Improving ionic conductivity of polycrystalline lithium ion conductors by interacting with mesoporous materials

• Mesoporous material has been used to interact with Li1.5Al0.5Ge1.5(PO4)3.
• The conductivity of Li1.5Al0.5Ge1.5(PO4)3 has been increased by one order of magnitude.
• The porous structure of mesoporous material was maintained after annealing.

Mesoporous materials were chosen to interact with polycrystalline Li1.5Al0.5Ge1.5(PO4)3 to investigate the possibility of improving its conductivity. The chosen mesoporous material, the thermal stability of which was evaluated, was mixed with Li1.5Al0.5Ge1.5(PO4)3 by ball milling. The mesoporous material maintained a mesoporous structure after annealed at 950 °C and has hindered the grains growth of Li1.5Al0.5Ge1.5(PO4)3 by occupying the surfaces of the grains as evidenced by TEM analysis. Electrochemical impedance spectroscopy showed the participation of mesoporous materials had enhanced the conductivity by one order of magnitude. It was speculated that the thin layer of the mesoporous material, located on the surfaces of the grains, facilitated the migration of lithium ions across the boundaries.

Figure optionsDownload as PowerPoint slide