Zn–O–C bonds for efficient electron/ion bridging in ZnSe/C composites boosting the sodium-ion storage

Abstract

Metal-selenides are one of the next generation anode materials for sodium ion batteries (SIBs), but suffer from sluggish charge/ion transport, huge volume expansion and aggregation of particles. Herein, ZnSe/C composites...

Constructing a VS4–V2CTx heterojunction interface to realize an ultra-long lifetime and high rate capability in sodium-ion batteries

“…The electron accumulation and dissipation are located at the phase boundary of VS 4 -V 2 CT x , which verifies charge rearrangement. 77,78 During the charging/discharging process, a stable transport path is formed at the phase interface of charge and Na + by a built-in electric field, which accelerates the electrochemical reaction kinetics of Na + in VS 4 . Based on the above discussion, such VS 4 -V 2 CT x Schottky contact heterojunctions will induce a built-in electric field at the hetero-geneous surface which will significantly accelerate the kinetics of charge transfer and lead to high-rate capability.…”

Metal Selenides Find Plenty of Space in Architecting Advanced Sodium/Potassium Ion Batteries

“…Electrochemically, the as-prepared ZnSe/C anode exhibited an excellent rate performance of 281.1 mAh g −1 at 5 A g −1 and retained 434 mAh g −1 after 500 cycles at 0.5 A g −1 . [141] As for PIBs, the reaction mechanism of ZnSe is similar to that of SIBs. However, it also suffers from poor cyclability and low electronic conductivity.…”

“…Electrochemically, the as‐prepared ZnSe/C anode exhibited an excellent rate performance of 281.1 mAh g −1 at 5 A g −1 and retained 434 mAh g −1 after 500 cycles at 0.5 A g −1 . [ 141 ]…”

Research progress on ZnSe and ZnTe anodes for rechargeable batteries

“…In addition, worth noting is that covalent Zn-O-C bonds could be formed to crosslink the ZnSe active material and carbon matrix and are serving as an electron/ion bridge, which further brings about the enhancement of charge/ion transport and electrochemical reaction kinetics as well as the improved polyselenide capture ability and structural stability. 113 It is noteworthy that ZnSe and its composites as SIB anode materials usually exhibit a diffusion-controlled process (i.e., battery behavior) rather than surface-controlled process (capacitor behavior), 42,75 which is different from that as LIB anode materials; one exception is that the ultrafine ZnSe nanoparticles may show an enhanced pseudocapacitive contribution. 34,41 Lu et al rationally designed a robust hybrid hollow structure with ultrafine ZnSe nanoparticles simultaneously grown on the inner and outer surfaces of amorphous hollow carbon nanospheres (ZnSe@HCNs) via a facile hydrothermal process with the assistance of polymer hollow templates followed by calcination (Fig.…”

“…In addition, worth noting is that covalent Zn–O–C bonds could be formed to crosslink the ZnSe active material and carbon matrix and are serving as an electron/ion bridge, which further brings about the enhancement of charge/ion transport and electrochemical reaction kinetics as well as the improved polyselenide capture ability and structural stability. 113…”