Increasing N active sites by in-situ growing conformal C3N4 layer in hierarchical porous carbon-based networks for fast Li+ transfer and polysulfide anchoring in lithium-sulfur batteries

Hierarchically porous CNT@NC@GCN membranes with high porosity of 85% are fabricated facilely, the 3D hierarchical porous network can provide broad reaction interface and active sites for LiPSs anchoring. Furthermore, the uniform GCN layer can significantly improve the metallicity and conductivity of the frameworks, and strengthen Li+ and electron transport. The abundant N in the GCN coating can enrich active sites in the membrane for adsorption and catalysis conversion of LiPSs and Li2S at a low energy barrier.