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.

KEYWORDS:

• Phosphate
• glasses
• structure
• electric properties
• ionic conductivity

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Funding

The authors would like to thank the CNRST (Morocco) for the financial support of this work through PPR program (Project: Energyphos).