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

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.