Toward Extremely Fast Charging through Boosting Intercalative Redox Pseudocapacitance: A SbCrSe₃ Anode for Large and Fast Sodium Storage

Abstract

Alloying‐type metals with high theoretical capacity are promising anode materials for sodium ion batteries, but suffer from large volume expansion and sluggish reaction kinetics. Dispersing alloying‐type metal into a buffer matrix with interfacial anionic covalent bonding is an effective method to solve the above issues. Here, this bifunctional structural unit is designed by incorporating high‐capacity Sb metal into a rigid CrSe framework for fast‐charging applications. The high‐capacity and high‐rate sodium storage can be synergistically realized in the bifunctional SbCrSe system, where the rigid CrSe framework endows the SbCrSe3 anodes with superior structural stability and improved intercalative redox pseudocapacitance. Moreover, the volume expansion of Sb during discharge can be buffered by the CrSe chain‐like matrix. The novel SbCrSe3 anode delivers a high charge capacity of 472 mAh g−1 at a current density of 0.4 C and retains ≈100% capacity at 60 C over 10 000 cycles. Further in situ and ex situ characterization reveal the multistep reaction mechanism, and the breakage and formation of reversible SbSe bonds during (dis)charge. The proposed bifunctional structural unit that combines alloying type anodes and intercalative anodes is expected to pave a new road for the development of high capacity and high rate anode materials.

Quasi‐Topological Intercalation Mechanism of Bi0.67NbS2 Enabling 100 C Fast‐Charging for Sodium‐Ion Batteries

“…The b ‐values of the labeled peak 1 and peak 2 were calculated to be 0.65 and 0.89, respectively (Figure 4g), suggesting a predominant capacitive characteristic of Bi 0.67 NbS 2 , which is associated with the surface redox activity of intercalation host framework. [ 8,44 ]…”

Defect engineering of two-dimensional materials for advanced energy conversion and storage

“…Compared with LIBs, the electrode development of SIBs is more challenging. 394,395 And the defective 2D materials have great potential of being used as electrodes for SIBs. Jin et al prepared the N, B co-doped carbon nanosheets (NBTs) using biomass-based gelatin and boric acid as the carbon precursor and the template, respectively.…”

Intercalative Motifs‐Induced Space Confinement and Bonding Covalency Enhancement Enable Ultrafast and Large Sodium Storage

“…Given substantial developments in high‐performance SIB cathodes with kinetically favorable Na + storage channels, [ 7–9 ] the simultaneous exploration of advanced anodes to confer high capacities and rate capabilities is crucial to enabling the widespread application of SIBs. [ 10–17 ] Among various anode candidates, bismuth sulfide (Bi 2 S 3 ) with a unique layered structure has attracted considerable attention due to the high theoretical gravimetric capacity (625 mAh g −1 ), high volumetric capacity (4250 mAh cm −3 ), and low cost. [ 18–21 ] Nevertheless, the advantages are overshadowed by the inferior cycling and rate performance due to the continuous aggregation and pulverization of Bi caused by the large volume expansion (≈244%) during sodiation process.…”