3D Carbon Networks: Design and Applications in Sodium Ion Batteries

Abstract As the key component of a new generation for low‐cost energy storage systems, sodium‐ion batteries (SIBs) have attracted enormous attention and research due to its promising potentiality in large‐scale electrochemical energy storage. For practical application of SIBs, carbonaceous materials have been considered to be one of the best choices for electrodes in virtue of their abundant reserves, low cost, easy availability, and environmental friendliness. 3D carbon network (3D‐carbon) is of particular interests, which has displayed outstanding features, including abundant active sites, interconnected multi‐level pore structures, high electronic conductivity, and excellent mechanical stability. Herein, we review the structural advantages of 3D‐carbon and its preparation methods, and then discuss recent progress in 3D carbon materials and their composites for SIBs. The superior functionalities of 3D‐carbon are emphasized as support templates or encapsulation shell membranes. Finally, we summarize and outline the challenges and future prospects of 3D‐carbon in SIBs.