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<p>NASICON-type Li<sub>1.4</sub>Al<sub>0.4</sub>Ti<sub>1.6</sub>(PO<sub>4</sub>)<sub>3</sub> (LATP) solid-state electrolytes face key challenges including low ionic conductivity and severe interfacial instability with lithium metal. In this work, LiF was introduced as a sintering aid and dopant to simultaneously optimize the microstructure and electrochemical performance of LATP. XRD and SEM analyses confirm that 1-wt% LiF doping (LATP-F1) preserves the pure NASICON phase while significantly promoting grain growth and densification, achieving a high relative density of 95.2%. Electrochemical impedance spectroscopy reveals that LATP-F1 exhibits a room-temperature ionic conductivity of 3.04 × 10<sup>−4</sup> S·cm<sup>−1</sup> and an exceptionally low activation energy of 0.16&#xa0;eV, reflecting significantly reduced Li<sup>+</sup> migration barriers. Symmetric Li/LATP-F1/Li cells demonstrate stable Li plating/stripping with negligible voltage polarization over 100&#xa0;h, verifying suppressed Ti<sup>4+</sup> reduction and interfacial side reactions. Solid-state NCM811/LATP-F1/Li batteries maintain a high discharge capacity of ~ 140 mAh g<sup>−1</sup> with near-100% Coulombic efficiency over 150 cycles at 0.2 C, outperforming the undoped counterpart. These results demonstrate that moderate LiF doping is a facile and effective strategy to enhance both the bulk ionic conductivity and interfacial stability of LATP electrolytes, providing a promising pathway for high-performance solid-state lithium metal batteries.</p>

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LiF-assisted synthesis of NASICON-type Li1.3Al0.3Ti1.7(PO4)3 solid-state electrolyte toward high ionic conductivity

  • 期刊论文

  • 发表日期：

    2026年6月19日

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  • Zhongran Yao,
  • Fen Qi,
  • Qiang Sun,
  • Lin Ye,
  • Xiaowei Yang,
  • Guojie Chao,
  • Kongjun Zhu

摘要

NASICON-type Li1.4Al0.4Ti1.6(PO4)3 (LATP) solid-state electrolytes face key challenges including low ionic conductivity and severe interfacial instability with lithium metal. In this work, LiF was introduced as a sintering aid and dopant to simultaneously optimize the microstructure and electrochemical performance of LATP. XRD and SEM analyses confirm that 1-wt% LiF doping (LATP-F1) preserves the pure NASICON phase while significantly promoting grain growth and densification, achieving a high relative density of 95.2%. Electrochemical impedance spectroscopy reveals that LATP-F1 exhibits a room-temperature ionic conductivity of 3.04 × 10−4 S·cm−1 and an exceptionally low activation energy of 0.16 eV, reflecting significantly reduced Li+ migration barriers. Symmetric Li/LATP-F1/Li cells demonstrate stable Li plating/stripping with negligible voltage polarization over 100 h, verifying suppressed Ti4+ reduction and interfacial side reactions. Solid-state NCM811/LATP-F1/Li batteries maintain a high discharge capacity of ~ 140 mAh g−1 with near-100% Coulombic efficiency over 150 cycles at 0.2 C, outperforming the undoped counterpart. These results demonstrate that moderate LiF doping is a facile and effective strategy to enhance both the bulk ionic conductivity and interfacial stability of LATP electrolytes, providing a promising pathway for high-performance solid-state lithium metal batteries.