Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 5, Issue 11, Pages 5383-5389Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c7ta00030h
Keywords
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Funding
- National Natural Science Foundation of China [21522602, 51672082, 91534202, 51461135004]
- International Science and Technology Cooperation Program of China [2015DFA51220]
- Shanghai Rising-Star Program [15QA1401200]
- Research Project of Chinese Ministry of Education [113026A]
- Program for New Century Excellent Talents in University [NCET-13-0796]
- Fundamental Research Funds for the Central Universities
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The exploitation of high-capacity and long-life MoS2-based materials is highly important for developing lithium ion batteries (LIBs) and sodium ion batteries (SIBs). Herein, we demonstrate the confined synthesis of 2D MoS2/ polyaniline (MoS2/PANI) nanosheet heterostructures with well-defined interfaces, in which the interlayer distance of MoS2 is greatly enlarged from 0.62 nm to 1.08 nm. The introduction of such a big interlayer distance for efficient Li+/Na+ storage has never been demonstrated before. The unique MoS2/PANI nanosheets can address well the key challenges of traditional MoS2 anode materials related to low conductivity particularly in the vertical direction, easy restacking/aggregation, large volumetric change and sluggish Li+/Na+ diffusion kinetics in the interlamination. Consequently, they deliver a high reversible capacity, superior rate capability and long cycle life for both LIBs and SIBs. A state-of-the-art ab initio molecular dynamics (AIMD) simulation also reveals that MoS2/PANI nanosheets with enlarged interlayer spacing possess a remarkably improved Li+/Na+ diffusion mobility compared to pristine MoS2 nanosheets. The present material design concept opens new directions for finding efficient LIBs/SIBs anodes with high capacity, rate capability and stability.
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