Two-Dimensional Molecular Brush-Based Ultrahigh Edge-Nitrogen-Doped Carbon Nanosheets for Ultrafast Potassium-Ion Storage

Heteroatom doping, especially nitrogen has been regarded as an efficient strategy to break through the capacity limitation of carbonaceous anode materials in potassium-ion batteries (PIBs). Constructing edge-nitrogen-rich carbon skeleton with highly exposed active sites and charge transfer is critical for high performance nitrogen-doped materials. Herein, a kind ultrahigh edge-nitrogen (up 16.2 at%) doped nanosheets (ENCNS) developed by assembly high-nitrogen-ratio melamine (MA) polyacrylic acid grafted graphene oxide (GO-g-PAA) molecular brushes. The assembled PAA/MA structure facilitates formation during heat treatment, while conductive backbone 2D nanomorphology enables shortened ion diffusion pathways numerous surfaces. As result, ENCNS demonstrate excellent rate 144 mAh g−1 at 10 A g−1) good cycle stability (136 100 after 400 cycles 5 g−1, respectively).