Effects of Heat Treatment and Additive LiF on the Properties of Solid‐State Electrolyte of Li1.5Al0.5Ge1.5(PO4)3. Issue 2 (1st November 2020)

• Record Type: Journal Article
• Authors: Lv, Jinhang; Zheng, Ruilin; Lv, Peng; Wei, Wei
• Other Names: Wu Yuping guestEditor.; Zhu Yusong guestEditor.; Shi Feifei guestEditor.
• Is Part Of: Energy & environmental materials. Volume 4:Issue 2(2021)
• Page Start: 208
• Page End: 212
• Publication Date: 2020-11-01
• Subjects: glass ceramics -- grain boundary -- ionic conductivity -- LAGP -- solid‐state electrolytes; Power resources -- Environmental aspects -- Periodicals; Renewable energy sources -- Periodicals; Environmental engineering -- Periodicals; 333.79
• DOI: 10.1002/eem2.12115
• Languages: English
• ISSNs: 2575-0356

Abstract

Abstract : A solid electrolyte of LAGP [Li1.5 Al0.5 Ge1.5 (PO4 )3 ] contained 0.5 wt% LiF was prepared by using low‐volatile raw materials. The effects of different heat treatment conditions (750–900 °C, 4–10 h) and additive (LiF) on the ionic conductivity, structural morphology, and crystal transformation process were investigated in detail. EIS (electrochemical impedance spectroscopies) showed that the ionic conductivity of LAGP contained 0.5 wt% LiF had a highest value of 3.17 × 10 −4 S cm −1 with low activation energy (0.31 eV) after treating 825 °C for 6 h, more than LAGP of 2.45 × 10 −4 S cm −1 . DSC analysis and SEM images indicated that adding a small amount of LiF to LAGP not only can lower the glass transition temperature (from 513 °C to 507 °C) and crystallization temperature (from 622 °C to 605 °C), but also can modify the grain boundary and increase the relative density of LAGP (from 95.8% to 97.7%). Abstract : The solid electrolyte of Li1.5 Al0.5 Ge1.5 (PO4 )3 (LAGP) added with LiF using nonvolatile raw materials has been prepared by melting quenching method. The effects of heat treatment conditions and additive LiF on its properties are studied. The results show that additive LiF improves its ionic conductivity and relative density.