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All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on LiFeO2 by Materials Project

LiFeO2 is Caswellsilverite-like structured and crystallizes in the tetragonal I4_1/amd space group. The structure is three-dimensional. Li1+ is bonded to six O2- atoms to form LiO6 octahedra that share corners with two equivalent FeO6 octahedra, corners with four equivalent LiO6 octahedra, edges with four equivalent LiO6 octahedra, and edges with eight equivalent FeO6 octahedra. The corner-sharing octahedra tilt angles range from 0–9°. There are four shorter (2.07 Å) and two longer (2.36 Å) Li–O bond lengths. Fe3+ is bonded to six O2- atoms to form FeO6 octahedra that share corners with two equivalent LiO6 octahedra, corners with four equivalent FeO6 octahedra, edges with four equivalent FeO6 octahedra, and edges with eight equivalent LiO6 octahedra. The corner-sharing octahedra tilt angles range from 0–9°. There are two shorter (2.04 Å) and four longer (2.07 Å) Fe–O bond lengths. There are two inequivalent O2- sites. In the first O2- site, O2- is bonded to three equivalent Li1+ and three equivalent Fe3+ atoms to form a mixture of edge and corner-sharing OLi3Fe3 octahedra. The corner-sharing octahedra tilt angles range from 0–9°. In the second O2- site, O2- is bonded to three equivalent Li1+ and three equivalent Fe3+ atoms to form a mixture of edge and corner-sharing OLi3Fe3 octahedra. The corner-sharing octahedra tilt angles range from 0–9°.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on LiFeO2 by Materials Project

LiFeO2 is Caswellsilverite structured and crystallizes in the trigonal R-3m space group. The structure is three-dimensional. Li1+ is bonded to six equivalent O2- atoms to form LiO6 octahedra that share corners with six equivalent FeO6 octahedra, edges with six equivalent LiO6 octahedra, and edges with six equivalent FeO6 octahedra. The corner-sharing octahedral tilt angles are 6°. All Li–O bond lengths are 2.13 Å. Fe3+ is bonded to six equivalent O2- atoms to form FeO6 octahedra that share corners with six equivalent LiO6 octahedra, edges with six equivalent LiO6 octahedra, and edges with six equivalent FeO6 octahedra. The corner-sharing octahedral tilt angles are 6°. All Fe–O bond lengths are 1.97 Å. O2- is bonded to three equivalent Li1+ and three equivalent Fe3+ atoms to form a mixture of edge and corner-sharing OLi3Fe3 octahedra. The corner-sharing octahedral tilt angles are 0°.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on LiFeO2 by Materials Project

Computed materials data using density functional theory calculations. These calculations determine the electronic structure of bulk materials by solving approximations to the Schrodinger equation. For more information, see https://materialsproject.org/docs/calculations

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Li3VFe3O8 by Materials Project

LiVO2(LiFeO2)2FeO2 crystallizes in the triclinic P-1 space group. The structure is one-dimensional and consists of one iron dihydroxide molecule; two LiFeO2 ribbons oriented in the (0, 1, 1) direction; and one LiVO2 ribbon oriented in the (0, 1, 1) direction. In each LiFeO2 ribbon, Li1+ is bonded in a distorted linear geometry to two equivalent O2- atoms. Both Li–O bond lengths are 1.61 Å. Fe+2.67+ is bonded in a linear geometry to two equivalent O2- atoms. Both Fe–O bond lengths are 1.44 Å. O2- is bonded in a distorted bent 150 degrees geometry to one Li1+ and one Fe+2.67+ atom. In the LiVO2 ribbon, Li1+ is bonded in a distorted linear geometry to two equivalent O2- atoms. Both Li–O bond lengths are 1.60 Å. V5+ is bonded in a distorted linear geometry to two equivalent O2- atoms. Both V–O bond lengths are 1.41 Å. O2- is bonded in a linear geometry to one Li1+ and one V5+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Li4Fe3NiO8 by Materials Project

(LiFeO2)3LiNiO2 crystallizes in the triclinic P-1 space group. The structure is one-dimensional and consists of three LiFeO2 ribbons oriented in the (0, 1, 1) direction and one LiNiO2 ribbon oriented in the (0, 1, 1) direction. In each LiFeO2 ribbon, Li1+ is bonded in a linear geometry to two equivalent O2- atoms. Both Li–O bond lengths are 1.59 Å. Fe3+ is bonded in a linear geometry to two equivalent O2- atoms. Both Fe–O bond lengths are 1.42 Å. O2- is bonded in a distorted linear geometry to one Li1+ and one Fe3+ atom. In the LiNiO2 ribbon, Li1+ is bonded in a linear geometry to two equivalent O2- atoms. Both Li–O bond lengths are 1.58 Å. Ni3+ is bonded in a linear geometry to two equivalent O2- atoms. Both Ni–O bond lengths are 1.43 Å. O2- is bonded in a distorted linear geometry to one Li1+ and one Ni3+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Li4TiFe3O8 by Materials Project

LiTiO2(LiFeO2)3 crystallizes in the triclinic P-1 space group. The structure is one-dimensional and consists of three LiFeO2 ribbons oriented in the (0, 1, 1) direction and one LiTiO2 ribbon oriented in the (0, 1, 1) direction. In each LiFeO2 ribbon, Li1+ is bonded in a linear geometry to two equivalent O2- atoms. Both Li–O bond lengths are 1.41 Å. Fe+2.67+ is bonded in a distorted linear geometry to two equivalent O2- atoms. Both Fe–O bond lengths are 1.64 Å. O2- is bonded in a 2-coordinate geometry to one Li1+ and one Fe+2.67+ atom. In the LiTiO2 ribbon, Li1+ is bonded in a linear geometry to two equivalent O2- atoms. Both Li–O bond lengths are 1.62 Å. Ti4+ is bonded in a linear geometry to two equivalent O2- atoms. Both Ti–O bond lengths are 1.39 Å. O2- is bonded in a distorted linear geometry to one Li1+ and one Ti4+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2023

Redox Mechanisms and Migration Tendencies in Earth-Abundant 0.7Li 2 MnO 3 ·0.3LiFeO 2 Cathodes: Coupling Spin-Resolved X-ray Absorption Near Edge and X-ray Absorption Fine Structure Spectroscopies

We report the use of iron 1s3p resonant X-ray emission processes to conduct spin-selective, high-energy resolution fluorescence detected X-ray absorption near-edge spectroscopy (HERFD-XANES) on an iron-containing, lithium- and manganese-rich, fully earth-abundant cathode material, Li 1.3 Mn 0.5 Fe 0.2 O 2 (0.7Li 2 MnO 3 ·0.3LiFeO 2 ). Coupling this technique with conventional Mn K-edge XANES and detailed extended X-ray absorption fine structure (EXAFS) analysis from both the Mn and Fe vantage points, we gain fundamental insights into the redox processes and migration tendencies of transition metals in this cathode material at the bulk level. We show that during the first charge, Fe 3+ undergoes oxidation to form Fe 4+ prior to the activation plateau. Toward the end of activation, a significant fraction of the iron is present as tetrahedral Fe 3+ . This observation reveals that iron migration from octahedral to tetrahedral sites and iron reduction are initiated during activation. Upon first discharge from the activated state, a continuous and overlapping reduction of both Fe and Mn is observed, with Fe largely restored back as an octahedrally coordinated Fe 3+ . The manganese local environment gradually changes to a distorted cooperative Jahn–Teller Mn 3+ structure during discharge, with the clear presence of two Mn–O as well as two Mn–Mn correlation distances at 2.0 V. The significant reduction of manganese in the very first discharge is distinctly different from that seen in typical nickel-based lithium-manganese-rich materials but is similar to that observed for pure Li 2 MnO 3 . In conclusion, these findings shed light on key structure–property correlations in the cathode material and point to a causative relationship between the redox mechanisms as well as structural changes endured by the material and relatively poor performance during extended electrochemical cycling.

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CH↗