Glucose‐Derived Nitrogen‐Doped Porous Hard Carbon Modifying ZnS/SnS 2 Heterojunction for High‐Performance Sodium Storage
Zhongke Yang, Haiping Liu, Sifu Bi, Xiaoyu Chen, Kaiqi Zhang, Yu Zhang, Mingxu Liu, Kexin Wang, Xin Wang, Yixiao Guo, Xin SuABSTRACT
High‐capacity and long‐lifespan anode materials are essential to advance the practical deployment of sodium‐ion batteries (SIBs). Transition metal sulfides are promising anode candidates due to their high theoretical capacity, yet their practical applications are hindered by cycling‐induced volume expansion, inferior conductivity, and sodium polysulfide shuttling. This work constructs a novel composite material by embedding ZnS/SnS 2 heterojunctions into nitrogen‐doped porous glucose‐derived hard carbon (H‐ZSS/NC‐950P) to solve these drawbacks. Electrochemical tests confirm the optimized material delivers outstanding sodium storage performance. It retains a reversible capacity of 588.1 mAh·g −1 after 300 cycles at 1.0 A·g −1 , maintains 395.8 mAh·g −1 at an ultrahigh current of 50 A·g −1 , and achieves 68% capacity retention over 6000 cycles at 10 A·g −1 . Such superior performance stems from synergistic effects of the heterostructure. The ZnS/SnS 2 heterointerface builds an internal electric field to boost charge transfer. Nitrogen doping promotes surface pseudocapacitance. The porous carbon matrix accelerates ion diffusion, relieves volume strain, and anchors sodium polysulfides. Combined with CV and in situ XRD results, a conversion‐alloying sodium storage mechanism is verified. Full‐cell tests with a Na 3 V 2 (PO 4 ) 3 cathode further prove its practical feasibility. This research clarifies the storage mechanism of metal sulfide‐carbon heterostructures and offers a reliable strategy for high‐performance SIBs anode development.