Achieving high energy density and fast charging of lithium-ion batteries can accelerate the promotion of electric vehicles. However, the increased mass loading causes poor charge transfer, impedes the electrochemical reaction kinetics, and limits the battery charging rate. Herein, this work demonstrated a novel pattern integrated stamping process for creating channels in the electrode, which benefits ion transport and increases the rate performance of the electrode. Meanwhile, the pressure applied during the stamping process improved the contact between electrode and current collector and also enhanced the mechanical stability of the electrode. Compared to the conventional bar-coated electrode with the same thickness of 155 μm (delivered a discharge capacity of 16 mAh g⁻¹ at the rate of 3 C), the stamped low-tortuosity LiFePO₄ electrode delivered 101 mAh g⁻¹ capacity. Additionally, water was employed as a solvent in this study. Owing to its eco-friendliness, high scalability, and minimal waste generation, this novel stamping technique inspire a new method for the industrial-level efficient roll to roll fabrication of fast-charge electrodes.

Porous carbon materials are widely used in particulate forms for energy applications such as fuel cells, batteries, and (super) capacitors. To better hold the particles together, polymeric additives are utilized as binders, which not only increase the weight and volume of the devices, but also cause adverse side effects. We developed a wood-derived, free-standing porous carbon electrode and successfully applied it as a cathode in Li-O₂ batteries. The spontaneously formed hierarchical porous structure exhibits good performance in facilitating the mass transport and hosting the discharge products of Li₂O₂. Heteroatom (N) doping further improves the catalytic activity of the carbon cathode with lower overpotential and higher capacity. Overall, the Li-O₂ battery based on the new carbon cathode affords a stable energy efficiency of 65% and can be operated for 20 cycles at a discharge depth of 70%. The wood-derived free-standing carbon represents a new, unique structure for energy applications.