Abstract
In order to study the orientation dependence of the electrical properties of layered structure cathode materials used in lithium‐ion thin‐film microbatteries, a typical composition, LiCoO2, has been hot‐press sintered in bulk with a strong crystallographic texture. Microstructural characterization using X‐ray diffraction, scanning electron microscopy, and Raman spectroscopy showed that the degree of LiCoO2 texture depended upon the precise hot‐press conditions used. There was a pronounced orientation of the polycrystalline LiCoO2c‐axis in the pressing direction with a high Lotgering factor (f=0.96) for sintering at 950°C. The pronounced texture led to a remarkable anisotropy in electronic conductivity between directions parallel (σ∥) and perpendicular (σ⊥) to the pressing direction in the temperature range 190–400 K, with σ⊥/σ∥=187 at 300 K. The results suggest that texture can be used to tune not only the well‐known electrochemical performance of all‐solid‐state lithium‐ion thin‐film batteries, but also their electronic conductivity.
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