Hybrid solid electrolyte with the combination of LATP ceramic and PEO polymer by a solvent-free procedure

The development of excellent performance solid-state electrolytes (SSEs) is essential for high-energy solid-state lithium batteries . Herein, solid state composite electrolyte consisting of NASICON particles and PEO-LiTFSI was prepared through a solvent-free procedure. The assembled LFP / PEO-LATP / Li all-solid-state battery can present an initial capacity of 153.8 mA h g −1 and exhibit excellent electrochemical stability with a high capacity retention ratio of 95% after 100 cycles at 60 °C. In addition, a small amount of ionic liquid (IL) was added into hybrid solid electrolyte (HSE) to enhance the interface contact and improved the room temperature performance. Surprisingly, the assembled LFP / HSE / Li battery exhibits a stable discharge capacity of 157.6 mA h g −1 at 25 °C when the content of IL is 3%. The capacity retention can be reached 97.8% over 150 cycles at 60 °C. All the results show that assembled cells with HSE revealed an improved electrochemical performance .