Recently, Professor Zhu Jixin's team of Nanjing University of Technology reported a kind of V2O5 @ FeOOH hollow nanoflower electrode material with self reconfiguration of volume strain of lithium-ion battery, and showed excellent performance in energy storage of lithium-ion battery. Relevant achievements were published on research under the title of "stereo assembled V2O5 @ FeOOH hole architects with lithium volume structure self reconstruction" (research, 20202360796, DOI: 10.34133 / 2020 / 2360796).
Research background
With the rapid development of clean energy, the research and application of energy storage devices will become a hot energy technology to reduce carbon dioxide emissions, environmental pollution and oil dependence in the future. Lithium-ion batteries have been widely used in electric vehicles, electronic equipment, sensing devices and wearable devices due to their high energy density, low self discharge effect, memory effect and environmental friendliness. Among many lithium anode materials, the vanadium oxide materials in the transition metal oxide family have rich valence states (+ 2 to + 5 valence), which can embed more lithium ions and show excellent lithium storage performance. In addition, heterostructures also show great potential in improving battery capacity and stability. At present, the effective construction of V2O5 based electrode with tunable complex nanostructure still needs further exploration.
research status
Professor Zhu Jixin's team proposed an efficient and simple method to realize the stereoscopic self-assembly of V2O5 @ FeOOH heterostructure under mild conditions (Figure 1). Based on the previous work of adjusting and controlling the multi-level structure of V2O5 electrode material, commercial V2O5 powder was used as the raw material to dissolve at room temperature. By controlling the reaction time of water bath, self-assembly of V2O5 nano chips was induced by Fe (NO3) 3. At the same time of forming hierarchical multi-level structure, FeOOH in-situ deposition was realized and the three-dimensional assembled nano heterostructure was optimized.
Figure 1 Schematic diagram of V2O5 @ FeOOH hollow heterostructure
V2O5 @ FeOOH is self-assembled from ultra-thin nano chips, and has a cavity with a diameter of about 300 nm, with uniform morphology. HRTEM shows the random coverage of amorphous FeOOH on the surface of V2O5. The results of XRD and XPS further indicate the effective regulation of the amorphous content of iron in the heterostructure (Fig. 2).
Fig. 2 microstructure and chemical composition characterization of V2O5 @ FeOOH hollow heterostructure
The composite heterostructure was applied to the negative electrode of Li-ion battery, showing stable reversible capacity and excellent rate performance (the reversible capacity of the electrode can be stable at 960 MAH g-1 at the current density of 200 Ma g-1). The reasons for the excellent performance of V2O5 @ FeOOH heteroelectrode materials can be summarized as follows:
(1) The difference between V2O5 and FeOOH discharge platform effectively limits the volume expansion of nanoflowers in the process of lithium formation and avoids the collapse of electrode structure in the process of charging and discharging;
(2) The existence of amorphous FeOOH region enriches the grain boundary / phase interface of V2O5, produces additional Li + storage sites and diffusion channels, and improves the reaction activity and lithium storage capacity;
(3) In the repeated process of lithium insertion and lithium removal, in addition to strain self reconfiguration through the synergistic effect of V2O5 and FeOOH, the configuration of hollow structure can accelerate the transmission rate of ions and electrons, and further improve the cycle stability of the battery (Figure 3).
Figure 3 electrochemical performance of V2O5 @ FeOOH hollow heterogeneous electrode material for lithium storage
Future outlook
In this work, V2O5 @ FeOOH hybrid hollow nanoflower composite electrode material with excellent performance was designed and prepared, which provides a new direction for the development of low-cost and high-performance anode materials for lithium-ion batteries. This result can be used to optimize other transition metal oxide electrode materials and provide a new idea for the future development of new energy applications.
About the author
Professor Zhu Jixin, doctoral supervisor, mainly engaged in new material design and energy storage, flexible and wearable electronic devices and other research work. In 2012, he received his doctorate from Nanyang University of technology, Singapore. From 2012 to 2015, he worked in Rice University in the United States, innovation center of Munich University of technology in Germany and colloid and interface Institute of Max Planck Institute in Germany. In 2016, he joined Advanced Materials Research Institute of Nanjing University of technology. At present, he has published more than 120 SCI papers in J. am. Chem. SOC., nano lett., angelw. Chem. Int., ed., energy energy energy. SCI. And has been cited more than 8400 times, h index 52, and applied for more than 10 invention patents. The research was supported by the National Natural Science Foundation of China, the national overseas high-level youth talent introduction program, Jiangsu Provincial Outstanding Youth Fund, etc.
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