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DOE OSTI2020

Materials Data on VMo by Materials Project

MoV crystallizes in the hexagonal P-6m2 space group. The structure is three-dimensional. V is bonded to six equivalent V and six equivalent Mo atoms to form VV6Mo6 cuboctahedra that share corners with eighteen equivalent VV6Mo6 cuboctahedra, edges with six equivalent VV6Mo6 cuboctahedra, edges with twelve equivalent MoV6Mo6 cuboctahedra, faces with eight equivalent VV6Mo6 cuboctahedra, and faces with twelve equivalent MoV6Mo6 cuboctahedra. All V–V bond lengths are 2.70 Å. All V–Mo bond lengths are 2.86 Å. Mo is bonded to six equivalent V and six equivalent Mo atoms to form MoV6Mo6 cuboctahedra that share corners with eighteen equivalent MoV6Mo6 cuboctahedra, edges with six equivalent MoV6Mo6 cuboctahedra, edges with twelve equivalent VV6Mo6 cuboctahedra, faces with eight equivalent MoV6Mo6 cuboctahedra, and faces with twelve equivalent VV6Mo6 cuboctahedra. All Mo–Mo bond lengths are 2.70 Å.

36 MATERIALS SCIENCE↗

DOE OSTI2024

Electrochemically-Formed Disordered Rock Salt ω-Li x V 9 Mo 6 O 40 as a Fast-Charging Li-Ion Electrode Material

Electrochemically-formed disordered rock salt compounds are an emerging class of Li-ion electrode materials for fast-charging energy storage. However, the specific factors that govern the formation process and the resulting charge storage performance are not well understood. Here, we characterize the transformation mechanism and charge storage properties of an electrochemically-formed disordered rock salt from V 9 Mo 6 O 40 (VMO). The crystal structure of VMO has similar motifs to that of α-V 2 O 5 , a well-studied analogue, but VMO has less mechanical flexibility due to additional corner-sharing octahedra in its structure. As a result, VMO undergoes a single-step transformation pathway, which we characterize through operando X-ray diffraction, and forms an unusual highly distorted lamellar microstructure, as we show with high-resolution transmission electron microscopy. The resulting Li x VMO material shows fast charging and other electrochemical characteristics and performance typical of many nanomaterials, even though the material is composed of relatively large particles.

25 ENERGY STORAGE↗

NASA NTRS2009

Active Missions and the VxOs with THEMIS as an Example

The Virtual Observatories (VxOs) provide a host of services to data producers and researchers. They help data producers to describe their data in standard Space Physics Archive Search and Extract (SPASE) terms that enable scientists to understand data products from a wide range of missions. They offer search interfaces based on specified criteria that help researchers discover conjunctions, prominent events, and intervals of interest. In this talk, we show how VMO services can be used with Time History of Events and Macroscale Interactions during Substorms (THEMIS) observations to identify magnetotail intervals marked by high speed flows, enhanced densities, or high temperatures. We present statistical surveys of when and where these phenomena occur. We then show how the VMO services can be used to identify events in which two or more THEMIS spacecraft observe specified features for more detailed analysis. We conclude by discussing the current limitations of VMO tools and outline plans for the future.

Sibeck, D. G.↗