The sodium super-ionic conductor (NASICON)-type solid-state electrolyte Li_1.4Al_0.4Ti_1.6(PO₄)₃ (LATP) is an attractive alternative to liquid electrolytes for lithium batteries. The rapid development of LATP, however, is hindered by its poor interfacial compatibilities against the Li metal. Herein, a flexible membrane coating layer consisting of Mg₃N₂ and PVDF has been adopted to modify LATP via a simple drop-casting method. A multifunctional interlayer with Mg, LiF and Li₃N is in situ constructed by the reaction of the coating layer with the Li metal. The decomposition of LATP has been restrained and interfacial ionic transport kinetics has been improved with the modification. Benefitting from the multifunctional interlayer, the critical current density of LATP is improved from 0.34 mA cm⁻² to 0.76 mA cm⁻². The symmetric cells assembled with the modified LATP exhibit a stable cycle for more than 1000 h at 0.20 mA cm⁻², and the Li/LiFePO₄ cells after modification have a capacity retention of 80% after 385 cycles at 2C. The present work demonstrates a promising strategy for fine interfacial stability tuning and low-impedance LATP.

中文翻译：

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用原位构建的多功能夹层稳定 Li1.4Al0.4Ti1.6(PO4)3/Li 界面，用于高能量密度电池

钠超离子导体 (NASICON) 型固态电解质 Li _1.4 Al _0.4 Ti _1.6 (PO ₄ ) ₃ (LATP) 是一种极具吸引力的锂电池液态电解质替代品。然而，LATP 的快速发展受到其与锂金属较差的界面相容性的阻碍。_{在此，采用由 Mg 3} N ₂和 PVDF组成的柔性膜涂层，通过简单的滴铸法对 LATP 进行改性。原位具有 Mg、LiF 和 Li ₃ N的多功能中间层通过涂层与锂金属的反应构建。通过改性，LATP 的分解受到抑制，界面离子传输动力学得到改善。受益于多功能夹层，LATP的临界电流密度从0.34 mA cm ^-2提高到0.76 mA cm ^-2。^{用改性LATP组装的对称电池在0.20 mA cm -2}下表现出超过1000小时的稳定循环，改性后的Li/LiFePO ₄电池在2C下385次循环后容量保持率为80%。目前的工作展示了一种用于精细界面稳定性调整和低阻抗 LATP 的有前途的策略。