Growth of LiCoO2 and Li4Ti5O12 Crystals in Lithium Ion Conductive Li2.2C0.75B0.25O3 glass for All-Solid-State Libs
Co3O4, Li2CO3, and Li3BO3 were used as a starting materials for LiCoO2 crystal growth in Li2-xC1-x+yBxO3+2y glass matrix. The volume fraction of LiCoO2 crystal was controlled to be >80% toward the glass matrix. The mixed powders was heated at designated temperature for 1 min to 5 h. Subsequently the powders were cooled to 500°C under temperature controlled conditions. The as obtained composites were structurally characterized by XRD, SEM-EDS, XRD, and TEM. All diffraction lines were in agreement with the ICDD data for LiCoO2. Since the diffraction lines of Li2CO3, and Li3BO3 were not observed, Li2-xC1-x+yBxO3+2y formed amorphous. SEM revealed the idiomorphic LiCoO2 crystal having barreled shape were homogeneously dispersed in the glass flax. Furthermore, the interface was atomically connected without any sub-phases formation, evaluated by TEM, suggesting that the interfaces provide seamless Li+ transportation pathways. Growth of Li4Ti5O12 crystals and futher electrochemical characteristics of these active material crystals will present in the ECS 227th Meeting.