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Results for “Entropy”
Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.
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Ion irradiation response and mechanical behavior of reduced activity high entropy alloy
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Local structure and conversion chemistry of high-entropy oxides as Li-ion anodes
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Understanding the heat generation mechanisms and the interplay between joule heat and entropy effects as a function of state of charge in lithium-ion batteries
The thermal performance of lithium-ion battery cells is critical for ensuring their safe and reliable operation across various applications. In this study, we employed an isothermal calorimetry method to investigate the heat generation of commercial 18650 lithium-ion battery fresh cells during charge and discharge at different current rates, ranging from 0.05C to 0.5C, and across various temperatures: 20 °C, 30 °C, 40 °C, and 50 °C. Our findings revealed a direct correlation between heat generation and current rates, indicating that higher current rates lead to increased heat generation within the cells. Conversely, we observed that heat generation remained relatively stable as the temperature rose, suggesting that temperature changes within this range may not significantly impact the heat generation of fresh cells during typical operations. Furthermore, our study explored irreversible heat generation, which depends on the applied current and overpotential, using the galvanostatic intermittent titration technique at 0.05C–0.5C and 30 °C. Additionally, electrochemical impedance spectroscopy was performed on the same cells during charge and discharge at 20 °C, 30 °C, and 40 °C to analyze cell impedance. Finally, our results indicated a consistent dependence of impedance on the state of charge and depth of discharge, with a significant increase in impedance observed at the end of the discharge process.
A second-order maximum-entropy inspired interpolative closure for radiative heat transfer in gray participating media
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Direct versus indirect particle strengthening in a strong, ductile FeNiMnAlTi high entropy alloy
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Lattice distortion as an estimator of solid solution strengthening in high-entropy alloys
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Compositional variations in equiatomic CrMnFeCoNi high-entropy alloys
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The role of intrinsic stacking fault in facilitating the pressure-induced phase transition in CoCrFeMnNi high entropy alloys
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Limiting oxidation of high entropy alloy via high strain-rate deformation: Insights from electrochemical impedance spectroscopy
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Phase equilibria, mechanical properties and design of quaternary refractory high entropy alloys
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Exploration of high entropy ceramics (HECs) with computational thermodynamics - A case study with LaMnO3±δ
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The impact of chemical short-range order on the thermophysical properties of medium- and high-entropy alloys
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