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 Li0.33La0.557TiO3 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 x 10(-4) S/cm of the unfilled polymer electrolyte at 60 degrees C due to the three-dimensional (3D) fast Li+ pathways provided by the nanotubes and polymer chains to 4.40 x 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.

Automated summary

In this study, one-dimensional perovskite nanotubes were successfully synthesized and added into the composite electrolyte. The results showed that the nanotubes and polymer chains provided 3D fast Li+ transport pathways, leading to significantly improved Li+ conductivity of the electrolyte. Moreover, an enlarged electrochemical window and higher Li+ transfer number were achieved compared to the electrolyte without filler.