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

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

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.