Facile and solvothermal synthesis of rationally designed mesoporous NiCoSe2 nanostructure and its improved lithium and sodium storage properties

Solid Solution Metal Chalcogenides for Sodium‐Ion Batteries: The Recent Advances as Anodes

“…Making a solid solution of metal chalcogenides is a frequently used strategy to compensate the drawbacks of monometallic anode materials. [ 57,58 ] The intrinsic properties of the solid solution can be hugely altered compared with the original parent material, while the crystal structure stays unchanged as the parent material remains single phase. As shown in Figure , substitution of the parent element with a guest element in a layered structural material (Figure 6A–C) might cause expansion of interlayer spacing, resulting in faster sodium ion kinetics; in 3D structured materials (Figure 6D–E), this could also change the interaction force between Na + and the active material, again giving rise to rapid Na + diffusion.…”

“…As examples, NiCo 2 S 4 and its corresponding selenides are frequently investigated in supercapacitor, electrocatalyst, and battery. [ 58,68–71 ] Nickel cobalt chalcogenides can show much higher conductivity than their counterpart oxides and monometallic chalcogenides, since the sulfide/selenide has lower band gap than the oxides and the multi metallic composition induces higher electronic conductivity. In addition, it should be mentioned that the ratio of these elements composing the chalcogenides could significantly affect the electrical conductivity as well as the sodium storage capacity.…”

“…Morphology and electrochemical performances of nickel cobalt chalcogenides. A–D) are SEM images of NiCo 2 Se 4, [ 57 ] NiCoSe 2, [ 58 ] NiCo 2 S 4, [ 74 ] and CoZnSe 2 [ 10 ] and I) TEM image of (NiCo)S 4 [ 73 ] . E–H,J) are cycling stability of corresponding chalcogenides.…”

“…Lee et al. prepared NiCoSe 2 with a mesoporous structure through solvothermal followed by a selenization step [ 58 ] . The optimal mesoporous structured active material depicts a capacity of 398 mAh g −1 at 50 mA g −1 after 60 cycles, and 85% retention was obtained.…”

Nanosilver‐Particles Integrated Ni3Sn2S2‐CoS Composite as an Advanced Electrode for High Energy Density Hybrid Cell

“…Of several methods, the hydro/solvothermal method is inexpensive, user-friendly, and also able to produce versatile nanostructures and a largescale yield of material. [17,18] In addition, exterminating the binders and conductive additives in the synthesis of electrode materials can diminish their electrical resistance as well as fabrication cost. [19] The hydro/solvothermal method is more expedient enough to synthesize the electrode materials directly on the target current collectors without the aid of binders/conductive additives.…”