Interfacial Bonding of Metal‐Sulfides with Double Carbon for Improving Reversibility of Advanced Alkali‐Ion Batteries

Abstract

Engineering interfacial properties of metal-sulfides toward excellent electrochemical capability is imperative for advanced energy-storage materials. However, they still suffer from an unclear mechanism of capacity fading, along with ineffective physical-chemical evolution. Herein, a highly-effective Sb 2 S 3 with double carbon is designed with interfacial SbC bonds and double carbon, which boosts promoting of ion transferring and alleviates the separation of both active phases (Sb, S). Through "voltage-cutting" manners, the key elements of capacity improvement about phase transitions are further determined. As expected, even at 5.0 A g −1 , the lithium-storage capacity remains about 674 mAh g −1 . Utilized as sodium ion battery (SIB) anode, the rate capacity still reaches up to 366 mAh g −1 at 3.0 A g −1 , much larger than that of Sb 2 S 3 . Obtaining the full cell of Ni-Fe Prussian blue analog versus M-Sb 2 S 3 @DC, the reversible capacity is 330 mAh g −1 at 0.5 A g −1 . Supported by kinetic analysis, the excellent rate properties are determined by the surface-controlling behaviors, mainly resulting from the decreased capacitive resistance and improved ion moving. Furthermore, the reassembling evolution of active phases is revealed in detail by ex situ techniques. This work is expected to offer significant insights into interfacial evolutions toward advanced energy-storage systems.

Heterogeneous Interface Design for Enhanced Sodium Storage: Sb Quantum Dots Confined by Functional Carbon

“…Additionally, the peaks located at 1620.4, 1389.5, and 1101.2 cm −1 correspond to CC, CO, and COC, respectively. The distinct vibrational peak at around 744.9 cm −1 is attributed to the symmetric stretching of Sb 2 O 3 , [20] which is consistent with the XRD and XPS results. As shown in Raman spectra (Figure 4e), two peaks appeared at 106.4 and 145.1 cm −1 are identified as the E g and A 1g bands of Sb, respectively.…”

“…[ 18,19 ] Also, the interfacial coupling interaction brings about a boosted ion‐diffusion kinetic and thermal stability, with the introduction of SbOC bonding. [ 20 ] The Sb quantum dots are uniformly confined in well‐conductive elastic carbon network with little aggregation, which reinforces the structural integrity. [ 9,21 ] These two phases were mixed and evenly distributed spontaneously with numerous phase boundaries and heterointerfaces, which markedly facilitate the ion‐storage performance, and optimize the SEI layer.…”

Urchin‐Type Architecture Assembled by Cobalt Phosphide Nanorods Encapsulated in Graphene Framework as an Advanced Anode for Alkali Metal Ion Batteries

“…For the preparation of hybrid electrodes in rechargeable alkali metal ion battery systems, the traditional processes involve coating slurry consisting of an active material, a conductive reagent, and a binder onto a metal current collector [20–22] . The used binders are electrochemical inactive materials.…”

Flexible polytriphenylamine-based cathodes with reinforced energy-storage capacity for high-performance sodium-ion batteries

“…In Fig. S8a and b, with the increasing of scan rate, the response current becomes higher, reflecting that the increased redox reactions bring about more electrons shuttling in the external circuit [40]. According to their corresponding CV curves at different scan rates (v), the linear fitting of peak current (i p, from Peak-1 and Peak-2) vs. v 1/2 are obtained (Fig.…”