Fabrication of La2/3-xLi3xTiO3(0.03≤x≤0.167) electrolytes for All-solid-state batteries by sol-gel processFabrication of La2/3-xLi3xTiO3(0.03≤x≤0.167) electrolytes for All-solid-state batteries by sol-gel processFabrication of La2/3-xLi3xTiO3(0.03≤x≤0.167) electrolytes for All-solid-state batteries by sol-gel processFabrication of La2/3-xLi3xTiO3(0.03≤x≤0.167) electrolytes for All-solid-state batteries by sol-gel process

초록

The solid state electrolytes La2/3-xLi3xTiO3(0.03≤x≤0.167) with an A-site deficient perovskite structure were synthesized by citric acid-supported sol-gel process. The substitution of lanthanum ions by the lithium ions weakened the bonding energy in the structure and brought about structural distortion from substitution and bottleneck size. The obtained solid electrolytes were investigated by the X-ray diffraction and the scanning electron microscope. A total conductivity of about 10-4 S/cm was obtained at room temperature in the case of x=0.11 due to high resistances of grain boundary. An all-solid-state Pt/Li metals/La0.55Li0.33TiO3/LiFePO4/Pt cell was fabricated to investigate the electrochemical performance and lithium ion chemical diffusion coefficients.