Low-Tortuosity, hierarchical porous structure Co3O4@carbonized wood integrated electrode for lithium-ion battery

Abstract

Three-dimensional integrated electrode materials have broad application prospects in the field of improving the specific energy of lithium-ion batteries. Metal-organic frameworks and their derivatives are potential anode materials for Li-ion batteries due to their highly controllable composition and structure. Here, we designed and synthesized the Co3O4@carbonized wood (Co3O4@CW) composite as the anode materials of Li-ion batteries by ZIF-67 in situ growth in the balsa wood and high-Temperature carbonization. The composite keeps the low-Tortuosity and porous structure with a high specific surface area (293.61 m2/g), providing a smooth electrolyte transport path and enabling sufficient reaction sites for lithium-ions, thereby enhancing the electrochemical reactivity. The integrated electrode exhibits a specific capacity of 486.65 mAh/g and good stable performance (90.71% capacity maintain rate) after 200 cycles at the current of 0.2 A/g. The specific capacity reaches 552.37 mAh/g at 0.1 A/g and possessed excellent pseudocapacitive capacity (92.3%, the pseudocapacitive contribution).