The preparation of NASICON-type solid electrolyte lithium-ion Li_(1+x)AlxGe_(0.2)Ti_(1.8-x)(PO4)3 by conventional solid-state method

摘要

NASICON-type lithium-ion conducting solid electrolyte for Li_(1+x)AlxGe_(0.2)Ti_(1.8-x)(PO4)3 were prepared with solid-state method at 900 °C for 7 h.In this paper,we have studied the property of Li_(1+x)AlxGe_(0.2)Ti_(1.8-x)(PO4)3 solid electrolyte systems with various numbers of Al replaced Ti.The highest total electrical conductivity of the sintered pellets for Li_(1.45)Al_(0.45)Ge_(0.2)Ti_(1.35)(PO4)3 at 25 °C was 1.0× 10~(-3)S/cm,which has NASICON-type crystalline structure without impurity phase.And the sintered pellet as x=0.45 in Li_(1+x)AlxGe_(0.2)Ti_(1.8-x)(PO4)3 systems also has highest relative density of 95.6% and highest three-point strength of 90 N mm~(-2),respectively.