Core-shell structured ZnS-C nanoparticles with enhanced electrochemical properties for high-performance lithium-ion battery anodes

High‐Energy‐Density Aqueous Magnesium‐Ion Battery Based on a Carbon‐Coated FeVO4 Anode and a Mg‐OMS‐1 Cathode

“…However, for the FeVO 4 /C sample, it is clear that the amount of macropores is less than that of FeVO 4 , and the peak at 8.5 nm also proves the existence of mesopores, which may be derive from carbon (as shown in Figure S3 in the Supporting Information) and FeVO 4 after the recalcination process under an argon atmosphere. These results indicate that, after the carbon‐coating process, FeVO 4 /C exhibits a hierarchical porous structure, which not only provides fast transport pathways for electrons due to macroscopic conductivity, but also improves the permeability between the electrode and electrolyte as a result of the mesopore structure . Additionally, an appropriate amount of carbon source can enhance the electrical conductivity by improving the degree of graphitization of carbon and prevent the aggregation of particles during cycling, which is in good agreement with the reported esterification reaction .…”

“…These results indicate that, after the carbon-coating process, FeVO 4 /C exhibitsahierarchical porouss tructure, which not only provides fast transport pathways for electrons due to macroscopic conductivity,but also improves the permeability between the electrode and electrolyte as ar esult of the mesopore structure. [22] Additionally,a na ppropriate amount of carbon source can enhancet he electrical conductivity by improvingt he degree of graphitization of carbon and prevent the aggregation of particles during cycling, which is in good agreement with the reported esterification reaction. [20] Therefore, FeVO 4 /C synthesized by using am ixture of sucrose and citric acid is more beneficialf or magnesium-ion insertion/deinsertion, and is also believed to demonstrate better electrochemicalperformance.…”

“…Another phenomenon is also clearly observed, as indicatedb yt he blue frame in Figure4a, which is the appearance of the oxygen reaction (side reaction). However,side reactions will not occur for the FeVO 4 /C electrode, as exhibitedi n Figure 4b.T he FeVO 4 /C sample not only suppresses electrode polarization,b ut also mitigates the occurrence of side reactions, [22,23] and displays ab etter electrochemical performance, which is more suitable for ag ood anode materiali na queous rechargeable magnesium-ion batteries.…”

ZnS Nanotubes/Carbon Cloth as a Reversible and High‐Capacity Anode Material for Lithium‐Ion Batteries

“…Du et al. synthesized nanocrystalline ZnS/C with core/shell structure by a simple solvothermal process and an annealing process . Nevertheless, those experiments including coating technique to fabricate electrode materials exhibit many disadvantages as they suffer from rather complicated synthetic procedures and always present a weak contact between active materials and collector along with underutilization of active materials .…”

Revealing the Simultaneous Effects of Conductivity and Amorphous Nature of Atomic‐Layer‐Deposited Double‐Anion‐Based Zinc Oxysulfide as Superior Anodes in Na‐Ion Batteries

“…Similarly, the pristine ZnS anode also showed a very high initial capacity compared to ZnOS‐5:1 (Figure a), which may be attributed to the higher electrochemical activity of the sulfides than its oxide counterparts. However, pristine ZnS anode suffered a drastic loss in specific capacity, which may be due to a severe volume change owing to the sodiation/desodiation during the charge–discharge cycling process, that probably resulting in a rapid collapse of the ZnS electrode material and continuous damage of the SEI layer (shown in the SEM image) 24,27c,39. From the EIS measurements after 500 cycles (Figure b), it is clear that the ZnS anode revealed the lowest R ct value compared to the ZnOS‐5:1 and ZnO anodes, which could also be indicated the severe damage of the ZnS electrode that possibly leads to the direct contact of the electrolyte with the SS current corrector.…”