The increasing demand for safe and high-energy-density battery systems has led to intense research into solid electrolytes for rechargeable batteries. One of these solid electrolytes is the NASICON-type Li_1+xAl_xTi_2−x(PO₄)₃ (LATP) material. In this study, different boron compounds (10% B₂O₃ doped, 10% H₃BO₃ doped, and 5% B₂O₃ + 5% H₃BO₃ doped) were doped at total 10 wt.% into the Ti⁴⁺ sites of an LATP solid electrolyte to investigate the structural properties and ionic conductivity of solid electrolytes using the solid-state synthesis method. Characterization of the synthesized samples was conducted using X-ray diffraction (XRD), Raman spectroscopy, scanning electron microscopy (SEM), and electrochemical impedance spectroscopy (EIS). The XRD patterns of the boron-doped LATP (LABTP) samples show that the samples have a rhombohedral phase with space group R$\overline{3}$c together and low amounts of impurity phases. While all the LABTP samples exhibited similar ionic conductivity values of around 10⁻⁴ S cm⁻¹, the LABTP2 sample doped with 10 wt.% H₃BO₃ demonstrated the highest ionic conductivity. These findings suggest that varying B³⁺ ion doping strategies in LATP can significantly advance the development of solid electrolytes for all-solid-state lithium-ion batteries.

Bu çalışmada, %10 indiyum katkılı LiAlTi(PO4)3 (LATP) katı elektrolitinin iyonik iletkenliği incelenmiştir. Daha büyük iyonik yarıçapıyla indiyum katkısının kafes hacmini artıracağı ve böylece iyonik iletkenliği geliştireceği varsayılmıştır. Arayüzey gerilimlerinin neden olduğu yüksek iç dirençlerle ilgili sorunları hafifletmek için malzeme ve üretim faktörlerini dengelemek için çaba sarf edilmiştir. Sentezlenen LiAlInTi(PO4)3 (LAITP) katı elektrolit, sırasıyla X-ışını kırınımı (XRD), taramalı elektron mikroskobu (SEM) ve elektrokimyasal empedans spektroskopisi (EIS) kullanılarak kristal yapısı, morfolojik özellikleri ve Li+ iyon iletkenliği açısından karakterize edilmiştir. Sonuçlar, indiyum katkısının LATP'nin iyonik iletkenliğini önemli ölçüde geliştirdiğini ve gelişmiş enerji depolama uygulamaları için potansiyelini vurguladığını göstermiştir.

This study investigates the potential of LAITP/PVDF composite electrolytes to improve the safety and performance of lithium-ion batteries. The study focuses on the synthesis and characterization of composite solid electrolyte consisting of indium-doped lithium aluminum titanium phosphate (LAITP) ceramic material and LiClO4 salt with polyvinylidene fluoride (PVDF) as the polymer matrix. The LAITP ceramic, synthesized via solid-state synthesis, demonstrates high ionic conductivity, thermal stability, and mechanical robustness. PVDF provides electrochemical and thermal stability to the composite. The composite electrolytes were prepared by integrating LAITP into the PVDF matrix through the solution casting method. Various characterization methods were employed to assess the properties of the resulting composite. X-ray diffraction (XRD) was used to examine the crystal structure, while scanning electron microscopy (SEM) provided insights into the morphological features. Ionic conductivity measurements were conducted using electrochemical impedance spectroscopy (EIS), enabling an evaluation of the composite's electrochemical performance. The LAITP-reinforced PVDF-based composite solid electrolyte exhibited an ionic conductivity of 1.7 × 10⁻5 S cm⁻1 at room temperature.