Isolation and characterization of lignins from wheat straw: Application as binder in lithium batteries

Juan Domínguez-Robles, Rafael Sánchez, Pilar Díaz-Carrasco, Eduardo Espinosa, M. T. García-Domínguez, Alejandro Rodríguez*

*Corresponding author for this work

Research output: Contribution to journalArticle

25 Citations (Scopus)

Abstract

Three different lignin-rich fractions have been used as binder material for electrodes in rechargeable lithium batteries. Lignin samples were obtained through three different pulping processes; kraft, soda and organosolv pulping processes, using wheat straw as raw material. Physico-chemical characterization of three types of lignins was evaluated. Characterization has been performed using Fourier transform infrared spectroscopy (FTIR) and 31P NMR Spectroscopy to analyse the functional groups; gel permeation chromatography (GPC) for determining molar mass distribution (MWD), and thermogravimetric analysis (TGA) to follow the thermal behaviour. Electrodes containing lignin or poly vinylidene fluoride (PVDF) were tested electrochemically. The three different lignin samples exhibited excellent performance as binder, retaining the specific capacity after 50 cycles at a current density of 100 mAg‐1. These results show that lignin could be used as a low-cost and environmental binder, replacing the PVDF polymer in electrodes for energy storage applications.

Original languageEnglish
Pages (from-to)909-918
Number of pages10
JournalInternational Journal of Biological Macromolecules
Volume104
Early online date04 Jul 2017
DOIs
Publication statusPublished - Nov 2017

Keywords

  • Binder
  • Lithium batteries
  • Wheat straw soda lignin

ASJC Scopus subject areas

  • Structural Biology
  • Biochemistry
  • Molecular Biology

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