Ultra‐high Capacity and Stable Dual‐ion Batteries with Fast Kinetics Enabled by HOF Supermolecules Derived 3D Nitrogen‐Oxygen Co‐doped Nanocarbon Anodes

Abstract The low capacity, poor cycling life, and rapid self‐discharge hinder the development of carbonaceous dual‐ion batteries (DIBs). Conventional preparations of element doping amorphous carbons are cumbersome, complex, and difficult to control the doping element, content, and size. Here, a nitrogen‐oxygen co‐doped amorphous carbon nanomaterial (NDC) with unique 3D vortex‐layered amorphous structure and high doping content is ingeniously prepared via self‐assembly of hydrogen‐bonded organic framework precursors followed by one‐step pyrolysis, and then used for anodes of DIBs. By pairing with a commercial Nylon separator, a self‐supporting independent graphite cathode, and a high‐concentration electrolyte, the NDC‐based DIBs display an ultra‐high specific discharge capacity of up to 519 mAh g −1 at 1 C, low self‐discharge rate of 0.85% h −1 , capacity retention of 98.8% after 1500 cycles, and fast kinetic dynamics. This study offers a novel approach to enable carbonaceous nanomaterials for energy‐dense and long‐cycling DIBs.