Composite polymer electrolyte (CPE) films with high room-temperature ionic conductivity are urgently needed for the practical application of high-safety solid-state batteries (SSBs). Here, a flexible polymer–polymer CPE thin film reinforced by a three-dimensional (3D) bacterial cellulose (BC) framework derived from natural BC hydrogel was prepared via the in-situ photo-polymerization method. The BC film was utilized as the supporting matrix to ensure high flexibility and mechanical strength. The BC–CPE attained a high room-temperature ionic conductivity of 1.3×10−4 S cm−1. The Li|BC–CPE|Li symmetric cell manifested stable cycles of more than 1200 h. The LCO|BC–CPE|Li full cell attained an initial discharge specific capacity of 128.7 mAh g−1 with 82.6% discharge capacity retention after 150 cycles at 0.2 C under room temperature. The proposed polymer-polymer CPE configuration represents a promising route for manufacturing environmental SSBs, especially since cellulose biomaterials are abundant in nature.
Silica fiber preform reinforced fused silica composites were fabricated with the variation of silica fiber content by repeated vacuum-assisted liquid-phase infiltrations. Flexural test was conducted to investigate the effect of silica fiber content and treatment temperature on the flexural strength of the 3D-SiO 2 /SiO 2 composite. Fracture behavior of the composites was investigated to study the relationship with the flexural property data. The flexural strength improved with the increment of silica fiber content and decreased with the increment of treatment temperature. The flexural strength of the composite showed the maximum value at 50vol% silica fiber content and treatment temperature at 700 o C. Fractography revealed that the composite was damaged by microdebonding at the fiber/matrix interface and the fracture of fiber.
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