3D ordered Mesoporous Si/C Sphere Arrays as High‐Volumetric‐Capacity and Durable Anode for Lithium‐ion Batteries
Qunyi Wang, Yaduo Jia, Yutai Wang, Puguang Ji, Chengwei Zhang, Huiyang Gou, Mirtemir Shodievich Kurbanov, Gongkai Wang
Abstract
Abstract Micro‐nanostructured Si/C composites are recognized as promising anode materials for high‐performance lithium‐ion batteries (LIBs), but such anodes often result in suboptimal volumetric capacities. Herein, a novel 3D ordered mesoporous Si/N‐doped carbon (Si/NC) sphere array (M‐Si/NC‐SA) as the anode material is introduced. The M‐Si/NC‐SA anode is designed to address these challenges by combining high compacted density and a mesoporous structure that provides efficient pathways for electrolyte and Li + diffusion, while also accommodating the volume expansion of silicon during cycling. The mesopores within the Si/NC spheres and macropores between the spheres act as buffer zones, preventing pulverization and minimizing particle‐level expansion. The optimal M‐Si/NC‐SA demonstrates outstanding electrochemical performance, delivering a high compacted density of 0.78 mg cm −3 , an impressive volumetric capacity of 2275 mAh cm −3 at 0.1 A g −1 , and a capacity of 1011 mAh g −1 at 1 A g −1 after 1000 cycles. The full‐cells paired with lithium iron phosphate cathode can achieve practically relevant attributes. This work provides a kilogram‐scale method for producing high‐performance Si‐based anodes with enhanced volumetric capacity and superior cycling stability, offering a promising approach for next‐generation LIBs.