Scholarlink

<p>Lithium niobate (LiNbO<sub>3</sub>) has emerged as a promising solid-state electrolyte for energy storage systems owing to its favorable ionic conductivity and distinctive physicochemical properties. However, conventional solution-based synthesis routes are limited by Li loss, compromising performance. This study reports for the first time the development of Li–Nb–O thin films using reactive magnetron co-sputtering of Nb and Li targets at various DC powers and constant RF power. This approach yields the growth of amorphous films at room temperature, as confirmed by X-ray diffraction. Morphological studies revealed that increasing DC power promotes grain growth. EDX analysis indicated a rise in Nb/O atomic ratio from 0.28 to 0.44 with increasing DC power (20–80&#xa0;W). XPS experiments provided evidence supporting the dominant presence of Nb-oxygen bonds and a growing contribution from weakly bound Li species at higher Nb concentrations. Moreover, the Li-to-Nb atomic ratio was found to range from 2.31 to 1.36 with increasing DC power (20–80&#xa0;W), corroborating the formation of a Li-rich compositional region. Temperature-dependent impedance spectroscopy demonstrated enhanced ionic diffusion in Li–Nb–O films with higher Nb content, attributed to a reduction in activation energy. The highest room-temperature ionic conductivity of co-sputtered films reached 1.33 × 10<sup>−7</sup>&#xa0;S cm<sup>−1</sup>. Metal–insulator-metal capacitors based on the optimized Li–Nb–O thin films exhibited a high capacitance (~ 624.86&#xa0;nF cm<sup>−2</sup>), a large dielectric constant (~ 141.21), and a low loss tangent. In this way, a electric double layer was formed at the electrolyte/electrode interfaces. These findings underscore the potential of reactive co-sputtered Li–Nb–O films as solid-state electrolytes for energy/charge storage applications.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Reactive co-sputtered Li–Nb–O thin films with tunable ionic conductivity and dielectric properties for energy storage applications

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2025年10月29日

查看全文
  • Samaneh Jafarpour,
  • Hamid Naghshara,
  • Hamaneh Zarenezhad

摘要

Lithium niobate (LiNbO3) has emerged as a promising solid-state electrolyte for energy storage systems owing to its favorable ionic conductivity and distinctive physicochemical properties. However, conventional solution-based synthesis routes are limited by Li loss, compromising performance. This study reports for the first time the development of Li–Nb–O thin films using reactive magnetron co-sputtering of Nb and Li targets at various DC powers and constant RF power. This approach yields the growth of amorphous films at room temperature, as confirmed by X-ray diffraction. Morphological studies revealed that increasing DC power promotes grain growth. EDX analysis indicated a rise in Nb/O atomic ratio from 0.28 to 0.44 with increasing DC power (20–80 W). XPS experiments provided evidence supporting the dominant presence of Nb-oxygen bonds and a growing contribution from weakly bound Li species at higher Nb concentrations. Moreover, the Li-to-Nb atomic ratio was found to range from 2.31 to 1.36 with increasing DC power (20–80 W), corroborating the formation of a Li-rich compositional region. Temperature-dependent impedance spectroscopy demonstrated enhanced ionic diffusion in Li–Nb–O films with higher Nb content, attributed to a reduction in activation energy. The highest room-temperature ionic conductivity of co-sputtered films reached 1.33 × 10−7 S cm−1. Metal–insulator-metal capacitors based on the optimized Li–Nb–O thin films exhibited a high capacitance (~ 624.86 nF cm−2), a large dielectric constant (~ 141.21), and a low loss tangent. In this way, a electric double layer was formed at the electrolyte/electrode interfaces. These findings underscore the potential of reactive co-sputtered Li–Nb–O films as solid-state electrolytes for energy/charge storage applications.