Abstract
A new type of nanopolypyrrole/organically modified montmorillonite-ionic liquid gel polymer electrolyte (ppy/OMMT-ILGPE) is prepared based on nanopolypyrrole/organically modified montmorillonite (ppy/OMMT), N-butyl-N- methylpyrrolidinium bis(trifluoromethanesulfonyl)imide (PP14TFSI), lithium-bis(trifluoromethanesulfonyl) (LiTFSI), polyvinylidene difluoride (PVDF), methyl methacrylate (MMA), and benzoyl peroxide (BPO) by an in situ method. The effect of nano-ppy/OMMT on the physical and electrochemical properties of an ionic liquid gel polymer electrolyte is demonstrated. The results show that nano-ppy/OMMT-ILGPE has a porous structure with a large surface area, and the diameter of the pores on the surface is approximately 1-2 μm. The Li+ transference number of 0.72 is achieved, and the ionic conductivity reaches up to 1.2 × 10−3 S/cm at room temperature. Nano-ppy/OMMT-ILGPE has good thermal stability and mechanical properties. Meanwhile, nano-ppy/OMMT-ILGPE has fine cycle performance in the Li|nano-ppy/OMMT-ILGPE|LiNi1/3Co1/3Mn1/3O2 coin cell. The good electrochemistry performance of nano-ppy/OMMT-ILGPE means that it can act as an ideal gel polymer electrolyte material for lithium ion batteries.
Highlights
The organic electrolyte plays an important part in lithium ion batteries (LIBs)
polyvinylidene difluoride (PVDF), which has a high degree of crystallization, is a common organic polymer support material in the field of ionic liquid gel polymer electrolytes (ILGPEs) [6]
To confirm the difference in the thicknesses of the passive films on the surfaces of nano-ppy/organic modified montmorillonite (OMMT)-ILGPE and ILGPE subjected to charge and discharge tests at room temperature, the Electrochemical impedance spectroscopy (EIS) values of the cells before and after 100 cycles at 0.5 C are shown in Figures 8(d) and 8(e)
Summary
The organic electrolyte plays an important part in lithium ion batteries (LIBs). the organic electrolyte is volatile, toxic, and explosive to the environment, and the development of LIBs has been limited. PVDF, which has a high degree of crystallization, is a common organic polymer support material in the field of ILGPEs [6]. Under the action of FeCl3 as the oxidant and sodium p-toluene sulfonate (TSANa) as the swelling agent, pyrrole (py) monomer was polymerized between the molecular layers of nano-organic modified montmorillonite (OMMT) by an in situ method. This method was used to prepare nano-ppy/OMMT, leading to enhanced electrochemical properties. The microstructure and electrochemical performance of nano-ppy/OMMT-ILGPE are discussed in detail
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