3D perovskite LLTO nanotubers networks for enhanced Li + conductivity in composite solid electrolytes

Composite solid-state electrolytes (CSEs) with added ceramic fillers have become a representative structure that combines the advantages of organic and inorganic solid-state electrolytes, but have been challenged by particle clutter and aggregation that impairs Li + transport pathways and electrochemical performance. Herein, one-dimensional perovskite Li 0.33 La 0.557 TiO 3 nanotubes (LLTO NTs) were successfully synthesized by electrospinning. Pouring the mixed solution of the nanotubes with polyvinyl oxide (PEO) and lithium bisfluoromethyl sulfonate (LITFSI) to synthesize the LLTO NTs network enhanced 3D LLTO/PEO/LITFSI (PL + LLTO NTs) CSEs membranes. At the same time, it is also explored that the nanotubes are more uniformly dispersed in the polymer when the addition amount of LLTO NTs in the composite electrolyte is 15%. The Li + conductivity of CSEs improved from 1.72 × 10 −4 S/cm of the unfilled polymer electrolyte at 60 °C due to the three-dimensional (3D) fast Li + pathways provided by the nanotubes and polymer chains to 4.40 × 10 −4 S/cm. Meanwhile, the PL + 15LLTO NTs shows an enlarged electrochemical window of 5.16 V and high Li + transfer number (0.38 eV) compared with the electrolyte without filler. The results show that the prepared PL + 15LLTO NTs CSEs is a promising electrolyte candidate material for solid-state lithium batteries.