Highly reversible Na ion storage in N-doped polyhedral carbon-coated transition-metal chalcogenides by optimizing the nanostructure and surface engineering

Abstract

Polyhedral carbon-coated structural N-CoS2@C nanoparticles are synthesized by a facile one-pot solvothermal technique and exhibit excellent sodium ion storage performance.

Double Morphology of Co9S8 Coated by N, S Co-doped Carbon as Efficient Anode Materials for Sodium-Ion Batteries

“…5a. Varying from common ionic diffusion, the peak current (I, mA) is not completely linearly dependent to v 1/2 (v is the scan rate, mV s −1 ), indicating the coexistence of non-faradic and faradic behaviors [35,50]. And the results can be verified by the relation between log(I) and log(v), according to equation of log(I) = b log(v) + log(a).…”

Synthesis of Copper‐Substituted CoS2@CuxS Double‐Shelled Nanoboxes by Sequential Ion Exchange for Efficient Sodium Storage

“…The broad peak at 0.8 V is assigned to the phase transformation of Na x CuS, the formation of a solid electrolyte interphase (SEI) film, and the conversion reaction of Na x CoS 2 into Co and Na 2 S . In the subsequent cathodic scans, the main reduction peaks shifted to 1.88 and 1.55 V, which are attributed to the intercalation of Na + ions into CuS x and CoS x , respectively . In the anodic scans, two peaks at about 1.86 and 2.06 V are ascribed to the reverse conversion reaction of Na 2 S and Co into CoS x , while the peak at 2.16 V is assigned to the extraction of Na + ions from the Na x CuS structure .…”

Recent Advances in Aerosol‐Assisted Spray Processes for the Design and Fabrication of Nanostructured Metal Chalcogenides for Sodium‐Ion Batteries

“…Full reduction of MX to form M during the sodiation process leads to a higher capacity . Recently, metal chalcogenide materials, in particular sulfides and selenides, have attracted increasing attention as promising anode materials for SIBs . Metal chalcogenides have increased bond lengths and correspondingly weaker binding energy, which reduces the energy consumption of the sodiation/desodiation reaction .…”

“…[23] Recently,m etal chalcogenide materials, in particularsulfidesa nd selenides,have attracted increasing attention as promising anode materials for SIBs. [24][25][26][27][28][29][30][31][32] Metal chalcogenides have increased bond lengths and correspondingly weaker binding energy,w hich reduces the energy consumption of the sodiation/desodiationr eaction. [23][24][25][26] Furthermore, their discharge products (Na 2 Sa nd Na 2 Se for sulfidesa nd selenides, respectively) afford better Na + conductivity andl ower formation enthalpies than Na 2 O.…”