Production Of Li6 Research Articles

Characterizing the Stability and Kinetics of Hybrid Oxide-Sulfide Solid Electrolyte Cells

Growing energy applications and markets demand safer and higher performance Li-ion batteries. All solid-state batteries (ASSBs) represent a significant step forward in Li-ion battery technology. We have recently described the production of Li6.25La3Al0.25Zr2O12 (LLZO) solid state electrolyte (SSE). LLZO provides high room temperature ionic conductivities as well as chemical and mechanical stability towards metallic Li, which has 10X the specific capacity of a carbon anode. Sulfide based SSEs have high room temperatures conductivities, but their chemical and mechanical stability towards metallic Li has not been well defined. Here, we describe the construction of ASSBs with a metallic Li anode, a solid oxide electrolyte (LLZO), and a composite cathode consisting of an 75Li2S:25P2S5 sulfide electrolyte and TiS2 cathode. This architecture isolates the Li anode from the sulfide SSE and allows for facile assembly with a cold-pressed composite cathode powder. Electrochemical impedance spectroscopy (EIS) was used to probe the electrochemistry of the LLZO/Li2S:P2S5 interface as a function of temperature, pressure, and current density. DC cycling at 70°C and post mortem materials characterization were performed to determine the long-term stability of the hybrid oxide/sulfide interface.

Can black hole accretion produce Li-7?

An investigation has been made of spallation nuclear processes in an ion pressure-supported accretion torus around a black hole. It has been found that, within the torus, Be-9, B-10, and B-11 are produced in cosmic abundance ratios relative to Li-7, while D and He-3 production is relatively small, and Li-6 production is high by a factor of 3. However, Li-6 nuclei produced in the torus are preferentially destroyed in cooler regions, hence outflow from the torus may effectively serve to enrich the universe with Li-7. It is shown that the ion torus that may exist around a black hole at the Galactic center, or the hypothetical black holes which constitute the Galactic dark matter, could have been the site of Li-7 production. In case of the dark matter black holes, for plausible accretion disk viscosities, this mechanism requires massive black holes of M greater than 500 solar masses. 43 refs.

Light-element production by cosmological cosmic rays

view Abstract Citations (22) References (29) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Light-element production by cosmological cosmic rays. Montmerle, T. Abstract The shape of the spectrum of the gamma-ray background in the range from 1 to 100 MeV strongly suggests an origin for the gamma-rays that involves neutral-pion decay. The possibility is considered that the neutral pions resulted from interactions at high redshifts between high-energy particles (cosmological cosmic rays, CCR) and the gaseous component of the ambient medium in the framework of big-bang cosmology. It is assumed that the gamma rays were produced essentially via high-energy interactions of CCR protons or alpha particles with the ambient gas and also that low-energy interactions took place which gave rise to the light elements D, He-3, Li-6, Li-7, and Be-7. Previous results on Li-7 and Li-6 production are summarized which show that the CCR hypothesis may account for both the gamma-ray background spectrum and the Li-7 abundance, but yields an overabundance of Li-6. Quantitative estimates are made which indicate that the CCR-produced D abundance can be as much as 20 percent of the observed value and that the CCR-produced He-3 abundance should be about the same percentage. It is noted that overproduction of Li-6 can be avoided without affecting the results for the gamma-ray background spectrum by reducing the CCR flux. Publication: The Astrophysical Journal Pub Date: November 1977 DOI: 10.1086/155633 Bibcode: 1977ApJ...217..878M Keywords: Background Radiation; Big Bang Cosmology; Cosmic Rays; Cosmology; Gamma Rays; Light Elements; Nuclear Interactions; Abundance; Beryllium Isotopes; Deuterium; Energy Spectra; Lithium Isotopes; Red Shift; Astrophysics full text sources ADS |