium ions with small energy barrier while preventing sulfur ions to diffuse with a much larger energy barrier. Heterostructures of C3N4/Graphyne are constructed to demonstrate that 2D materials with suitable pore size are effective to be protective layers for lithium metal anode.