ZIF-8/ZIF-67-derived 3D amorphous carbon-encapsulated CoS/NCNTs supported on CoS-coated carbon nanofibers as an advanced potassium-ion battery anode

Abstract

A novel three-dimensional AC@CoS/NCNTs/CoS@CNFs composite was synthesized and used as an anode material for KIBs, which exhibited excellent performance.

Metal chalcogenides for potassium storage

“…There are four main approaches to enhance the ionic and electrical conductivity, buffer or accommodate the volume changes, increase the structural integrity and stability, and boost the reaction kinetics of metal chalcogenides (Figure ): limitation of discharge depth, nanostructure engineering, confinement by carbon nanophases, or ternary alloying. The majority of these modification methods described above have already been verified to be effective for potassium‐based energy storage according to the results reported previously . Furthermore, the interface between the anode and electrolyte in PIBs has drawn recent attention and is another non‐negligible factor for stabilizing these energy‐storage systems.…”

“…Hence, in the following sections, we illustrate recently developed metal‐chalcogenide‐based composites anode materials for PIBs, focusing on the aspects of potassium storage mechanisms, design, synthesis methods, measurements, modification strategies, and corresponding performances. To provide a more comprehensive and systematic report, several representative examples are summarized in Table before discussing the details …”

“…Benefitting from the long history of research into LIBs, quite a few metal‐chalcogenide‐based nanostructures and nanocomposites having enhanced potassium storage capabilities have been designed and synthesized. For convenient comparison, the electrochemical performance of typically modified metal chalcogenides for PIBs has been concluded in Figure A . As shown, there is still large room for improvement, especially concerning the large capacity, low discharge voltage, and long‐term cycling stability.…”

“…A, Summary of electrochemical performances of representative metal chalcogenides‐based materials for potassium ion battery (PIB) anodes reported to date . B, Future research focuses on metal chalcogenides for PIBs…”

“…Illustration of the classification and dominant modification strategies that have been reported for metal chalcogenides‐based PIB anodes. Some of the inset pictures are reproduced with permission from Wiley‐VCH, American Chemical Society, The Royal Society of Chemistry and Elsevier …”