Sodium‐Ion Batteries: A Ternary Fe_1−xS@Porous Carbon Nanowires/Reduced Graphene Oxide Hybrid Film Electrode with Superior Volumetric and Gravimetric Capacities for Flexible Sodium Ion Batteries (Adv. Energy Mater. 9/2019)

Abstract

In article number https://doi.org/10.1002/aenm.201803052, Changzhou Yuan, Xiong Wen (David) Lou and co‐workers design and fabricate a ternary Fe1−xS@porous carbon nanowires/reduced graphene oxide (Fe1−xS@PCNWs/rGO) hybrid film anode via scale‐up assembly and sulfuration methodologies. It exhibits superior volumetric and gravimetric capacity toward next‐generation sodium ion batteries. More competitively, a flexible Fe1−xS@PCNWs/rGO‐based full device demonstrates outstanding electrochemical Na‐storage properties, highlighting its enormous potential in versatile flexible and wearable applications.

Promoting Highly Reversible Sodium Storage of Iron Sulfide Hollow Polyhedrons via Cobalt Incorporation and Graphene Wrapping

“…c) Rate performances at various current densities. d) Rate comparison between CoFeS@rGO and reported iron sulfide‐based electrodes . e) Long‐term cycling performance at 1000 mA g −1 .…”

“…For example, Wang et al reported the yolk–shell iron sulfide–carbon nanospheres via a spatially confined sulfurization strategy, which realized a high capacity of 545 mAh g −1 after 100 cycles. Liu et al developed a hierarchical iron sulfide@porous carbon/reduced graphene oxide composite by an assembly and sulfurization strategy, which delivered a reversible capacity of 573 mAh g −1 over 100 cycles. Despite these successful reports, some challenges and inadequacies still remain in SIBs application with these iron sulfide‐based materials: i) In most cases the nanostructured iron sulfides still cannot effectively accommodate the large volume change during long‐term cycling, making it difficult to achieve a long cycle life over 1000 cycles.…”

Effects of Mn‐Doping on the Structural and Electrochemical Properties of Na3Ni2SbO6 for Sodium‐Ion Battery.

“…These include multidimensional structures with freely movable sodium ions such as Na x MO 2 , Na x MAO 4 , Na x MP 2 O 7 , and Na x M 2 (PO 4 ) 3 , in which M is typically the transition metal. Nevertheless, most sodium‐ion cathode materials show insufficient energy densities and poor cycle performances, further triggering the development of their cation‐, anion‐substituted derivatives or other more conductive carbon components . Doping with either a transition or non‐transition metal is a common practice in the design of intercalation hosts for lithium‐ion and sodium‐ion batteries.…”

Dual‐Function Sacrificing Template‐Directed Strategy for Constructing Hollow and Core‐Shell Nonstoichiometric Fe1–xS@C Microspheres Exhibiting Ultrafast Sodium Storage

“…Generally speaking, transition metal sulfides could provide a wider interlayer or channel space for Na‐ion transport and storage than their metal oxide counterparts, enabling a better reversibility and smaller volume variation during sodiation/desodiation reactions . Among all the transition metal sulfides reported for SIBs application, iron sulfides have drawn tremendous attentions due to their high theoretical capacity, low cost, nontoxicity, and easy availability . Nonetheless, the low intrinsic conductivity of iron sulfides unavoidably results in sluggish sodiation/desodiation kinetics and poor rate capability .…”