Oxygen vacancy-rich Fe3O4 nanoparticle synthesized via facile electrochemical method as anode material for high-performance lithium-ion batteries. (December 2022)

• Record Type: Journal Article
• Authors: He, Xiaojia; He, Yulin; Wang, Chao; Zhu, Bin; Liu, Anmin; Tang, Hui
• Is Part Of: Journal of physics and chemistry of solids. Volume 171(2022)
• Publication Date: 2022-12
• Subjects: Fe3O4 -- Oxygen vacancy -- Electrochemical synthesis -- Anode materials -- Lithium-ion battery; Solids -- Periodicals; Solides -- Périodiques; Solids; Periodicals; 530.41
• DOI: 10.1016/j.jpcs.2022.111028
• Languages: English
• ISSNs: 0022-3697

Abstract

Abstract: Oxygen vacancies (Ov), which are internal defects of metal oxides, can effectively alter intrinsic properties of materials. Developing an anode material containing Ovs applied in lithium-ion batteries (LIBs) was hypothesized to enhance their electrochemical performance, which has currently attracted extensive attention. Herein, we successfully synthesized three groups of Fe3 O4 nanoparticles with different Ov concentrations by a facile and controllable electrochemical oxidation corrosion method. First, density functional theory was applied to predict the Li-ion storage performance and electronic properties of pristine Fe3 O4 and the synthesized different Ov-content Fe3 O4 materials. When used as an anode material in LIBs, all the three as-prepared Ov-rich Fe3 O4 electrodes possessed excellent cycling performance and high reversibility. After 330 cycles, the reversible capacity achieved 745 mAh g −1, 921 mAh g −1, and 850 mAh g −1, respectively. Ovs in the Fe3 O4 not only promote high electronic conductivity in the materials, but also afford additional active sites for lithiation and delithiation, further enhancing the electrochemical performance. However, excessive Ovs are not conducive to the improvement of lithium storage capacity. Theoretical predictions and experimental results are consistent with each other. This work has great importance in the direction of oxygen defect applications in the field of LIBs. Graphical abstract: Image 1 Highlights: A facile method was proposed to prepare Oxygen Vacancy-rich Fe3 O4 Nanoparticles. The concentration of oxygen vacancies can be adjusted. The synthesized Fe3 O4 (Ov) was applied for LIB with excellent cycling performance. DFT calculations predicted the Li-ion storage capacity and electronic properties. The effect of Ov content on the Li-ion storage performance of Fe3 O4 was discussed.