Journal: Chemistry of Materials

Article Title: Defect Chemistry of Spinel Cathode Materials—A Case Study of Epitaxial LiMn 2 O 4 Thin Films

doi: 10.1021/acs.chemmater.3c00814

Figure Lengend Snippet: (a) Schematic representation of a typical sample, consisting of a (100)-oriented polished STO single crystal coated with a bilayer of Ti/Pt on the backside and around the edges, an epitaxial SRO thin-film current collector and epitaxial LMO thin film. (b) θ-2θ X-ray diffractogram showing the (h00) reflexes of LMO and SRO, suggesting the presence of an epitaxial LMO/SRO bilayer on the STO (100) substrate. (c) Atomic representation of the (200) SRO //(400) LMO epitaxial relationship, which is confirmed by the high-resolution TEM image of the LMO (top)/SRO (bottom) interface in panel d. For SRO, the in-plane lattice parameter was confirmed by reciprocal space mapping ( Figure S1 ). For LMO, strain relaxation is assumed, resulting in the in- and out-of-plane lattice parameters both being identical to the bulk value of 8.23 Å. (e, f) Atomic-force microscopy images of the LMO thin-film surface, showing the characteristic pyramidal morphology of a (400)-oriented spinel thin film. (g) Bright-field TEM image showing an average LMO film thickness of about 80 nm.

Article Snippet: Sputter targets of LMO and SRO with a diameter of 2′′ were obtained from ALB Materials, USA, and AEM Deposition, China, respectively, and abraded with sandpaper before each use to ensure a constant target stoichiometry for successive depositions.

Techniques: Microscopy

Journal: Chemistry of Materials

Article Title: Defect Chemistry of Spinel Cathode Materials—A Case Study of Epitaxial LiMn 2 O 4 Thin Films

doi: 10.1021/acs.chemmater.3c00814

Figure Lengend Snippet: (a) General one-dimensional transmission line with four distinct terminals. The resistive and capacitive elements at the SRO/LMO and LMO/electrolyte interfaces can be adapted to account for selective blocking behavior. (b) Modified Randles’ circuit obtained by simplification of circuit (a) and replacement of the open Warburg element by an anomalous diffusion element W O * .

Article Snippet: Sputter targets of LMO and SRO with a diameter of 2′′ were obtained from ALB Materials, USA, and AEM Deposition, China, respectively, and abraded with sandpaper before each use to ensure a constant target stoichiometry for successive depositions.

Techniques: Transmission Assay, Blocking Assay, Modification, Diffusion-based Assay