ORNL Highlights

1-10 of 225 Results

Review Finds Ionization Can Heal or Harm Materials
— An invited review on latest advances in ion beam modification of materials provides conclusive evidence that energy loss by energetic ions to electrons (ionization) can lead to either self-healing of radiation damage created by atomic collisions or contribute to radiation damage.

Iodine-coordinated sulfide leads to an exceptionally stable ceramic electrolyte
— Coordination of iodine atoms within the Li3PS4 (LPS) electrolyte results in a new ceramic electrolyte with the formulation Li7P2S8I, a coordinated material between LPS and LiI. This new formulation takes advantage of the chemical stability of LiI to render an electrolyte with excellent compatability with Li anode.

Thin magnetic crystals are path to ferromagnetic graphene
— Chromium triiodide (CrI3) crystals were identified as a promising platform for studying how magnetism can enhance electronic behaviors in materials that are only a few atoms thick. Development of such ultra-thin magnetic materials may be crucial for continued advancement in miniaturization and performance enhancement of electronic devices.

Researchers map atomic movements that trigger voltage fade in high-energy-density batteries
— ORNL researchers performed powder neutron diffraction experiments on high-voltage, high-capacity lithium- and manganese-rich nickel−manganese−cobalt layered composite oxides (LMR-NMCs) to obtain insights into the degradation mechanisms causing voltage fade in this high-potential cathode material.

Scientists Connect Thermoelectric Materials and Topological Insulators
— Quantum mechanical calculations of electronic structure and transport for Bi2Te3 and its sister material Bi2Te2Se solved the long-standing puzzle of why many materials that are topological insulators are also excellent thermoelectrics.

Rig designed to study effect of vibration on spent nuclear fuel
— Researchers have developed an innovative system, called Cyclic Integrated Reversible-bending Fatigue Tester (CIRFT), to test and evaluate the mechanical behavior of spent nuclear fuel (SNF) under normal transportation conditions. The SNF fatigue data generated by CIRFT technology are essential in assisting back end fuel cycle reliability investigation.

Synergy of Ionization with Defects Creates Amorphous Track
— A colossal synergy, orders of magnitude larger than anything previously reported, has been discovered to occur between electronic energy loss by ions and pre-existing atomic defects created by elastic energy loss in single-crystal strontium titanate (SrTiO3). This synergy results in the formation of nanometer-sized amorphous tracks, but only in the region with pre-existing defects.

Facets and disorder hold key to battery materials performance
— A synergistic combination of atomic-scale experiment and theory identify Ni antisites as the predominant defects in a lithium–manganese-rich cathode material. In addition, their formation energies are facet-dependent, with larger defect concentrations observed at open (010) facets.

Single Supported Atoms Participate in Catalytic Processes
— Researchers recently predicted and demonstrated that single supported Pt atoms are highly active for NO oxidation. This work will impact determining the optimum loading of noble metals on emissions-treatment catalysts and design of low-temperature catalysts.

Understanding Why Silicon Anodes of Lithium-Ion Batteries Are Fast to Discharge but Slow to Charge
— Silicon anodes for lithium-ion batteries are capable of quickly delivering high power but charge at a much lower rate. High-power and high-rate performance of batteries is determined by the intrinsic electrochemical reaction rates. The forward and backward reaction rates for reversible electrochemical reactions are not necessarily identical.


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