Abstract
The formation and growth of Li-dendrites caused by inhomogeneous Li deposition severely hinder the commercial applications of Li metal batteries due to the consequence of short-circuiting. Herein, we propose a Janus bilayer composed of black phosphorus (BP) and graphene oxide (GO) as an artificial interface with chemical/mechanical stability and well-regulated Li-ion flux distribution for Li metal anode protection. Owing to the synergy between the fast Li-ion transport of BP in the inner layer and the high mechanical and chemical stability of GO in the outer layer, the GO/BP with good electrolyte wettability acts as a Li-ion regulator that can induce homogeneous growth of Li to suppress the Li dendrites growth. Accordingly, long-term stability (500 h at 1 mA cm−2) with a low overpotential of 30 mV is achieved in the symmetric cell with GO/BP-Li anode. Furthermore, the Li–S cell with GO/BP-Li exhibits enhanced cycling performance with a high capacity retention rate of 76.2% over 500 cycles at 1 C.
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