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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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Non-innocent Intercalation of Diamines into Tetragonal FeS Superconductor
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Factors Controlling Intercalation of Metal Atoms into WS 2 : Implications for Electronically Tunable Semiconductors
Not provided.
Transition Metal Migration Can Facilitate Ionic Diffusion in Defect Garnet-Based Intercalation Electrodes
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High-Capacitance Pseudocapacitors from Li[superscript +] Ion Intercalation in Nonporous, Electricall
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Unconventional Charge Transport in MgCr 2 O 4 and Implications for Battery Intercalation Hosts
Ion transport in solid-state cathode materials prescribes a fundamental limit to the rates batteries can operate; therefore, an accurate understanding of ion transport is a critical missing piece to enable new battery technologies, such as magnesium batteries. Based on our conventional understanding of lithium-ion materials, MgCr 2 O 4 is a promising magnesium-ion cathode material given its high capacity, high voltage against an Mg anode, and acceptable computed diffusion barriers. Electrochemical examinations of MgCr 2 O 4 , however, reveal significant energetic limitations. Motivated by these disparate observations; herein, we examine long-range ion transport by electrically polarizing dense pellets of MgCr 2 O 4 . Our conventional understanding of ion transport in battery cathode materials, e.g., Nernst-Einstein conduction, cannot explain the measured response since it neglects frictional interactions between mobile species and their nonideal free energies. In this work, we propose an extended theory that incorporates these interactions and reduces to the Nernst-Einstein conduction under dilute conditions. This theory describes the measured response, and we report the first study of long-range ion transport behavior in MgCr 2 O 4 . We conclusively show that the Mg chemical diffusivity is comparable to lithium-ion electrode materials, whereas the total conductivity is rate-limiting. Given these differences, energy storage in MgCr 2 O 4 is limited by particle-scale voltage drops, unlike lithium-ion particles that are limited by concentration gradients. Future materials design efforts should consider the interspecies interactions described in this extended theory, particularly with respect to multivalent-ion systems and their resultant effects on continuum transport properties.
Near Room-Temperature Intrinsic Exchange Bias in an Fe Intercalated ZrSe 2 Spin Glass
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Regenerable Cu-intercalated MnO2 Layered Cathode for Highly Cyclable Energy Dense Batteries
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Atomic-scale intercalation and defect engineering for enhanced magnetism and optoelectronic properties in atomically thin GeS
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Control of crystal size tailors the electrochemical performance of α-V 2 O 5 as a Mg 2+ intercalation host
Nanosizing α-V 2 O 5 inhibits delamination during cycling in Mg electrolytes, reducing the voltage hysteresis and energy loss on the first cycle. This observation indicates that other factors, not just Mg diffusion, contribute to this energy loss.