以无机固体电解质Li_1.3Al_0.3Ti_1.7（PO₄）₃（LATP）为涂覆材料，采用简单刮刀涂覆法在商用PE隔膜表面均匀涂覆功能化涂层。利用扫描电子显微镜、循环伏安、交流阻抗、恒电流充放电等测试方法对涂层隔膜的热稳定性、吸液性、保液性、表面形貌、电化学性能进行表征，研究LATP/PE涂层隔膜性能。结果表明，与商用7 μm PE隔膜相比，LATP/PE涂层隔膜的孔隙率、热稳定性和吸液率等指标均有大幅度改善。LATP/PE涂层隔膜为23 μm （L₂样品）时具备最佳的电化学性能，扣式电池在0.1 C倍率下的首次放电比容量为162.79 mAh/g，在1 C倍率下循环100圈后容量保持率为120%。软包锂离子电池在1 C的电流密度下循环100圈后容量保持率为74.12%。

Li_1.3Al_0.3Ti_1.7(PO₄)₃ (LATP), a kind of inorganic solid electrolyte, is applied as a functional coating on the surface of commercial polyethylene (PE) separators through common scraper-coating method.A series of characterization analysis, such as scanning electron microscopy, cyclic voltammetry, AC impedance and galvanostatic charge-discharge, etc.are utilized to evaluate the thermal stability, liquid absorption, liquid retention, surface morphology and electrochemical performance of the coated separator.The performance of LATP/PE coated separator with different thickness is further explored.Compared with the commercial 7 μm PE separator, the porosity, thermal stability and liquid absorption rate of the obtained coated separator are significantly improved.LATP/PE coated separator with a thickness of 23 μm (L2 sample) exhibits the best electrochemical performance, and the coin-cell assembled with this separator shows an initial discharge specific capacity of 162.79 mAh·g^-1 at 0.1 C and a capacity retention rate of 120% after 100 cycles at 1 C.The soft pack lithium-ion battery with such a separator delivers a capacity retention of 74.12% after 100 cycles at 1C.

李涛(1997-),男,硕士生,研究方向为新能源材料与器件,774336721@qq.com。