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Tubular-like Nanocomposites with Embedded Cu 9 S 5 -MoS x Crystalline-Amorphous Heterostructure in N-Doped Carbon as Li-Ion Batteries Anode toward Ultralong Cycling Stability.
- Source :
-
ACS applied materials & interfaces [ACS Appl Mater Interfaces] 2024 Aug 28; Vol. 16 (34), pp. 44678-44688. Date of Electronic Publication: 2024 Aug 17. - Publication Year :
- 2024
-
Abstract
- Transition metal sulfides (TMSs) show the potential to be competitive candidates as next-generation anode materials for Li-ion batteries (LIBs) due to their high theoretical specific capacity. However, sluggish ionic/electronic transportation and huge volume change upon lithiation/delithiation remain major challenges in developing practical TMS anodes. We rationally combine structural design and interface engineering to fabricate a tubular-like nanocomposite with embedded crystalline Cu <subscript>9</subscript> S5 nanoparticles and amorphous MoS <subscript> x </subscript> in a carbon matrix (C/Cu <subscript>9</subscript> S <subscript>5</subscript> -MoS <subscript> x </subscript> NTs). On the one hand, the hybrid integrated the advantages of 1D hollow nanostructures and carbonaceous materials, whose high surface-to-volume ratios, inner void, flexibility, and high electronic conductivity not only enhance ion/electron transfer kinetics but also effectively buffer the volume changes of metal sulfides during charge/discharge. On the other hand, the formation of crystalline-amorphous heterostructures between Cu <subscript>9</subscript> S <subscript>5</subscript> and MoS <subscript> x </subscript> could further boost charge transfer due to an induced built-in electric field at the interface and the presence of a long-range disorder phase. In addition, amorphous MoS <subscript> x </subscript> offers an extra elastic buffer layer to release the fracture risk of Cu <subscript>9</subscript> S <subscript>5</subscript> crystalline nanoparticles during repetitive electrochemical reactions. Benefiting from the above synergistic effect, the C/Cu <subscript>9</subscript> S <subscript>5</subscript> -MoS <subscript> x </subscript> electrode as an LIB anode in an ether-based electrolyte achieves a high-rate capability (445 mAh g <superscript>-1</superscript> at 6 A g <superscript>-1</superscript> ) and superior ultralong-term cycling stability, which delivers an initial discharge capacity of 561 mAh g <superscript>-1</superscript> at 2 A g <superscript>-1</superscript> and its retention capacity after 3600 cycles (376 mAh g <superscript>-1</superscript> ) remains higher than that of commercial graphite (372 mAh g <superscript>-1</superscript> ).
Details
- Language :
- English
- ISSN :
- 1944-8252
- Volume :
- 16
- Issue :
- 34
- Database :
- MEDLINE
- Journal :
- ACS applied materials & interfaces
- Publication Type :
- Academic Journal
- Accession number :
- 39153008
- Full Text :
- https://doi.org/10.1021/acsami.4c06752