Ferroelectric Ceramic Materials Enable High-Performance Organic-Inorganic Composite Electrolytes in Solid-State Lithium Metal Batteries

Abstract

Abstract Compared to commercial lithium-ion batteries, all-solid-state batteries can greatly increase the energy density, safety, and cycle life of batteries. The development of solid-state electrolyte with high lithium-ion conductivity and wide electrochemical window is the key for all-solid-state batteries. In this work, we report on the achievement of high ionic conductivity in the PAN/LiClO4/BaTiO3 composite solid electrolyte (CSE) prepared by solution casting method. Our experimental results show that the PAN-based composite polymer electrolyte with 5 wt% BaTiO3 possesses a high room-temperature lithium-ion conductivity (9.85 × 10−4 S⋅cm−1), high lithium-ion transfer number (0.63), wide electrochemical window (4.9 V vs Li+/Li). The Li|Li symmetric battery assembled with 5 wt% BaTiO3 can be stably circulated for 800 h at 0.1 mA⋅cm−2, and the LiFePO4|CSE|Li battery maintains a capacity retention of 86.2% after 50 cycles at a rate of 0.3 C. The influence of BaTiO3 ceramic powder on the properties of PAN-based polymer electrolytes is analyzed. Our results provide a new avenue for future research in the all-solid-state lithium battery technology.