Li-ion storage in orthorhombic hydrated sodium molybdate with oxygen-vacancy defects

Nguyen, Tuan Loi; Vo, Thuan Ngoc; Phung, Viet-Duc; Ayalew, Kaleab; Chun, Dong Won; Luu, Anh Tuyen; Nguyen, Quang Hung; Kim, Il Tae; Moon, Jaeyun

doi:10.1016/j.cej.2022.137174

Cited by 14 publications

(4 citation statements)

References 56 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In addition, compared to Pristine-LLO, the discharge capacity and initial Coulombic efficiency of LLO obtained by the molten salt template method are leapfrogged (detailed data are shown in Table S3). This improvement may be due to the existence of OV and the appropriate amount of Na + lattice doping, which not only effectively reduces the irreversible lithium oxide in the sample, but also increases the lattice spacing to facilitate the intercalation/deintercalation of Li + , which promotes the charge transfer kinetics of Li + [40]. The rate performance is shown in Figure 7b, under different current rates, 15-LLO-Na-OV has the highest rate performance, while 10-LLO-Na-OV and 20-LLO-Na-OV are next, which further illustrates the importance of proper Na + doping.…”

Section: Resultsmentioning

confidence: 99%

Na+ Lattice Doping Induces Oxygen Vacancies to Achieve High Capacity and Mitigate Voltage Decay of Li-Rich Cathodes

Qiu

Zhang

2023

IJMS

View full text Add to dashboard Cite

In this work, we synthesized 1D hollow square rod-shaped MnO2, and then obtained Na+ lattice doped-oxygen vacancy lithium-rich layered oxide by a simple molten salt template strategy. Different from the traditional synthesis method, the hollow square rod-shaped MnO2 in NaCl molten salt provides numerous anchor points for Li, Co, and Ni ions to directly prepare Li1.2Ni0.13Co0.13Mn0.54O2 on the original morphology. Meanwhile, Na+ is also introduced for lattice doping and induces the formation of oxygen vacancy. Therefrom, the modulated sample not only inherits the 1D rod-like morphology but also achieves Na+ lattice doping and oxygen vacancy endowment, which facilitates Li+ diffusion and improves the structural stability of the material. To this end, transmission electron microscopy, high-angle annular dark-field scanning transmission electron microscopy, X-ray photoelectron spectroscopy, and other characterization are used for analysis. In addition, density functional theory is used to further analyze the influence of oxygen vacancy generation on local transition metal ions, and theoretically explain the mechanism of the electrochemical performance of the samples. Therefore, the modulated sample has a high discharge capacity of 282 mAh g−1 and a high capacity retention of 90.02% after 150 cycles. At the same time, the voltage decay per cycle is only 0.0028 V, which is much lower than that of the material (0.0038 V per cycle) prepared without this strategy. In summary, a simple synthesis strategy is proposed, which can realize the morphology control of Li1.2Ni0.13Co0.13Mn0.54O2, doping of Na+ lattice, and inducing the formation of oxygen vacancy, providing a feasible idea for related exploration.

show abstract

Section: Resultsmentioning

confidence: 99%

Na+ Lattice Doping Induces Oxygen Vacancies to Achieve High Capacity and Mitigate Voltage Decay of Li-Rich Cathodes

Qiu

Zhang

2023

IJMS

View full text Add to dashboard Cite

show abstract

“…4 c–f)are separated into two discrete peaks at 529 eV and 531.3 eV. The one at 529 eV can be contributed by M−O (M = Nd, Fe, Mn) bonds [ 20 , [30] , [31] , [32] ]. The peak detected at 531.3 eV could be the result of the V O occurrence inside NdMn x Fe 1-x O 3 particles [ 29 , [33] , [34] , [35] , [36] ].…”

Section: Resultsmentioning

confidence: 99%

“…This indicates the presence of an appropriate amount of V O for better electrochemical performance. The amount of V O has a positive effect on capacity; however, the existence of a large amount of V O can result in the loss of many O (metal oxides) in the structure, which decreases capacity [ 30 , [56] , [57] , [58] ]. In addition, NdMn x Fe 1-x O 3 NPs with x = 0.3 had a small size compared to NdMn x Fe 1-x O 3 NPs with x = 0.1 ( Fig.…”

Section: Resultsmentioning

confidence: 99%

Tailored synthesis of NdMnxFe1-xO3 perovskite nanoparticles with oxygen-vacancy defects for lithium-ion battery anodes

Nguyen,

Mittova

et al. 2023

Heliyon

Self Cite

View full text Add to dashboard Cite

“…Due to their high energy density, extended lifespan, and dependable performance, lithium-ion batteries (LIBs) have dominated the secondary energy storage industry over the past few decades. However, there are significant concerns, especially for large-scale energy storage systems, arising from the high flammability and toxicity of organic electrolytes, insufficient Li sources, and cell production complexity [1][2][3][4][5][6]. Due to the relatively higher abundance of sodium and potassium and their similar chemical characteristics to those of lithium, sodium-ion batteries (SIBs) and potassium-ion batteries (KIBs) have also been the subject of extensive research [7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

The Effect of Oxygen Vacancies on the Diffusion Characteristics of Zn(II) Ions in the Perovskite SrTiO3 Layer: A Computational Study

Ahn

2023

Materials

View full text Add to dashboard Cite

A highly polar perovskite SrTiO3 (STO) layer is considered as one of the promising artificial protective layers for the Zn metal anode of aqueous zinc-ion batteries (AZIBs). Although it has been reported that oxygen vacancies tend to promote Zn(II) ion migration in the STO layer and thereby effectively suppress Zn dendrite growth, there is still a lack of a basic understanding of the quantitative effects of oxygen vacancies on the diffusion characteristics of Zn(II) ions. In this regard, we comprehensively studied the structural features of charge imbalances caused by oxygen vacancies and how these charge imbalances affect the diffusion dynamics of Zn(II) ions by utilizing density functional theory and molecular dynamics simulations. It was found that the charge imbalances are typically localized close to vacancy sites and those Ti atoms that are closest to them, whereas differential charge densities close to Sr atoms are essentially non-existent. We also demonstrated that there is virtually no difference in structural stability between the different locations of oxygen vacancies by analyzing the electronic total energies of STO crystals with the different vacancy locations. As a result, although the structural aspects of charge distribution strongly rely on the relative vacancy locations within the STO crystal, Zn(II) diffusion characteristics stay almost consistent with changing vacancy locations. No preference for vacancy locations causes isotropic Zn(II) ion transport inside the STO layer, which subsequently inhibits the formation of Zn dendrites. Due to the promoted dynamics of Zn(II) ions induced by charge imbalance near the oxygen vacancies, the Zn(II) ion diffusivity in the STO layer monotonously increases with the increasing vacancy concentration ranging from 0% to 16%. However, the growth rate of Zn(II) ion diffusivity tends to slow down at relatively high vacancy concentrations as the imbalance points become saturated across the entire STO domain. The atomic-level understanding of the characteristics of Zn(II) ion diffusion demonstrated in this study is expected to contribute to developing new long-life anode systems for AZIBs.

show abstract

Li-ion storage in orthorhombic hydrated sodium molybdate with oxygen-vacancy defects

Cited by 14 publications

References 56 publications

Na+ Lattice Doping Induces Oxygen Vacancies to Achieve High Capacity and Mitigate Voltage Decay of Li-Rich Cathodes

Na+ Lattice Doping Induces Oxygen Vacancies to Achieve High Capacity and Mitigate Voltage Decay of Li-Rich Cathodes

Tailored synthesis of NdMnxFe1-xO3 perovskite nanoparticles with oxygen-vacancy defects for lithium-ion battery anodes

The Effect of Oxygen Vacancies on the Diffusion Characteristics of Zn(II) Ions in the Perovskite SrTiO3 Layer: A Computational Study

Contact Info

Product

Resources

About