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<p>To meet the development demands of high-energy-density, long-cycle-life lithium-ion batteries, this study focuses on the development of high-performance electrolyte additives, and has successfully synthesized and systematically characterized a novel lithium salt additive lithium tetrafluorophosphate (LiPOF<sub>4</sub>). By optimizing the reaction process between silicon tetrafluoride (SiF<sub>4</sub>) and phosphorus pentoxide (P<sub>2</sub>O<sub>5</sub>), the critical intermediate phosphorus trifluoride (POF<sub>3</sub>) was successfully prepared using the gas-phase contact method, which was then reacted with lithium fluoride (LiF) to synthesize LiPOF<sub>4</sub>. SEM and TEM results showed that the obtained LiPOF<sub>4</sub> was predominantly amorphous in nature. Thermogravimetric analysis confirmed that the material exhibits excellent thermal stability, with a significant decomposition temperature of 310&#xa0;°C. Electrochemical testing revealed that adding 10 wt% LiPOF<sub>4</sub> to the electrolyte significantly enhances the performance of lithium-sulfur batteries: after 100 cycles at a 0.5&#xa0;C rate, the coulombic efficiency was 83.7% (compared to 77.1% for the control group), the charge specific capacity was 594.7 mAh/g (control group: 534.7 mAh/g), and the discharge specific capacity was 755.1 mAh/g (control group: 697.4 mAh/g). Additionally, the addition of LiPOF<sub>4</sub> effectively extended the charge-discharge plateau of the lithium-sulfur battery. This work provides new materials and new ideas for improving electrolyte performance.</p>

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Optimized synthesis of novel LiPOF4 electrolyte additives and their application in lithium-sulfur batteries

  • 期刊论文

  • 发表日期：

    2025年12月2日

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  • Tao Liu,
  • Shiyun Tang,
  • Anjiang Tang,
  • Junjiang Guo,
  • Deju Wei,
  • Chuanhang Hu

摘要

To meet the development demands of high-energy-density, long-cycle-life lithium-ion batteries, this study focuses on the development of high-performance electrolyte additives, and has successfully synthesized and systematically characterized a novel lithium salt additive lithium tetrafluorophosphate (LiPOF4). By optimizing the reaction process between silicon tetrafluoride (SiF4) and phosphorus pentoxide (P2O5), the critical intermediate phosphorus trifluoride (POF3) was successfully prepared using the gas-phase contact method, which was then reacted with lithium fluoride (LiF) to synthesize LiPOF4. SEM and TEM results showed that the obtained LiPOF4 was predominantly amorphous in nature. Thermogravimetric analysis confirmed that the material exhibits excellent thermal stability, with a significant decomposition temperature of 310 °C. Electrochemical testing revealed that adding 10 wt% LiPOF4 to the electrolyte significantly enhances the performance of lithium-sulfur batteries: after 100 cycles at a 0.5 C rate, the coulombic efficiency was 83.7% (compared to 77.1% for the control group), the charge specific capacity was 594.7 mAh/g (control group: 534.7 mAh/g), and the discharge specific capacity was 755.1 mAh/g (control group: 697.4 mAh/g). Additionally, the addition of LiPOF4 effectively extended the charge-discharge plateau of the lithium-sulfur battery. This work provides new materials and new ideas for improving electrolyte performance.