NASICON-Type Li1+xAlxZryTi2?x?y(PO4)3 Solid Electrolytes: Effect of Al, Zr Co-Doping and Synthesis Method

Replacing liquid electrolytes with solid-state conductors is one of the key challenges to increasing safety and energy density next-generation Li secondary batteries. In this work, NASICON-type Li1+xAlxZryTi2?x?y(PO4)3 0 ? x, y 0.2 solid were synthesized using sol-gel techniques at various sintering temperatures (800, 900, 1000 °C). Their morphology conducting properties studied determine optimal dopant content synthesis method. Li1.2Al0.2Zr0.1Ti1.7(PO4)3 Li1.1Al0.1Zr0.2Ti1.7(PO4)3 prepared 900 °C a reaction exhibit highest total conductivity 25 (7.9 × 10?4 5.4 S cm?1, respectively), which due size lithium transport channels, as well high these samples. The potential profile Li|Li1.2Al0.2Zr0.1Ti1.7(PO4)3|Li cells was retained during cycling current 0.05 mA cm?2 for 100 h, indicating interfacial metal/electrolyte stability.