固态电解质湿法PE挤出隔膜的应用研究OA

To meet the performance requirements of next-generation commercial batteries and overcome the limitations of traditional wet-processed polyethylene(PE)separators,such as low ionic conductivity,low porosity,poor electrolyte affinity,and inadequate wettability,this study introduces the solid-state electrolyte lithium aluminum titanium phosphate(LATP)as an extrusion additive to enhance the performance of commercially available wet-processed PE separators.A solid-state electrolyte-PE composite membrane was successfully fabricated,and a practical fabrication process with specific processing parameters is presented.The effects of different LATP loadings(20％and 50％)on the properties of the composite separator were systematically investigated.The optimal performance was achieved at a LATP loading of 20％.The results indicate that,at a 20％LATP loading,the porosity of the separator increased from 45.74％for the pure PE membrane to 55.84％for the composite membrane.Microscopic characterization revealed large pore sizes and the presence of distinct LATP particles within the cross-section of the separator.Furthermore,the electrolyte wettability of the separator was significantly improved,with the contact angle decreasing from 40.4° to 34.1° and the electrolyte uptake increasing from 80％to 105％,demonstrating enhanced physicochemical properties.Additionally,ionic conductivity measurements and electrochemical evaluations were conducted on both the pure PE membrane and the composite membrane.The results showed that the ionic conductivity of the composite membrane increased from 0.897 mS/cm for the pure PE membrane to 2.137 mS/cm.Moreover,coin cells assembled with the composite membrane exhibited lower resistivity,longer cycle life,and superior rate capability.