A Comparative Study on the Li⁺/Na⁺ Transportation in NASICON-Type Electrolytes

Abstract

With a high Li+/Na+ conductivity, NASICON-type oxide ceramic electrolyte has been regarded as one of the most promising electrolytes to replace liquid electrolytes and thus enable safer electrochemical devices. The present work analyses the factors that influence ionic migration in different NASICON-type oxide ceramic electrolytes. First, we use Li1.3Al0.3Ti1.7(PO4)3 as a representative material. The synthesis parameters are evaluated and optimized to guide the fabrication of electrolytes with high density and conductivity. Second, seven selected NASICON ceramic electrolytes are studied, and a direct connection between the Li+/Na+ ionic diffusion rates and the influence factors is established. Third, with experimental characteristics as proofs, nine interrelated influence factors are proposed to analyze their positive/negative influences on the Li+/Na+ transportation in NASICON-type ceramic electrolyte systems.