The Influences of [EMIm]Ac Ionic Liquid for the Characteristics of Li‐Ion Batteries' Solid Biopolymer Blend Electrolyte Based on Cellulose Derivatives of MC/CMC Blend

• Published in: Macromolecular chemistry and physics 2022-02, Vol.223 (3), p.n/a
• Main Authors: Ndruru, Sun Theo Constan Lotebulo, Widiarto, Sonny, Pramono, Edi, Wahyuningrum, Deana, Bundjali, Bunbun, Arcana, I Made
• Format: Article
• Language: English
• Subjects: biopolymer electrolytes; Biopolymers; Carboxymethyl cellulose; Cellulose; Crystal structure; Crystallinity; Differential thermal analysis; Differential thermogravimetric analysis; Electrochemical impedance spectroscopy; Electrolytes; Elongation; Fourier transforms; Functional groups; Ion currents; Ionic liquids; Ions; Lithium-ion batteries; Magnetic properties; Mechanical properties; Metathesis; methyl cellulose; Molecular structure; Morphology; NMR; Nuclear magnetic resonance; Separators; Surface stability; Tensile strength; Thermal stability; Thermogravimetry
• ISSN: 1022-1352; 1521-3935
• DOI: 10.1002/macp.202100362

This work aims to study the influences of 1‐ethyl‐3‐methylimidazolium acetate, [EMIm]Ac ionic liquid incorporation with various weight percentage to the characteristics of biopolymer blend electrolytes (BBEs) based on methyl cellulose/carboxymethyl cellulose (MC/CMC) (50/50) blend, i.e., the ionic conductivities, crystallinities, mechanical properties, surface morphology, and thermal stability. [EMIm]Ac ionic liquid is synthesized using a metathesis reaction between [EMIm]Br and CH3COOK in methanol solvent, while the BBEs preparation is conducted using casting solution technique. The functional groups and molecular structure of BBEs samples are confirmed by using Fourier transform infra red (FTIR) and nuclear magnetic resonce (NMR), while the characteristics of ionic conductivities, mechanical properties, crystallinities, surface morphology, and stability thermal are conducted using electrochemical impedance spectroscopy, tensile tester, X‐ray diffraction (XRD), scanning electron microscopy, and thermogravimetry analysis/differential thermogravimetry (TGA/DTG). The [EMIm]Ac ionic liquid incorporation greatly affects the characteristics of BBEs with optimum condition at the 15% [EMIm]Ac ionic liquid incorporation with a value of 1.53 × 10−2 S cm−1, 20.83 MPa/21.57%, and 217.24–356.34 ℃ for ionic conductivity, tensile strength/elongation at break, and decomposition temperature, respectively. The optimum condition from this study fulfills the standard minimum requirement for a lithium‐ion battery separator. A simple casting solution technique can be conducted to prepare the solid electrolytes to change the liquid electrolytes. The [EMIm]Ac ionic liquid incorporation improves the solid biopolymer electrolyte membranes based on 10% LiClO4‐complexed methyl cellulose/carboxymethyl cellulose (50/50) blend characteristics, i.e., ionic conductivities, mechanical properties, and thermal stability. These characteristics fulfills the separator and electrolyte requirement for Li‐ion batteries application.