Few‐Layer MoS₂ Nanosheets Encapsulated in N‐Doped Carbon Hollow Spheres as Long‐Life Anode Materials for Lithium‐Ion Batteries

Abstract

Two‐dimensional molybdenum disulfide (MoS2) has been recognized as a promising anode material for lithium‐ion batteries (LIBs) due to its high theoretical capacity, but its rapid capacity decay owing to poor conductivity, structure pulverization, and polysulfide dissolution presents significant challenges in practical applications. Herein, triple‐layered hollow spheres in which MoS2 nanosheets are fully encapsulated between inner carbon and outer nitrogen‐doped carbon (NC) were fabricated. Such an architecture provides high conductivity and efficient lithium‐ion transfer. Moreover, the NC shell prevents aggregation and exfoliation of MoS2 nanosheets and thus maintains the integrity of the nanostructure during the charge/discharge process. As anode materials for LIBs, the C@MoS2@NC hollow spheres deliver a high reversible capacity (747 mA h g−1 after 100 cycles at 100 mA g−1) and excellent long‐cycle performance (650 mA h g−1 after 1000 cycles at 1.0 A g−1), which confirm its potential for high‐performance LIBs.

Encapsulation of 2D MoS2 nanosheets into 1D carbon nanobelts as anodes with enhanced lithium/sodium storage properties

“…In view of this, many studies have been devoted to the structural construction of nanomaterials confined to carbon layers. 27–35 For instance, Liu and co-workers 31 have synthesized MoS 2 nanosheets encapsulated in a nitrogen, sulfur dual-doped carbon nanoprism using high-temperature solvent-free sulfidation of the MoO 3 method, delivering a capacity of 800 mA h g −1 after 300 cycles at 0.1 A g −1 . Wang et al 32 prepared C@MoS 2 @NC hollow spheres through etching SiO 2 templates, and achieved a discharge capacity of 747 mA h g −1 at 0.1 A g −1 .…”

How does Molybdenum Disulfide Store Charge: A Minireview

“…[5] Besides, it has advantages of high theoretical capacityand low cost as electrode materials.Nevertheless, pristine MoS 2 electrodes suffer from poor cycling stabilitya nd huge voltage polarization. [6] Many strategies have been proposed to improve the electrochemical performance of MoS 2 , such as compositing with ac onductive carbonaceous matrix, [7] doping with heteroatoms, [8] defectengineering, [9] enlarging the interlayer spacingo f( 002), [10] synthesizingf ew-layer MoS 2 , [11] or fabricating specialn anostructures. [12] These modified MoS 2 electrodes show excellent cycling stability and rate performance.…”

Hierarchical Hollow Bimetal Oxide Microspheres Synthesized through a Recrystallization Mechanism for High‐Performance Lithium‐Ion Batteries

“…[9] In addition to the chemical components of the material, a rational-designed structure is another key factor to achieve a high energy storage performance. Hierarchical nanostructures consisting of nanoparticles, [10][11] nanorods, [12] and nanosheets [13][14] can shorten the diffusion path of Li-ions and increase the interface area between the electrode and electrolyte, favoring a capacity improvement. Mainly, interconnected nanoparticle subunits promote the generation of voids, which can alleviate the structural stress and buffer the volume variation.…”