High Lithium Storage Performance of FeS Nanodots in Porous Graphitic Carbon Nanowires

Abstract

Much attention has been paid to increase the energy density of Li‐ion batteries, in order to fulfill the requirements of electric vehicles and grid‐scale energy storage. While for anodes various options are available, this is not at all the case for cathodes. In this context, the inexpensive and environmentally benign iron sulfides have been investigated as cathode materials due to the remarkably high capacity based on the conversion reaction. Here, the preparation of FeS nanodots accommodated in porous graphitic carbon nanowires is reported via a combination of electrospinning technique and biomolecular‐assisted hydrothermal method. These materials exhibit excellent electrochemical performances also as cathode materials, with energy densities even higher than the current LiCoO2 intercalation cathode. Moreover, key problems of conversion reaction, such as the low degree of reversibility, large polarization are far‐reachingly mitigated.

Porous Carbon Nitride Frameworks Derived from Covalent Triazine Framework Anchored Ag Nanoparticles for Catalytic CO2 Conversion

“…The wide‐angle X‐ray diffraction (WAXRD) patterns of PCNF‐ T exhibit similar diffraction features, with two diffraction peaks at around 24° and 44° (Figure b). The broad peak at 24° can be assigned to the (002) planes of amorphous graphitic carbon, which suggests that amorphous carbon atoms partially convert to graphite. Moreover, the weak peak at 44°, with a low and increased intensity, indicates the intralayer condensation of the materials and the defect in the graphite layers that is due to nitrogen dopants at different pyrolysis temperature (see the Supporting Information, Figure S1) .…”

MOF‐Derived Hollow Co9S8 Nanoparticles Embedded in Graphitic Carbon Nanocages with Superior Li‐Ion Storage

“…In principle, in spite of its relatively low potential (an average voltage of about 1.7 V), Co 9 S 8 is suited as cathode materials in terms of energy density, as its capacity (Co 9 S 8 544 mA h g −1 vs LiCoO 2 140 mA h g −1 ) exceeds that of LiCoO 2 , leading to a higher theoretical energy density when compared to LiCoO 2 . Microstructure engineering and blending with well‐conductive materials (e.g., porous carbon, conductive polymer) have been applied to address the problems associated with the conversion reaction . Specially, the rationally engineering of electroactive materials in terms of coherent porous nanostructures with hollow interior not only allows for easy access of Li + and reduction of the transport paths but also provides additional free volume to alleviate the strain associated with repeated Li + insertion/extraction, thus leading to improved reversibility and rate capability .…”

“…Microstructure engineering and blending with well‐conductive materials (e.g., porous carbon, conductive polymer) have been applied to address the problems associated with the conversion reaction . Specially, the rationally engineering of electroactive materials in terms of coherent porous nanostructures with hollow interior not only allows for easy access of Li + and reduction of the transport paths but also provides additional free volume to alleviate the strain associated with repeated Li + insertion/extraction, thus leading to improved reversibility and rate capability . In our previous work dealing with FeS 2 cathode, we prepared an FeS 2 @C nanostructure, in which porous FeS 2 nanooctahedra were fully encapsulated by uniform carbon nanocages, exhibiting superior rate capability and stable cycling performance .…”

In Situ Construction of 3D Interconnected FeS@Fe3C@Graphitic Carbon Networks for High‐Performance Sodium‐Ion Batteries

“…[9][10][11][12][13][14][15] Among them, iron sulfide (FeS) undergoes a sodiation/ desodiation process via the following reaction: FeS + 2Na + 2e − → Na 2 S + Fe, offering a high theoretical capacity of 609 mA h g −1 . [9][10][11][12][13][14][15] Among them, iron sulfide (FeS) undergoes a sodiation/ desodiation process via the following reaction: FeS + 2Na + 2e − → Na 2 S + Fe, offering a high theoretical capacity of 609 mA h g −1 .…”