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<p>With the aim of suppressing the harmful phase transition of LiCoO<sub>2</sub> (LCO) at high voltage of 4.6&#xa0;V, a simple two-step solid-phase calcination method was applied to prepare F-doped LCO materials. LCO materials with different F doping concentrations were synthesized by Co<sub>3</sub>O<sub>4</sub> and Li<sub>2</sub>CO<sub>3</sub> as starting reagents in the addition of NH<sub>4</sub>F. F doping allows F to partially replace the lattice oxygen sites in the LCO and stabilize the structure of the LCO material. Compared with bare LCO, the F-doped LCO exhibits better electrochemical performance. Among the electrodes, the LCO-F-2% configuration achieves the best electrochemical performance. The initial discharge specific capacity of LCO-F-2% is 210.77&#xa0;mAh&#xa0;g<sup>−1</sup> in the voltage range of 3.0−4.6&#xa0;V at 0.5&#xa0;C, with capacity retention of 60% for 200&#xa0;cycles. In addition, the rate performance of the LCO-F-2% electrode is significantly improved. This work provides a useful strategy for the development and utilization of long-life high-voltage LCO materials.</p>

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The Effect of F-Doping on the Electrochemical Performance of LiCoO2 at 4.6 V

  • 期刊论文

  • 发表日期：

    2026年8月3日

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  • Yixuan Li,
  • Weilong Hu,
  • Hao Zhang,
  • Junxuan Zhou,
  • Yuanqing Zhang,
  • Shiquan Wang,
  • Ru’an Chi,
  • Lin Li

摘要

With the aim of suppressing the harmful phase transition of LiCoO2 (LCO) at high voltage of 4.6 V, a simple two-step solid-phase calcination method was applied to prepare F-doped LCO materials. LCO materials with different F doping concentrations were synthesized by Co3O4 and Li2CO3 as starting reagents in the addition of NH4F. F doping allows F to partially replace the lattice oxygen sites in the LCO and stabilize the structure of the LCO material. Compared with bare LCO, the F-doped LCO exhibits better electrochemical performance. Among the electrodes, the LCO-F-2% configuration achieves the best electrochemical performance. The initial discharge specific capacity of LCO-F-2% is 210.77 mAh g−1 in the voltage range of 3.0−4.6 V at 0.5 C, with capacity retention of 60% for 200 cycles. In addition, the rate performance of the LCO-F-2% electrode is significantly improved. This work provides a useful strategy for the development and utilization of long-life high-voltage LCO materials.