Development of solid-state electrolyte for using fast lithium ion conducting inorganic material in solid-state lithium metal batteries (SSLMBs)

Abstract

All solid-state lithium-ion batteries (ASSLBs) have the capacity to fulfil the energy demand particularly for upcoming electric vehicle (EV) technology due to their high energy and power densities and safety. However, the technological success of ASSLBs heavily relies on developing fast lithium-ion conducting electrolyte materials the most critical component in terms of designing ASSLBs. In the present research, an attempt has been made to develop highly sintered LATP [Li1+xAlxTi2-x(PO4)3] based material for its application as solid electrolyte in all solid-state lithium batteries. LATP has been widely researched as solid-state electrolyte material due to its fast lithium ionic conductivity (10-5-10-6 S/cm), wide potential window (0-6V) and high mechanical strength. Here, I have synthesized LATP material using solid-state synthesis method which is a top-down synthesis method and using XRD, FESEM, Archimedes principle (for density calculation of the sintered pellet of LATP), FTIR, TG-DTA for characterization studies and electrochemical studies include EIS (obtained result 10-4 S/cm) at AutoLab . Charge discharge for both symmetric cell against Li-foil at ARBIN. We identified the interface stability of the material against Lithium metal which makes it a challenge for commercial use of the material in solid-state batteries. This has resulted in decrease in the interfacial resistance both at room temperature and at varied temperature from (30o-120o) C. We have also studied the calendaring effect of the cell with LATP as solid- state electrolyte and lithium foil as on both side to check the stability and any chemical reaction occurring if exposed to atmospheric condition for long time.