Volume 42, Issue 3 2000428
Communication

Lignin-Based Solid Polymer Electrolytes: Lignin-Graft-Poly(ethylene glycol)

Hailing Liu

Hailing Liu

Department of Chemical and Biomedical Engineering, Florida A&M University–Florida State University College of Engineering, 2525 Pottsdamer Street, Suite A131, Tallahassee, FL, 32310 USA

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Logan Mulderrig

Logan Mulderrig

Department of Chemical and Biomedical Engineering, Florida A&M University–Florida State University College of Engineering, 2525 Pottsdamer Street, Suite A131, Tallahassee, FL, 32310 USA

Aero-Propulsion, Mechatronics, and Energy (AME) Center, Florida State University, 2003 Levy Avenue, Tallahassee, FL, 32310 USA

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Daniel Hallinan Jr.

Corresponding Author

Daniel Hallinan Jr.

Department of Chemical and Biomedical Engineering, Florida A&M University–Florida State University College of Engineering, 2525 Pottsdamer Street, Suite A131, Tallahassee, FL, 32310 USA

Aero-Propulsion, Mechatronics, and Energy (AME) Center, Florida State University, 2003 Levy Avenue, Tallahassee, FL, 32310 USA

E-mail: [email protected]; [email protected]

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Hoyong Chung

Corresponding Author

Hoyong Chung

Department of Chemical and Biomedical Engineering, Florida A&M University–Florida State University College of Engineering, 2525 Pottsdamer Street, Suite A131, Tallahassee, FL, 32310 USA

E-mail: [email protected]; [email protected]

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First published: 07 October 2020
Citations: 19

Abstract

Lignin is an aromatic-rich biomass polymer that is cheap, abundant, and sustainable. However, its application in the solid electrolyte field is rare due to challenges in well-defined polymer synthesis. Herein, the synthesis of lignin-graft-poly(ethylene glycol) (PEG) and its conductivity test for a solid electrolyte application are demonstrated. The main steps of synthesis include functionalization of natural lignin's hydroxyl to alkene, followed by graft-copolymerization of PEG thiol to the lignin via photoredox thiol-ene reaction. Two lignin-graft-PEGs are prepared having 22 wt% lignin (lignin-graft-PEG 550) and 34 wt% lignin (lignin-graft-PEG 2000). Then, new polymer electrolytes for conductivity tests are prepared via addition of lithium bis-trifluoromethanesulfonimide. The polymer graft electrolytes exhibit ionic conductivity up to 1.4 × 10−4 S cm−1 at 35 °C. The presence of lignin moderately impacts conductivity at elevated temperature compared to homopolymer PEG. Furthermore, the ionic conductivity of lignin-graft-PEG at ambient temperature is significantly higher than homopolymer PEG precedents.

Conflict of Interest

The authors declare no conflict of interest.

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