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MoV2O8 nanostructures: controlled synthesis and lithium storage mechanism
Zhigang Yin1, Ying Xiao1, Xia Wang1
1Key Laboratory of Cluster Science, Ministry of Education of China, Beijing Key Laboratory of Photoelectronic/Electrophotonic Conversion Materials Department of Chemistry, Beijing Institute of Technology, Beijing 100081, P. R. China. caomh@bit.edu.cn.
Nanoscale
|December 18, 2015
Summary
Surfactant-free MoV2O8 nanorods were synthesized for lithium ion batteries. These nanorods exhibit superior lithium storage capacity and stability compared to bulk materials, offering a promising anode alternative.
Area of Science:
- Materials Science
- Electrochemistry
- Nanotechnology
Background:
- Developing high-performance anode materials is crucial for advancing lithium-ion battery technology.
- Ternary metal oxides offer potential for enhanced electrochemical properties but require optimized synthesis strategies.
Purpose of the Study:
- To develop a facile synthesis route for molybdenum vanadium oxide (MoV2O8) nanorods.
- To evaluate the performance of MoV2O8 nanorods as an anode material for lithium-ion batteries.
- To elucidate the lithium storage mechanism in MoV2O8 nanorods.
Main Methods:
- A two-step synthesis involving solvothermal treatment in acetic acid followed by calcination.
- Electrochemical evaluation of MoV2O8 nanorods as anode material in lithium-ion half-cells.
- In situ and ex situ characterization including X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and transmission electron microscopy (TEM).
Main Results:
- Surfactant-free MoV2O8 nanorods were successfully synthesized.
- The nanorods delivered a high specific capacity of over 1325 mA h g⁻¹ after 50 cycles at 0.2 A g⁻¹, significantly outperforming bulk MoV2O8 (617 mA h g⁻¹).
- Excellent rate capability was observed, maintaining ~570 mA h g⁻¹ at 10.0 A g⁻¹.
Conclusions:
- The developed synthesis strategy yields high-performance MoV2O8 nanorod anode materials.
- MoV2O8 nanorods demonstrate excellent lithium storage capacity, rate performance, and cycling stability.
- The lithium storage mechanism involves phase transformation, intercalation-deintercalation, and partial redox processes, indicating a novel mechanism for ternary metal oxides.
