Abstract
LAGP-PEO (LiTFSI) solid composite electrolyte were prepared with Lit(1.5), Al-0.5 Ge-1.5 (PO4) (3) (LAGP) and LiN (CF3 SO2) (2) (LiTFSI) as conductive components and poly (ethylene oxide) (PEO) as the binder using solution casting method. The molar ratio of EO/Li was 13 when the ratio of PEO to LAGP was varied. The role of LAGP and the transport mechanism of Li-ion in solid composite electrolyte were analyzed using electrochemical impedance spectroscopy and morphology techniques. The results showed that LAGP partially interacted to PEO (LiTFSI) and uniformly distributed in the electrolyte. With the increase of LAGP content, amorphous regions of PEO rises up to a maximum value due to the coordination interactions between LAGP and PEO (LiTFSI). Three phases are generally present, namely a pure crystalline LAGP phase, all amorphous complexion PEO (LiTFSI) phase and a transition phase consisting of lithium salt particles and amorphous PEO (LiTESI). The electrochemical impedance spectroscopy (EIS) showed that Li+