Journal
ADVANCED ENERGY MATERIALS
Volume 9, Issue 7, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.201803137
Keywords
2D materials; intercalation; Li-S batteries; MoO3; nanoribbons
Categories
Funding
- National Natural Science Foundation of China [51872012, 11404017]
- National Key Technologies R&D Program of China [2018YFA0306900, 2017YFB0702100]
- Technology Foundation for Selected Overseas Chinese Scholar, Ministry of Human Resources and Social Security of China
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Heteroatom doping strategies have been widely developed to engineer the conductivity and polarity of 2D materials to improve their performance as the host for sulfur cathode in lithium-sulfur batteries. However, further improvement is limited by the inhomogeneity and the small amount of the doping atoms. An intercalation method to improve the conductivity and polarity of 2D-layered alpha-MoO3 nanoribbons is developed here, thus, resulting in much improved electrochemical performance as sulfur host with better rate and cycle performance. The first principle calculations show that the binding energy of MoO3 and lithium polysulfides, lithium sulfide and sulfur is significantly improved after Sn intercalation. The Sn0.063MoO3-S cathode delivers an initial specific capacity of 1390.3 mAh g(-1) at 0.1 C with the Coulombic efficiency up to 99.7% and shows 79.6% retention of the initial capacity over 500 cycles at 1 C rate with a capacity decay of 0.04% per cycle. This intercalation method provides a new strategy to engineer the electrochemical properties of 2D materials.
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