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<p>Solid-state electrolytes (SSEs) have attracted much attention due to their high safety and cycling stability for lithium-ion batteries. However, the high interface impedance between the electrode and the solid-state electrolyte hinders their practical application. In this work, the solid-liquid hybrid electrolyte S-Li<sub>1.3</sub>Al<sub>0.3</sub>Ti<sub>1.7</sub>(PO<sub>4</sub>)<sub>3</sub>-LE05(S-LATP-LE05) (LATP: Li<sub>1.5</sub>Al<sub>0.5</sub>Ti<sub>1.5</sub> (PO<sub>4</sub>)<sub>3</sub>) sheet is prepared by dropping liquid electrolyte (LE) with appropriate FeF<sub>2</sub> into spark plasma sintering S-LATP (solid-liquid hybrid electrolyte), which shows high-density and high-ionic-conductivity (5.78×10<sup>−4</sup> S/cm). When the amount of FeF<sub>2</sub> is 0.5 wt%, the interfacial properties between the anode and electrolyte are improved, and the S-LATP is well protected by LiF-rich (solid electrolyte interface) (SEI) interface in cycling process. The Li∣S-LATP-LE05∣Li symmetric battery and full battery show better electrochemical performance and stability relatively. The overpotential of the Li∣S-LATP-LE05∣Li symmetric battery is smaller and shows more stable electrochemical performance after cycling for 350 h, revealing good compatibility with a lithium metal anode and can inhibit the growth of lithium dendrites effectively. The Li∣S-LATP-LE05∣LiFePO<sub>4</sub> full battery delivers a specific discharge capacity of 160 mA·h/g at 0.2<i>C</i> for 50 cycles. The corresponding coulombic efficiency is about 99.9% and displays better rate performance compared with the battery without FeF<sub>2</sub> LE.</p>

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Appropriate FeF2 enhancing interface stability of lithium battery with solid-liquid hybrid electrolyte

  • 期刊论文

  • 发表日期：

    2025年10月1日

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  • Yi-ting Tong,
  • Zhuo-jie Li,
  • Quan Pei,
  • Qing-feng Zhang,
  • Shu-hong Xie,
  • Jing Chen

摘要

Solid-state electrolytes (SSEs) have attracted much attention due to their high safety and cycling stability for lithium-ion batteries. However, the high interface impedance between the electrode and the solid-state electrolyte hinders their practical application. In this work, the solid-liquid hybrid electrolyte S-Li1.3Al0.3Ti1.7(PO4)3-LE05(S-LATP-LE05) (LATP: Li1.5Al0.5Ti1.5 (PO4)3) sheet is prepared by dropping liquid electrolyte (LE) with appropriate FeF2 into spark plasma sintering S-LATP (solid-liquid hybrid electrolyte), which shows high-density and high-ionic-conductivity (5.78×10−4 S/cm). When the amount of FeF2 is 0.5 wt%, the interfacial properties between the anode and electrolyte are improved, and the S-LATP is well protected by LiF-rich (solid electrolyte interface) (SEI) interface in cycling process. The Li∣S-LATP-LE05∣Li symmetric battery and full battery show better electrochemical performance and stability relatively. The overpotential of the Li∣S-LATP-LE05∣Li symmetric battery is smaller and shows more stable electrochemical performance after cycling for 350 h, revealing good compatibility with a lithium metal anode and can inhibit the growth of lithium dendrites effectively. The Li∣S-LATP-LE05∣LiFePO4 full battery delivers a specific discharge capacity of 160 mA·h/g at 0.2C for 50 cycles. The corresponding coulombic efficiency is about 99.9% and displays better rate performance compared with the battery without FeF2 LE.