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

Abstract

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

Nanoscale Synthesis of Li1.3Al0.3Ti1.7(PO4)3 Solid-State Lithium Ion Battery Electrolyte: A Structural and Ionic Conductivity Study

“…44−46 The Raman spectrum of C-LATP-800−2 was recorded from 100 to 1200 cm −1 . As displayed in Figure 1C, the peaks recorded in the range 180−400 cm −1 correspond to the PO 4 3− liberations and the transitional vibration modes of Ti 4+ and PO 4 3− . Similarly, the bending vibration modes of P−O were observed at around 450−700 cm −1 .…”

“…Batteries, supercapacitors, and ultracapacitors are a few examples of electrochemical-based energy storage devices. 3,4 Among them, the secondary type of rechargeable battery has its own merits due to high output voltage, long-lasting cycling life, and higher energy density. At present, Li-based rechargeable batteries dominate the market.…”

“…Though various types of energy storage devices were available in the past, electrochemical-based storage devices have been engrossed by researchers in the recent days due to their high energy density, viable energy supply, easy implementation, high power density, and cost-effectiveness. Batteries, supercapacitors, and ultracapacitors are a few examples of electrochemical-based energy storage devices. , Among them, the secondary type of rechargeable battery has its own merits due to high output voltage, long-lasting cycling life, and higher energy density. At present, Li-based rechargeable batteries dominate the market.…”

Fabrication of solid polymer electrolyte based on carboxymethyl cellulose complexed with lithium acetate salt as Lithium‐ion battery separator

“…However, the CMC-based solid polymer electrolyte membrane's tensile strength decreases until 12.84 MPa after 30%wt LiCH 3 COO salt addition. According to Mohanty et al, 67 the lithium salt addition to SPEs will decrease the tensile strength. This decrease in the…”

“…Both of these parameters are important for enhancing the durability of SPEs against dendrite-induced damage. 67 Mechanical properties can evaluate the SPE's ability to assist the separator in preventing battery short circuits caused by cracks in the separator due to stress and pressure during battery operation and assembly. Electrical short-circuit can occur if particles from the electrodes intrude on the separator.…”