Preparation and characterization of PAN-LATP composite solid-state electrolyte

Abstract

Compared with the traditional liquid electrolyte, the solid polymer electrolyte can significantly improve the safety and energy density of the lithium secondary batteries, but its room temperature lithium ion conductivity is low and the mechanical properties are relatively poor. These problems limit the application of solid polymer electrolytes in lithium secondary batteries. In order to solve the above problems, PAN-LATP composite solid electrolyte (CSE) was prepared by solution casting method in polyacrylonitrile (PAN) polymer electrolyte to introduce inorganic solid-state electric Li1.3Al0.3Ti1.7(PO4)3 (LATP). The composite solid electrolyte not only has higher lithium ion conductivity, but also broadens the electrochemical stability window of the solid polymer electrolyte. When the LATP content was 15%, the CSE has the highest lithium ion conductivity, which was 2.14×10−5 S/cm at room temperature and 3.03×10−4 S/cm at 333 K. At the same time, the mechanical strength of the solid polymer electrolyte has also been improved. The results show that the solid electrolyte with good performance is expected to be used in lithium-ion batteries and other electrochemical energy storage systems.