Uniform Yolk–Shell MoS₂@Carbon Microsphere Anodes for High‐Performance Lithium‐Ion Batteries

Abstract

As an electrode material for lithium-ion batteries (LIBs), MoS has attracted much attention because of its high capacity and low cost. However, the rational design of a novel electrode structure with a high capacity, fast charge/discharge rate, and long cycling lifetime remains a great challenge. Herein, a environmentally friendly etching strategy is reported for the construction of monodisperse, inner void-controlled yolk-shell MoS @carbon microspheres. The resulting anode reveals an initial discharge capacity up to 1813 mAh g , a high reversible capacity (1016 mAh g ), excellent cycling stability (200 cycles), and superior rate performance. Such microspheres consist of nanosized MoS yolks (≈280 nm), porous carbon shells (≈25 nm) and well-controlled internal voids in between, opening a new pathway for the optimization of the electrochemical properties of MoS -based anodes without sacrificing their capacity. In addition, this etching strategy offers a new method for the development of functional, hollow MoS -based composites.

Hierarchical MoS2/Carbon Composite Microspheres as Advanced Anodes for Lithium/Sodium‐Ion Batteries

“…[16,17] However,t he application of MoS 2 anodes suffers from several problems: 1) poor rate capability arising from its low electrical conductivity;2 )rapid capacity decay due to pulverization and restacking of MoS 2 nanosheets;3 )unsatisfactory cycling life owing to the shuttlee ffect of polysulfides and loss of active materials during charge/discharge. Construction of nanostructured MoS 2 materials, such as nanosheets, [20] nanofibers, [21,22] microflowers, [23] and nanospheres, [24,25] is considered to be an effective approach for facilitating the fast transfer of ions and thus enhancing the electrochemical performance. Construction of nanostructured MoS 2 materials, such as nanosheets, [20] nanofibers, [21,22] microflowers, [23] and nanospheres, [24,25] is considered to be an effective approach for facilitating the fast transfer of ions and thus enhancing the electrochemical performance.…”

Carbon nanofiber activated by molybdenum disulfide as an effective binder‐free composite anode for highly reversible lithium storage

“…To characterize the composition and chemical structure, Figure exhibits the XPS of MoS 2 /CNF‐A and MoS 2 /CNF‐B. The survey spectrum (Figure A, B) detects the presence of C, O, S, and Mo elements without impurity, consistent with the previously reported data . The peak intensity ratios of S 2p and Mo 3d to C 1 s in MoS 2 /CNF‐A are much bigger than those in MoS 2 /CNF‐B, due to the fact that MoS 2 spheres densely growing on CNFs in MoS 2 /CNF‐A hinder the detection of CNF by XPS.…”

“…The former is ascribed to the lithiation of MoS 2 to Li x MoS 2 (MoS 2 + x Li + + x e − → Li x MoS 2 ), and the later corresponds to the growth of SEI and a conversion reaction in which Li x MoS 2 is reduced to Mo and Li 2 S (MoS 2 + 4Li + + 4e − → 2Li 2 S + Mo) . In the following anodic process, a dominant anodic peak at 2.28 V that is ascribed to Li 2 S to form S (Li 2 S ‐ 2e − ↔ S + 2Li + ). In the second and third CV cycles of MoS 2 /CNF‐A, the peaks are almost overlapped indicating reversible reaction occurred.…”

A Review: Enhanced Anodes of Li/Na-Ion Batteries Based on Yolk–Shell Structured Nanomaterials

“…As shown in Fig. 1 e, the single shell with single core MoS 2 @C was synthesized by an etching strategy [ 68 ]. MoS 2 @PDA core–shell microspheres were transferred to single-shelled YS MoS 2 @C by annealing.…”