Designing Rational Interfacial Bonds for Hierarchical Mineral‐Type Trogtalite with Double Carbon towards Ultra‐Fast Sodium‐Ions Storage Properties

Abstract Engineering advanced sodium‐ion storage materials with considerable kinetic behaviors have triggered a series of active explorations. However they still suffer from interfacial gaps and uncompleted redox reactions, bringing about poor rate abilities. Herein, through the strategy of salt‐fixed and thermochemical manners, the CoSe 2 /OC with interfacial chemical CoOC bonds are successfully prepared, displaying the reduced particles and optimized structural features. Meanwhile, from the analysis of long‐term phase changing curves and ex‐situ technologies, the CoSe 2 would be decomposed into CoSe and Se phases but captured by the synergistic effect of their physical‐chemical evolutions, while the structure and new‐type are stabilized after cycling. Profiting from the “bridge” roles of bonds, the electrons are effectively accelerated with the deepening redox reactions. As expected, based on these advantages, the ultra‐fast abilities are reached about 346 mAh g −1 at 15.0 A g −1 after 3500 cycles, and their capacity of full‐cells are also kept at about 326 mAh g −1 (cathodes Na 3 V 2 (PO 4 ) 3 @C vs anodes CoSe 2 /OC). The detailed analysis of kinetic behaviors strongly demonstrated that the increased interfacial charge storage and conductivities are crucial for promoting the ions‐storage abilities. Given this, the rational work is anticipated to provide significant strategies for advanced energy‐storage materials.