One‐Step Carbonization Tailored Functional Groups and Micropores toward Fast and Durable Na‐Ion Storage in Hard Carbon

to synthesize hard carbon anodes with micropores and functional groups, enhancing pseudocapacitive sodium storage. The micropores with a high specific surface area significantly shorten the diffusion path of sodium ions, while the carbon skeleton, with its abundant surface-active sites, enables the rapid absorption and desorption of sodium ions. By providing abundant and reversible Na⁺ adsorption sites and effectively mitigating volume expansion, the anode demonstrates excellent rate performance (100 mAh g⁻¹ at 20 A g⁻¹) and outstanding cycling stability (138.4% capacity retention after 3500 cycles). These features contribute to its exceptional overall performance, providing a cost-effective solution for durable and high-performance sodium-ion battery anodes.