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Improvement of Battery Performance by Surface Modification of Crystalline Solid Electrolyte for All Solid-State Lithium Batteries

Four different types of lithium lanthanum titanate (LLT)/LiCoO2 assemblies were produced by depositing the LiCoO2 cathode on polycrystalline LLT with various surface finishes, in order to investigate effects of the LLT/LiCoO2 interface structure on the electrochemical properties of the assemblies. The potential separations between the anodic and cathodic peaks in the cyclic voltammograms vary significantly with the surface finishes of the LLT. At the interface regions in the assemblies with good electrochemical performances, the formation of the amorphous LLT is confirmed. These preliminary results imply that the apparent interface resistivity can be lowered partly by the intentional formation of the amorphous LLT layer at the interface through the surface modification treatment of the LLT phase.