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 CoSe2/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 CoSe2 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 Na3V2(PO4)3@C vs anodes CoSe2/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.

Rational Design of Yolk–Shell ZnCoSe@N‐Doped Dual Carbon Architectures as Long‐Life and High‐Rate Anodes for Half/Full Na‐Ion Batteries

“…Besides, the reaction peak potentials display a slight shift with an increase of sweep rate, which is attributed to the widely reported polarization phenomenon. [ 47 ] The total charge storage of the electrode is contributed by both pseudocapacitive process and diffusion‐controlled behavior. The power‐law relationship between peak currents ( i ) and sweep speed ( v ) can be applied to determine the portion of the capacitive contribution [ 48 ] where a and b express adjustable parameters derived from the data fitting.…”

Engineering hierarchical Sb2S3/N–C from natural minerals with stable phase-change towards all-climate energy storage

“…Based on previous reports, the characteristic frequency f at a phase angle of À45 was applied to evaluate the internal resistance of capacitive behaviors, where the condign time constant s(1/f) of SS-NC was 0.82 s, much lower than that of SS-SO (5.62 s) and SS-OM (10.00 s), illustrating that the restructuring of the lattice and N-doped carbon-matrix coating were benecial for the enhancement of ion diffusion. [78][79][80][81] Moreover, their real capacitance (C 0 ) and imaginary capacitance (C 00 ) versus frequency (f) at the 50 th cycle were observed (Fig. 6g and h).…”

Sodium‐Ion Capacitors: Recent Development in Electrode Materials

“…the b value approaching 1.0 indicates a capacitive dominated electrochemical process, while a value of 0.5 suggests a typical Faradaic reaction‐controlled electrochemical process [53–55] . After plotting log( i ) versus log( v ), the corresponding slope is the value of b .…”

“…After plotting log( i ) versus log( v ), the corresponding slope is the value of b . Based on previous studies, [54,55] the current response at a fixed potential can be separated into capacitive controlled part and Faradaic reaction dominated part, and the relationship between them can be described as follows [Eq. 6] …”