Effect of Lithium Salt Concentration on Materials Characteristics and Electrochemical Performance of Hybrid Inorganic/Polymer Solid Electrolyte for Solid-State Lithium-Ion Batteries

Lithium-ion batteries are popular energy storage devices due to their high density. Solid electrolytes appear be a potential replacement for flammable liquid in lithium batteries. This inorganic/hybrid solid electrolyte is composite of bis(trifluoromethanesulfonyl)imide (LiTFSI) salt, (poly(vinylidene fluoride-hexafluoro propylene) (PVDF-HFP) polymer and sodium superionic conductor (NASICON)-type Li1+xAlxTi2−x(PO4)3 (LATP) ceramic powder. The structure, morphology, mechanical behavior, electrochemical performance this electrolyte, based on various amounts LiTFSI, were investigated. lithium-ion transfer conductivity increased as the LiTFSI salt concentration increased. However, strength apparently decreased once percentage LITFSI was over 60%. hybrid with 60% content showed ionic 2.14 × 10−4 S cm−1, wide stability window (3–6 V) good stability. capacity Li|60% LiTFSI/PVDF-HFP/LATP| LiFePO4 solid-state lithium-metal battery 103.8 mA h g−1 at 0.1 C, high-capacity retention 98% after 50 cycles.