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<p>This work reports the preparation of N/S co-doped titanium dioxide (N/S-TiO<sub>2</sub>) via in-situ sulfur doping assisted by alkaline hydrolysis followed by subsequent nitrogen doping and the lithium storage application. TiCl<sub>4</sub> is used as the titanium source, and sodium sulfide (Na<sub>2</sub>S) solution provides the alkaline hydrolysis environment and sulfur source, thus enabling the synthesis of S doped anatase TiO<sub>2</sub> (S-TiO<sub>2</sub>). Urea is applied as the nitrogen source under high-temperature annealing, resulting in N/S co-doped anatase TiO<sub>2</sub> (N/S-TiO<sub>2</sub>) materials. In addition, oxygen vacancies, which might enhance the electronic/ionic conductivity, is created. Consequently, N/S-TiO<sub>2</sub> (10:1) exhibits excellent rate performance (85.6 mAh g<sup>− 1</sup> at 20&#xa0;C) and long-term cycling stability (116.22 mAh g<sup>− 1</sup> after 1500 cycles at 3&#xa0;C). Further analysis using cyclic voltammetry (CV), galvanostatic intermittent titration technique (GITT), and electrochemical impedance spectroscopy (EIS) shows an enhanced pseudocapacitive contribution, increased lithium-ion diffusion coefficient, and reduced charge transfer resistance. These findings provide new insights for developing high-performance, structurally tunable metal oxide anode materials.</p>

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Alkaline hydrolysis assisted preparation of N/S co-doped anatase TiO2 for high-performance lithium storage

  • 期刊论文

  • 发表日期：

    2026年7月13日

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  • Dong Shang,
  • Xiaocheng Ju,
  • Feiyang Jia,
  • Yuede Pan,
  • Naik Muhammad,
  • Guoli Zhang,
  • Zhewei Yang,
  • Gang Li,
  • Congwei Wang

摘要

This work reports the preparation of N/S co-doped titanium dioxide (N/S-TiO2) via in-situ sulfur doping assisted by alkaline hydrolysis followed by subsequent nitrogen doping and the lithium storage application. TiCl4 is used as the titanium source, and sodium sulfide (Na2S) solution provides the alkaline hydrolysis environment and sulfur source, thus enabling the synthesis of S doped anatase TiO2 (S-TiO2). Urea is applied as the nitrogen source under high-temperature annealing, resulting in N/S co-doped anatase TiO2 (N/S-TiO2) materials. In addition, oxygen vacancies, which might enhance the electronic/ionic conductivity, is created. Consequently, N/S-TiO2 (10:1) exhibits excellent rate performance (85.6 mAh g− 1 at 20 C) and long-term cycling stability (116.22 mAh g− 1 after 1500 cycles at 3 C). Further analysis using cyclic voltammetry (CV), galvanostatic intermittent titration technique (GITT), and electrochemical impedance spectroscopy (EIS) shows an enhanced pseudocapacitive contribution, increased lithium-ion diffusion coefficient, and reduced charge transfer resistance. These findings provide new insights for developing high-performance, structurally tunable metal oxide anode materials.