Microstructure and microwave dielectric properties of (1−y)Li3NbO4+yLi2TiO3(Li2SnO3) ceramics

Wu, N.X.; Bian, Jian

doi:10.1016/j.mseb.2012.09.004

Cited by 16 publications

(5 citation statements)

References 11 publications

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“…The peak at 140 cm –1 has been reported from Li 3 NbO 4 , and the second characteristic peak around 800 cm –1 of Li 3 NbO 4 may overlap with the peak of cationic DRS structural materials. This is consistent with the results in Li 3 NbO 4 –MgO. , The peak at 226 cm –1 is attributed to the E-vibrational mode of the Nb–O bond in LiNbO 3 . Raman spectra confirm the presence of a cation-disordered distribution in the DRS and different amounts of LN coating on F 0.15 .…”

Section: Resultssupporting

confidence: 89%

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Enhancing the Electrochemical Performances of Disordered Li_1.23Ni_0.3Nb_0.3Fe_0.16O_0.85F_0.15 Cathode Material for Lithium-Ion Batteries by LiNbO_x Coating

Sheng,

Zhao,

Zhang

et al. 2024

ACS Appl. Mater. Interfaces

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For the next generation of lithium-ion batteries (LIBs), it is primary to seek high capacity and long-lifetime electrode materials. Li-excess disordered rock-salt structure (DRS) cathodes have gained much attention due to their high specific capacity. However, Li-excess can lead to a decrease in the structural stability of an electrode material. A new Li-rich DRS oxyfluorides, Li 1.23 Ni 0.3 Nb 0.3 Fe 0.16 O 0.85 F 0.15 (F 0.15 ) with a series amounts of LiNbO x (LN) coating (0, 5, 10, and 15 wt % denoted as F 0.15 -LN 0 , F 0.15 -LN 5 , F 0.15 -LN 10 , and F 0.15 -LN 15 , respectively), are successfully synthesized and evaluated as cathode materials in LIBs. Among them, F 0.15 -LN 10 exhibits the highest initial discharge specific capacity of 296.1 mAh g −1 (at a current density of 20 mA g −1 ) with the capacity retention rate of 14% higher than that of the uncoated F 0.15 after 80 cycles. Even at 300 mA g −1 , F 0.15 -LN 10 still delivers the highest discharge specific capacity of 130 mAh g −1 . After 20 cycles, the charge-transfer impedance of F 0.15 -LN 10 remained the smallest. The characterizations indicate that LN coating reduces the surface polarization of the cathode materials, slows the interfacial side reactions between the electrolyte and the electrode, and speeds up the Li + diffusion. These results demonstrate that LN coating is an effective strategy to improve the electrochemical performance.

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Section: Resultssupporting

confidence: 89%

“…This is consistent with the results in Li 3 NbO 4 −MgO. 34,35 The peak at 226 cm −1 is attributed to the E-vibrational mode of the Nb−O bond in LiNbO 3 . 36 Raman spectra confirm the presence of a cationdisordered distribution in the DRS and different amounts of LN coating on F 0.15 .…”

Section: Structure and Morphological Characterizationsupporting

confidence: 91%

Enhancing the Electrochemical Performances of Disordered Li_1.23Ni_0.3Nb_0.3Fe_0.16O_0.85F_0.15 Cathode Material for Lithium-Ion Batteries by LiNbO_x Coating

Sheng,

Zhao,

Zhang

et al. 2024

ACS Appl. Mater. Interfaces

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“…Specifically, there were favorable compounds of Li 2 Mg 3 SnO 6 (ε r = 8.8, Q × f = 123,000 GHz, τ f = −32 ppm/°C) and Li 4 MgSn 2 O 7 (ε r = 13.5, Q × f = 126,810 GHz, τ f = −4.2 ppm/°C), and this optimal Q × f value were the members of the Li 2 SnO 3 –MgO system, exhibiting excellent properties. Moreover, the studies conducted by Bian et al also revealed the phenomena of solid solution formation and dielectric propertie enhancement in Li (3–3 x ) Mg 4 x Nb (1– x ) O 4 and Li 3 NbO 4 –Li 2 SnO 3 rock-salt systems. , The studies mentioned above indicated that the complex substitutions of the nonequivalent ions in some of the rock-salt structures could result in phase transitions in a solid solution system, and a range of excellent dielectric properties might be generated by the ordering transition and structural changes. The driving force of the phase transition induced by the compositional changes might be related to the Coulombic destabilization and lattice distortions. , However, there was scarcely any study focused on the relationship between the ordering and dielectric properties of the rock-salt ceramics, even though the cation ordering played a vital role in the quality factors of the ceramics with other structures, such as in perovskites .…”

Section: Introductionmentioning

confidence: 96%

“…Moreover, the studies conducted by Bian et al also revealed the phenomena of solid solution formation and dielectric propertie enhancement in Li (3−3x) Mg 4x Nb (1−x) O 4 and Li 3 NbO 4 −Li 2 SnO 3 rock-salt systems. 16,17 The studies mentioned above indicated that the complex substitutions of the nonequivalent ions in some of the rock-salt structures could result in phase transitions in a solid solution system, and a range of excellent dielectric properties might be generated by the ordering transition and structural changes. The driving force of the phase transition induced by the compositional changes might be related to the Coulombic destabilization and lattice distortions.…”

Section: Introductionmentioning

confidence: 99%

Effects of Lattice Evolution and Ordering on the Microwave Dielectric Properties of Tin-Modified Li₃Mg₂NbO₆-Based Ceramics

Zhang

Zhang²,

Fang

et al. 2020

J. Phys. Chem. C

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In this contribution, the evolution of the crystal structure and the consequent effects on the microwave dielectric responses of the Sn 4+ -substituted Li 3 Mg 2−x/3 Sn x Nb 1−2x/3 O 6 (0 ≤ x ≤ 1.5) ceramics were investigated as a function of the doping content. Interestingly, a wide range of solid solution (0 ≤ x ≤ 1.1) was obtained by the complex substitutions of Sn ions, and a composition-driven phase transition from the orthorhombic to cubic phase accompanied by an order−disorder transformation occurring in the range of 0.1 ≤ x ≤ 0.7. During the process of the phase transition, high-resolution transmission electron microscopy images showed the presence of a coherent phase boundary between the orthorhombic and cubic phases, which was formed owing to their similar rock-salt crystal configurations and small mismatches in the subcell−lattice parameters. Besides, the electron diffraction patterns indicated that the specimen with relatively low Sn concentration (x = 0.2) contained reconstructed superlattices. The unique layered structure of the end-member Li 3 Mg 2 NbO 6 constrained the form of the substitution for the dopant ions, where the nonequivalent ions (Sn 4+ ) were expected to enter into the Nb−Mg−Nb clusters in the Nb-rich layers preferentially, which was likely to be the cause of the formation of the reconstructed superlattices. The substitution-induced superlattices were highly related to the low dielectric loss of the specimens, and a small amount of Sn doping (0 ≤ x ≤ 0.3 mol) also lowered the internal strain of the samples. As the Sn concentration increased from 0 to 0.3, the quality factors (Q × f) were significantly enhanced from 91,700 to 118,700 GHz with the emergence of the reconstructed superlattices and the lowered internal strain.

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“…Cu 1/3 Nb 2/3 doped ceramics with 3 wt% H 3 BO 3 were designed as a patch antenna and a dielectric resonator antenna [221]. The solid solution of Li 2 TiO 3 -MgO [222], Li 2 TiO 3 -ZnO [223,224], and Li 2 TiO 3 -Li 3 NbO 4 [225] attracted much interest of researcher owing to their high quality factor. The primarily reported ceramics of Li [224,, and the phase diagram of rock-salt structure is plotted in Fig.…”

Section: Rock-salt Structurementioning

confidence: 99%

The latest process and challenges of microwave dielectric ceramics based on pseudo phase diagrams

et al. 2021

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The explosive process of 5G communication evokes the urgent demand of miniaturized and integrated dielectric ceramics filter. It is a pressing need to advance the development of dielectric ceramics utilization of emerging technology to design new materials and understand the polarization mechanism. This review provides the summary of the study of microwave dielectric ceramics (MWDCs) sintered higher than 1000 from 2010 up to now, °C with the purpose of taking a broad and historical view of these ceramics and illustrating research directions. To date, researchers endeavor to explain the structure-property relationship of ceramics with multitude of approaches and design a new formula or strategy to obtain excellent microwave dielectric properties. There are variety of factors that impact the permittivity, dielectric loss, and temperature stability of dielectric materials, covering intrinsic and extrinsic factors. Many of these factors are often intertwined, which can complicate new dielectric material discovery and the mechanism investigation. Because of the various ceramics systems, pseudo phase diagram was used to classify the dielectric materials based on the composition. In this review, the ceramics were firstly divided into ternary systems, and then brief description of the experimental probes and complementary theoretical methods that have been used to discern the intrinsic polarization mechanisms and the origin of intrinsic loss was mentioned. Finally, some perspectives on the future outlook for high-temperature MWDCs were offered based on the synthesis method, characterization techniques, and significant theory developments.

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Microstructure and microwave dielectric properties of (1−y)Li3NbO4+yLi2TiO3(Li2SnO3) ceramics

Cited by 16 publications

References 11 publications

Enhancing the Electrochemical Performances of Disordered Li_1.23Ni_0.3Nb_0.3Fe_0.16O_0.85F_0.15 Cathode Material for Lithium-Ion Batteries by LiNbO_x Coating

Enhancing the Electrochemical Performances of Disordered Li_1.23Ni_0.3Nb_0.3Fe_0.16O_0.85F_0.15 Cathode Material for Lithium-Ion Batteries by LiNbO_x Coating

Effects of Lattice Evolution and Ordering on the Microwave Dielectric Properties of Tin-Modified Li₃Mg₂NbO₆-Based Ceramics

The latest process and challenges of microwave dielectric ceramics based on pseudo phase diagrams

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Microstructure and microwave dielectric properties of (1−y)Li3NbO4+yLi2TiO3(Li2SnO3) ceramics

Cited by 16 publications

References 11 publications

Enhancing the Electrochemical Performances of Disordered Li1.23Ni0.3Nb0.3Fe0.16O0.85F0.15 Cathode Material for Lithium-Ion Batteries by LiNbOx Coating

Enhancing the Electrochemical Performances of Disordered Li1.23Ni0.3Nb0.3Fe0.16O0.85F0.15 Cathode Material for Lithium-Ion Batteries by LiNbOx Coating

Effects of Lattice Evolution and Ordering on the Microwave Dielectric Properties of Tin-Modified Li3Mg2NbO6-Based Ceramics

The latest process and challenges of microwave dielectric ceramics based on pseudo phase diagrams

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Enhancing the Electrochemical Performances of Disordered Li_1.23Ni_0.3Nb_0.3Fe_0.16O_0.85F_0.15 Cathode Material for Lithium-Ion Batteries by LiNbO_x Coating

Enhancing the Electrochemical Performances of Disordered Li_1.23Ni_0.3Nb_0.3Fe_0.16O_0.85F_0.15 Cathode Material for Lithium-Ion Batteries by LiNbO_x Coating

Effects of Lattice Evolution and Ordering on the Microwave Dielectric Properties of Tin-Modified Li₃Mg₂NbO₆-Based Ceramics