Fabrication of porous LLZO solid electrolyte based on modified kapok fiber

As one of the most promising solid electrolytes, Li 7 La 3 Zr 2 O 12 (LLZO) has received great attention in the field of all solid-state lithium-ion batteries. However, LLZO, as a solid material, has far less contact with the electrode than original liquid electrolyte with wettable properties in practical applications. In this study, porous LLZO solid electrolytes were fabricated by both mechanical and dispersive mixing methods with modified kapok fibers as pore-forming agents. The results show that the pores of LLZO prepared by dispersive mixing are more homogeneous than that prepared by mechanical mixing, and the ionic conductivity of LLZO fabricated by dispersive mixing remains in the same order of magnitude as the ionic conductivity of the original LLZO solid electrolyte. At the same time, the formation of ordered pore channels for porous LLZO is conducive to increasing the contact area between the solid electrolyte and the electrode material, which lays a foundation for reducing the impedance of solid electrolyte.