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Published on: August 28, 2018
Bond-Engineered MoSe2 Nanosheets with Expanded Layers and an Enriched 1T Phase for Highly Efficient Na+ Storage
Fenglian Gong1, Ying Xiao1, Gang He1
1Key Laboratory of Organic-Inorganic Composites, Beijing Key Laboratory of Electrochemical Process and Technology for Materials, College of Materials Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, P. R. China.
This study enhances molybdenum diselenide (MoSe2) for sodium-ion (Na+) battery anodes by creating strong P-Se bonds and using 1T phase engineering with carbon composites. This strategy significantly improves stability and rate capability for long-lasting batteries.
Area of Science:
- Materials Science
- Electrochemistry
- Nanotechnology
Background:
- Molybdenum diselenide (MoSe2) shows promise for sodium-ion (Na+) storage due to its structure and capacity.
- However, poor conductivity and volume changes limit its performance in batteries.
Purpose of the Study:
- To enhance the stability and electrochemical performance of MoSe2 anodes for Na+ storage.
- To address the limitations of poor conductivity and volume stress in MoSe2.
Main Methods:
- Utilizing phosphorus-selenium (P-Se) bond engineering and 1T phase enrichment of MoSe2.
- Incorporating carbon composites to improve conductivity and structural integrity.
Main Results:
- The P-Se bond enhances structural stability and interlayer spacing.
- 1T phase MoSe2 and carbon composites improve conductivity and Na+ transport kinetics.
- Achieved an ultrastable reversible specific capacity of 347.8 mAh g-1 with 99.1% retention after 1000 cycles at 1 A g-1.
Conclusions:
- The combined strategy of P-Se bonding, phase engineering, and carbon compositing effectively overcomes MoSe2 limitations.
- This approach offers a promising pathway for designing advanced electrode materials for high-performance, long-life rechargeable batteries.
