Study of the Lithium Ion Transfer Mechanism in Composite Electrolyte By Solid State Li NMR

Abstract

Ceramic-polymer composite electrolytes promised to provide high conductivity with certain flexibility, while the inherent differences of ceramic and polymer electrolyte made the lithium ion transfer mechanism in composite electrolyte controversial. In this work, we fabricated composite electrolyte of Li10GeP2S12 (LGPS) and polyethylene oxide (PEO) within different composition, the ionic conductivity and electrochemical performance were compared and studied. By applying high-resolution solid-state Li NMR, the lithium ion pathway in these composite electrolytes can be tracked to reveal the ionic transport mechanism. This study can provide insights in compositional design of the composite electrolyte for applying in all solid state batteries.