3D pollen-scaffolded NiSe composite encapsulated by MOF-derived carbon shell as a high-low temperature anode for Na-ion storage

Construction and electrochemical mechanism investigation of hierarchical core—shell like composite as high performance anode for potassium ion batteries

“…The NiSe@NC retained more than 200 mA•h•g −1 after 400 cycles with 100% Coulombic efficiency, indicating the remarkable reversibility and stability of the NiSe@NC anode. Hierarchical core like structure NiSe@NC composite anode for sodium ion battery also shows one of the best electrochemical performances in case of rate performance and long cycling life compared to reported work [42][43][44].…”

“…Figure 5(a) shows the CV curves of initial five consecutive cycles in the voltage range 0.01-3 V at a scan rate of 0.1 mV•s −1 . In the first cycle, the sharp cathodic peak with high intensity was observed at 0.99 V with a minor peak at 0.44 V; however, during sodiation this main peak disappeared at later cycles, which might be attributed to the decomposition of electrolyte and SEI formation [42]. In the following anodic sweep, two anodic peaks at 1.78 and 1.91 V were observed, indicating the desodiation and the complete recovery of nickel selenide.…”

NiS1−xSex Nanoparticles Anchored on Nitrogen-Doped Reduced Graphene Oxide as Highly Stable Anode for Sodium-Ion Battery

“…In the first cathodic scan, in a voltage range of 0.01-3 V (Figure S5), an obvious peak can be seen located at 1.02 V, corresponding to the sodium ion insertion of NiS 1−x Se x @N-rGO (NiS 1−x Se x + γNa + + γe − ↔ Na γ NiS 1−x Se x , Na γ NiS 1−x Se x + (2 − γ)Na + + (2 − γ)e − ↔ Ni + (1 − x)Na 2 S + xNa 2 Se) and irreversible reaction associated with solid electrolyte interphase (SEI) formation [52][53][54]. In the first anodic scan, two broad peaks at 1.36 V, 1.79 V, and 2.25 V were associated with the oxidation reaction of Ni and the desodiation process [23,24,55,56]. The NiS 1−x Se x @N-rGO composites, in the range of 0.3-3 V (Figure 5a), showed similar curves, compared to that at voltage range of 0.01-3 V, but the CV curves shape in subsequent cycles presented a stronger tendency to overlapping, suggesting a more stable reaction in the NiS 1−x Se x @N-rGO electrode when the cut-off discharge voltage is 0.3 V [12].…”

Emergence of Ni‐Based Chalcogenides (S and Se) for Clean Energy Conversion and Storage

“…[ 86 ] In yet another work using a similar strategy, a synthesis procedure was reported where a multi‐step process was performed to obtain a hierarchical cole pollen‐scaffolded NiSe, encapsulated by MOF‐derived carbon shell, denoted as P‐NiSe@C. As‐prepared anode material, when used in SIBs, presented an initial discharge capacity of 784.9 mA h g −1 at 200 mA g −1 and maintained a capacity of 598.2 mA h g −1 after 100 cycles, which was considerably better than pristine NiSe. [ 87 ] Other composites such as WTe 2 quantum dots(QDs)‐doped NiSe/C, NiSe/Ni 2 P nanoparticles, NiSe x /C composites and NiO–NiSe were also reported. [ 85,88–91 ]…”