Fabrication and electrical properties of bulk textured LiCoO2
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 u...
| المؤلفون الرئيسيون: | , , |
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| التنسيق: | Journal article |
| اللغة: | English |
| منشور في: |
2010
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| الملخص: | 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 LiCoO2 c-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. © 2010 The American Ceramic Society. |
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