Journal
JOURNAL OF POWER SOURCES
Volume 476, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jpowsour.2020.228660
Keywords
MoSe2; Carbon; Composite; Sodium-ion batteries; DFT calculations
Funding
- Research Grants Council (GRF) [16207615, 16227016, 16204517, 16208718]
- Innovation and Technology Commission (ITF) of Hong Kong SAR [ITS/001/17, ITS/292/18FP]
- Guangzhou Science and Technology Program [201807010074]
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Sodium-ion batteries have been considered a cost-effective alternative to lithium-ion batteries because of the cheap and abundant sodium reserves. However, the sluggish kinetics arising from the slow ion and electron transport, particularly at high rates, is the main bottleneck of fast sodium storage. Here, few-layer MoSe2 encapsulated by nitrogen/phosphorus (N/P) co-doped carbon and reduced graphene oxide (MoSe2@NPC/rGO) composites are fabricated through a simple polymerization reaction followed by selenization. The two-dimensional composite nanosheets effectively shorten the ion diffusion length while the few-layer MoSe2 exposes a large surface area to the electrolyte. The NPC/rGO sheets intercalated within the composites function as channels for fast electron transfer and surface reactions. First-principles calculations show quick Na transport rates on the surface of MoSe2, and quantitative kinetics analysis reveals a pseudocapacitance-dominated Na+ storage mechanism at high rates. Thanks to the ameliorating functional features and highly reversible conversion reactions, the MoSe2@NPC/rGO electrode delivers a reversible capacity of similar to 340 mA h g(-1) after 500 cycles at 0.5 A g(-1) with a high contribution by surface capacitance. It also possesses a high reversible capacity of similar to 100 mA h g(-1) even at an extremely high current density of 50 A g(-1), presenting potential application as anodes for high-power sodium-ion batteries.
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