Synthesis of multicore-shell FeS2@C nanocapsules for stable potassium-ion batteries

Anchoring polysulfides via a CoS2/NC@1T MoS2 modified separator for high-performance lithium–sulfur batteries

“…S11, † the peak is divided into C-C/CvC (284.8 eV), C-O/C-N (286.2 eV), and O-CvO bonds (288 eV), respectively. 46 To adsorb the easily soluble polysulfides during charging and discharging, we coated CoS 2 /NC@1T MoS 2 on the positive-facing side to form a modified functionalized separator (Fig. 4).…”

Carbon Quantum Dot-Coated VSe2 Nanosheets as Anodes for High-Performance Potassium-Ion Batteries

“…Lithium-ion batteries (LIBs) have been extensively used in electronic equipment, electric vehicles, and hybrid electric vehicles due to their high energy density, environmental protection, and long cycling life. − Sodium-ion batteries (SIBs) and potassium-ion batteries (PIBs) have attracted great attention in recent years thanks to their abundant natural storage (2.36 and 2.09% for sodium and potassium, respectively, compared to 0.0017% for lithium in weight in the Earth’s crust). − PIBs have a lower redox voltage (−2.93 K + /K vs E 0 ) compared to that of SIBs (−2.71 Na + /Na vs E 0 ) and a higher operating voltage and energy density. − Besides, with the weaker Lewis acidity of K + , the smallest solvated K + , and Stokes’ radius (0.36, 0.46, and 0.48 nm for K + , Na + , and Li + , respectively), K + has faster diffusion in the electrolyte, thus improving the electrode kinetic. , Unfortunately, the large radius of K + results in the poor kinetic and unstable structure during the depotassiation/potassiation process, leading to low capacity and inferior cycling life. − To date, the investigation of PIB electrode materials is also less. On the one hand, the anode materials focus on carbon, graphene, and transition-metal composites. − On the other hand, the cathode materials concentrated in Prussian blue and phosphate. , …”

Constructing FePSe3–FeSe2 heterojunctions uniformly in a Ketjen black carbon matrix for superior potassium ion batteries

“…15,16 Manufacturing nanostructural TMDs with a carbon framework is an effective way to improve their potassium storage performance. For example, ultrasmall CoS 2 nanoparticles integrated into hierarchical porous carbon nanobers, 17 FeS 2 nanoparticles encapsulated in a hollow carbon shell, 18 and ultrane SnS nanoparticles in hollow multichannel carbon nanobers 19 are all promising anode materials for PIBs.…”