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Surface tiny grain-dependent enhanced rate performance of MoO3 nanobelts with pseudocapacitance contribution for lithium-ion battery anode

In order to improve the rate performance of MoO3, a novel MoO3 nanobelt with tiny grains on surface (named as d-MoO3) is fabricated via one-step facile hydrothermal method with citric acid adding, in which citric acid (CA) serves as a weak reductant as well as surface modification agent. When tested...

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Published in:Journal of power sources 2018-07, Vol.392, p.87-93
Main Authors: Cao, Liyun, He, Juju, Li, Jiayin, Yan, Jingwen, Huang, Jianfeng, Qi, Ying, Feng, Liangliang
Format: Article
Language:English
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Summary:In order to improve the rate performance of MoO3, a novel MoO3 nanobelt with tiny grains on surface (named as d-MoO3) is fabricated via one-step facile hydrothermal method with citric acid adding, in which citric acid (CA) serves as a weak reductant as well as surface modification agent. When tested as an anode in LIBs, d-MoO3 displays an improved discharge capacity of 787 mAh·g−1 at 0.1 A g−1 over 100 cycles with capacity retention of ∼91% while MoO3 decays to 50 mAh·g−1 in the 100th cycle. Notably, d-MoO3 delivers enhanced rate capability (536 and 370 mAh·g−1 at high rates of 5 and 10 A g−1 respectively). We consider these excellent electrochemical properties of d-MoO3 electrode are associated with the tiny grains on MoO3 surface, which effectively maintains the electrode's structural integrity. Even though d-MoO3 nanobelt suffers from a degree of in-situ pulverization after several cycles, these pulverized active particles can still maintain stable electrochemical contact and are highly exposed to electrolyte, realizing ultrahigh e−/Li+ diffusion kinetics. In addition, part extrinsic pseudocapacitance contribution to the Li+ storage also explains the high-rate performance. Combining all these merits, d-MoO3 is potentially a high-energy, high-power and well-stable anode material for Li ion batteries (LIBs). •A novel MoO3 nanobelt is produced in one-step facile hydrothermal process.•Enhanced rate performance of MoO3 nanobelt depends on the surface tiny grains.•Part of Li+ storage is originated from the pseudocapacitance process.
ISSN:0378-7753
1873-2755
DOI:10.1016/j.jpowsour.2018.05.001