Enhancing Li-ion conduction in composite polymer electrolytes using Li0.33La0.56TiO3 nanotubes

Abstract

Here, a poly(vinylidene fluoride) (PVDF)-based composite polymer electrolyte (CPE) with a unique Li_0.33La_0.56TiO₃ (LLTO) nanotube filler, which shows a high Li-ion conductivity, is reported. Compared with LLTO nanoparticles (NPs) and nanowires (NWs), the LLTO nanotube fillers increase the interfacial area between PVDF and the LLTO filler, leading to the simple transportation of Li-ions through these interfacial pathways. In addition, the Li plating and stripping cycling performance of the CPEs is improved to 205 h at 0.1 mA cm⁻², and the performance of the Li|CPEs|LiFePO₄ cells also achieves a discharge capacity of 120 mA h g⁻¹ after 100 cycles at 0.5C at room temperature. These results demonstrate an effective interfacial strategy for the design of high Li-ion conduction CPEs for all solid-state batteries.