Journal
ENERGY STORAGE MATERIALS
Volume 38, Issue -, Pages 344-353Publisher
ELSEVIER
DOI: 10.1016/j.ensm.2021.03.022
Keywords
Binary metal sulfides; Hierarchical structure; Anode material; Energy Storage; Volume expansion
Funding
- National Research Foundation of Korea (NRF) - Korean government (Ministry of Science, ICT and Future Planning) [2019R1A4A2001527]
- Hanyang University [HY-2020]
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Constructing heterostructures by water-based surface exfoliation to create MoS2 nanorod-based electrodes covered with Sn and Mo sulfides/carbon matrix showed superior performance in Li/Na-ion storage applications, attributed to enhanced ion diffusion, charge transfer, and structural stability.
Improving interfacial interactions by constructing heterostructures is gaining interest due to its unique structural benefits for ion-reservoir applications. However, great challenges remain. Herein, we propose MoS2 nanorod-based heterostructures covered with a closely interconnected Sn and Mo sulfides/carbon matrix (SMSC@MS-HS) (engraved by a simple water based surface exfoliation strategy) as an efficient anode material for Li/Na-ion storage. Our hierarchical SMSC@MS-HS electrode achieved remarkable discharge capacities of 1,060 and 490 mAh g(-1) (after 100 cycles at 100 mA g(-1)) for lithium and sodium-ion batteries, respectively, along with high initial coulombic efficiency and rate capability. This well-constructed architecture provided facile Li+/Na+ ion diffusion and enhanced the charge transfer at the heterointerfaces. Meanwhile, the strong coupling of MoS2 with SnS during water exfoliation in the presence of a carbon matrix created a stable and shielded nanostructure, which significantly enhanced electron/ion transport and mitigated the volume expansion during cycling. These benefits were attributed to a prominent capacitive contribution from kinetics study, improved Li+/Na+ diffusion from galvanostatic intermittent titration measurements, and good structural stability from ex-situ analyses.
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