Structural, dielectric, optical, and electrochemical performance of Li4Mo5O17 for ULTCC applications

Khan, Raja Umair; Khan, Izaz Ahmad; Ali, Basit; Muhammad, Raz; Samad, Abdus; Shah, Attaullah; Song, Kaixin; Wang, Dawei

doi:10.1016/j.materresbull.2022.112142

Cited by 10 publications

(9 citation statements)

References 38 publications

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“…The 996 cm –1 peak is assigned to the stretching modes of MoO, the peak at 820 cm –1 is assigned to the bridging oxygen vibrations (Mo–O–Mo), and the 667 cm –1 peak corresponds to O–Mo–O stretch. For comparison, the main Raman peaks of the Li 4 Mo 5 O 17 phase are expected to be at 153, 212, 278, 812, and 868 cm –1 , as reported by Khan et al, and are not found in our measured sample. The Raman spectra presented here that Li 2 Mo 4 O 13 matches previous measurements and calculations, confirming the pure target phase.…”

Section: Resultssupporting

confidence: 73%

“…As a reference, the Raman spectra of the layered structure α-MoO 3 (precursor material) were also measured. α-MoO 3 26 and are not found in our measured sample. The Raman spectra presented here that Li 2 Mo 4 O 13 matches previous measurements and calculations, 22 confirming the pure target phase.…”

Section: ■ Results and Discussioncontrasting

confidence: 57%

“…Rietveld analysis was performed using TOPAS Academic v6. Patterns were refined against the previously experimentally determined structures for MoO 3 and Li 2 Mo 4 O 13 …”

Section: Methodsmentioning

confidence: 99%

“…Patterns were refined against the previously experimentally determined structures for MoO 3 and Li 2 Mo 4 O 13 . 26 Operando XRD was collected using a custom Swageloktype cell with a Be window approximately 250 μm thick, allowing Xray penetration into the cell while cycling. The cell was constructed the same way as described in the following Electrochemistry section, with the exception that the slurry was cast onto a Celgard 2523 separator instead of Cu foil.…”

Section: ■ Introductionmentioning

confidence: 99%

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Controlling Operating Voltages in Molybdenum Oxide Anodes through Inductive Effects

et al. 2023

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As Li-ion batteries are more widely adopted, it becomes important to identify new battery electrode materials made from a greater diversity of elements while improving stability, extracted power, and the ability to charge and discharge rapidly. Early transition metals, such as Nb and Mo, are relatively earth-abundant elements, with oxides that are candidates for next-generation anode materials. However, Mo oxides are limited as battery electrodes due to their intermediate redox voltages. Lowering this voltage could open the door for high-performance Mo-based oxide anodes. Oxidation of the voltage can be employed by adding redox-inactive cations of electropositive elements. This strategy is named the induction effect and has been proposed as a design principle to increase cathode voltages. However, its use on the anode side appears less common. Here, we compare the ionization energy, electrochemistry, and Li diffusivity of the compound Li2Mo4O13 with MoO3, which both start out as Mo6+ compounds before lithiation. The ionization energy values extracted from ultraviolet photoemission spectroscopy support the hypothesis that the alkali metal cation pushes up the valence band. Electrochemical studies in half-cells against Li/Li+ indicate that Li2Mo4O13 can reversibly take up two additional Li ions in the unit cell. Moreover, the addition of Li to the molybdenum oxide structure lowers the voltage by 300 mV for the Mo6+/5+ couple compared to the same redox couple in MoO3 and retains high Li+ diffusivity. This work, in conjunction with experimental redox voltages extracted from prior literature on Ti4+/3+ and Nb5+/4+ redox couples, demonstrates the utility of using inductive effects to tailor the operating voltage of candidate anode materials.

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Section: Resultssupporting

confidence: 73%

Section: ■ Results and Discussioncontrasting

confidence: 57%

“…Rietveld analysis was performed using TOPAS Academic v6. Patterns were refined against the previously experimentally determined structures for MoO 3 and Li 2 Mo 4 O 13 …”

Section: Methodsmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

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Controlling Operating Voltages in Molybdenum Oxide Anodes through Inductive Effects

et al. 2023

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“…High-performance microwave dielectric materials and devices are urgently needed to meet the evolving requirements of the development in the modern tele-communication industry [1][2][3]. The low temperature co-fired ceramic (LTCC) technology with low cost, high performance and high integration gradually becomes the mainstream in electronic components manufacturing.…”

Section: Introductionmentioning

confidence: 99%

Sintering characteristics, phase transitions, and microwave dielectric properties of low-firing [(Na _0.5Bi _0.5) _xBi _{1−
x}](W _xV _{1−
x})O ₄ solid solution ceramics

Xue¹,

Li²,

Fu³

et al. 2023

Journal of Advanced Ceramics

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A series of high-k [(Na0.5Bi0.5)xBi1−x](WxV1−x)O4 solid solution ceramics with a scheelitelike structure are synthesized by a modified solid-state reaction method at a temperature range of 680-760 °C. The monoclinic (0 ≤ x < 0.09) to tetragonal scheelite (0.09 ≤ x ≤ 1.0) structural phase transition is confirmed by XRD, Raman and IR analyses. The effect of structural deformation and order-disorder caused by Na + /Bi 3+ /W 6+ complex substitution on microwave dielectric properties is investigated in detail. The compositional series possess a wide range of variable relative permittivities (24.8 ~ 80) and TCF values (-271.9 ~ 188.9 ppm/°C). The maximum permittivity of 80 and a high Q × f value of ~10,000 GHz are obtained near the phase boundary at x = 0.09. Furthermore, a temperature stable dielectric ceramic sintered at 680 °C with excellent microwave dielectric properties of 𝜺𝜺 𝒓𝒓 = 80.7, Q × f = 9,400 GHz (at 4.1 GHz) and TCF value = -3.8 ppm/°C is designed by mixing the x = 0.07 and x = 0.08 components. In summary, the similar sinterability and structural compatibility of scheelite-like solid solution systems make it potential for the LTCC applications.

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Structure, bond features, and vibrational spectra of novel K2Bi(PO4)(MoO4) microwave dielectric ceramic with ultra-low sintering temperature

Qing,

Zou,

Zhou

et al. 2023

Ceramics International

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Structural, dielectric, optical, and electrochemical performance of Li4Mo5O17 for ULTCC applications

Cited by 10 publications

References 38 publications

Controlling Operating Voltages in Molybdenum Oxide Anodes through Inductive Effects

Controlling Operating Voltages in Molybdenum Oxide Anodes through Inductive Effects

Sintering characteristics, phase transitions, and microwave dielectric properties of low-firing [(Na _0.5Bi _0.5) _xBi _{1−
x}](W _xV _{1−
x})O ₄ solid solution ceramics

Structure, bond features, and vibrational spectra of novel K2Bi(PO4)(MoO4) microwave dielectric ceramic with ultra-low sintering temperature

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Structural, dielectric, optical, and electrochemical performance of Li4Mo5O17 for ULTCC applications

Cited by 10 publications

References 38 publications

Controlling Operating Voltages in Molybdenum Oxide Anodes through Inductive Effects

Controlling Operating Voltages in Molybdenum Oxide Anodes through Inductive Effects

Sintering characteristics, phase transitions, and microwave dielectric properties of low-firing [(Na 0.5Bi 0.5) x Bi 1− x ](W x V 1− x )O 4 solid solution ceramics

Structure, bond features, and vibrational spectra of novel K2Bi(PO4)(MoO4) microwave dielectric ceramic with ultra-low sintering temperature

Contact Info

Product

Resources

About

Sintering characteristics, phase transitions, and microwave dielectric properties of low-firing [(Na _0.5Bi _0.5) _xBi _{1−
x}](W _xV _{1−
x})O ₄ solid solution ceramics