Structure and electric conductivity in lithium-chloro-phosphotungstate glasses

Abstract

Designing Solid-State Electrolytes (SSEs) exhibiting high ionic conductivity and high mechanical/thermal stability is the main concern for developing next-generation rechargeable batteries. Here we present the successful synthesis of colorless, transparent, and bubble-free phosphate glasses with high lithium-ion electrical conductivity within the system xLiCl–(1–x)(63Li2WO4–37P2O5) with 0 ≤ x ≤ 30 mol%. The structural study is performed using Raman spectroscopy. Electrical conductivity measurements of the glasses are investigated over a large frequency range at various temperatures using impedance spectroscopy. It is found that the electric conductivity increases with increasing lithium chloride content. The dc conductivity reaches 2.76 × 10−6 (Ω−1.cm−1) at room temperature (RT) for the glass (x = 30 mol%). The frequency dependence of the conductivity is investigated and the scaling of the conductivity spectra shows that the conduction mechanism in the glasses is both temperature and composition-independent.