Electrochemical stability of a NASICON solid electrolyte from the lithium aluminum germanium phosphate (LAGP) series

• Published in: Solid state ionics Vol. 378; p. 115888
• Main Authors: Zallocco, Vinicius Martins, Freitas, Jhonys Machado, Bocchi, Nerilso, Rodrigues, Ana Candida Martins
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 01.05.2022; Elsevier BV
• Subjects: Aluminum; Batteries; Carbon; Ceramics; Crystallization; Electrochemical window; Germanium; Glass ceramics; Heat treatment; Ion currents; LAGP; Lithium; NASICON, glass-ceramic; Sintering (powder metallurgy); Solid electrolyte; Solid electrolytes; Stability; Voltammetry; LAGP; NASICON, glass-ceramic; Electrochemical window; Solid electrolyte
• ISSN: 0167-2738; 1872-7689
• DOI: 10.1016/j.ssi.2022.115888

Li1.5Al0.5Ge1.5(PO4)3 glass-ceramics from NASICON series was synthesized using two different methods: single heat treatment and glass sintering with concurrent crystallization of a pressed pellet, which exhibit ionic conductivity of 4.15 × 10−4 S cm−1. The electrochemical stability window was investigated by cyclic voltammetry, utilizing a mixture of powder solid electrolyte, carbon, and binder as the working electrode, resulting in the Li/LAGP/LAGP+C/Au configuration. As a comparison, conventional set-up for cyclic voltammetry was also used, resulting in the Li/LAGP/Au setup. An electrochemical stability window around 3.5 V was found. •Electrochemical stability window of NASICON Lithium – aluminum – germanium – phosphate (x = 0,5).•Sintering with concurrent crystallization of glass pellets with subsequent crystallization.•Anodic and cathodic limits vary depending on working electrode configuration.•Conventional and modified cyclic voltammetry of LAGP.