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<p>Nano-scale CuF<sub>2</sub> with superior electrochemical activity was successfully prepared by a mixed solvent co-precipitation method. The SEM and TEM analyses demonstrated that the methanol concentration had a pronounced effect on both the particle size and the extent of agglomeration. With the increase in methanol content, the particle size and agglomeration of CuF<sub>2</sub> decreased first and then increased. When the volume ratio of methanol to deionized water was 1:1, the CuF<sub>2</sub> particles exhibited the smallest size and the lowest degree of agglomeration. CuF<sub>2</sub> synthesized with 50% methanol exhibited superior electrochemical performances with a voltage plateau above 3 V and a 1st discharge capacity of 525.8 mAh·g<sup>−1</sup> at 0.01 C due to the synergistic influence of the particle size and dispersion. The analysis results using electrochemical impedance spectroscopy (EIS) and constant current intermittent titration technique (GITT) affirmed the addition of methanol was beneficial for promoting Li<sup>+</sup> diffusion and accelerating electrochemical reaction kinetics of CuF<sub>2</sub>.</p>

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Synthesis of Nano-CuF2 with Superior Electrochemical Performances via a Mixed Solvent Coprecipitation Method

  • 期刊论文

  • 发表日期：

    2025年10月29日

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  • Suni Du,
  • Zhiyong Yu,
  • Erte Ji,
  • Hanchen Xu,
  • Yichun Zhao,
  • Hanxing Liu,
  • Caiting Lai,
  • Zhongzhi Yuan

摘要

Nano-scale CuF2 with superior electrochemical activity was successfully prepared by a mixed solvent co-precipitation method. The SEM and TEM analyses demonstrated that the methanol concentration had a pronounced effect on both the particle size and the extent of agglomeration. With the increase in methanol content, the particle size and agglomeration of CuF2 decreased first and then increased. When the volume ratio of methanol to deionized water was 1:1, the CuF2 particles exhibited the smallest size and the lowest degree of agglomeration. CuF2 synthesized with 50% methanol exhibited superior electrochemical performances with a voltage plateau above 3 V and a 1st discharge capacity of 525.8 mAh·g−1 at 0.01 C due to the synergistic influence of the particle size and dispersion. The analysis results using electrochemical impedance spectroscopy (EIS) and constant current intermittent titration technique (GITT) affirmed the addition of methanol was beneficial for promoting Li+ diffusion and accelerating electrochemical reaction kinetics of CuF2.