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PreprintCC BYChemRxiv

Functional-Group Effects in Biopolymer Binders for Sodium-Ion Battery Electrodes: Interfaces, Rheology, and Electrochemical Performance

  • Lin Chen1,2,3
  • Faduma Maddar4
  • Tengfei Song1,2
  • Brij Kishore1,2
  • Subha Samanta1,2
  • Sam Hare1,2
  • Hiroto Kitaguchi1,2
  • Marc Walker5
  • Ivana Hasa4
  • Peter Slater3,2
  • Emma Kendrick1,2
5 affiliations
  1. 1School of Metallurgy and Materials
  2. 2University of Birmingham
  3. 3School of Chemistry
  4. 4Warwick Manufacturing Group (WMG), University of Warwick, Gibbet Hill Road, Coventry, UK, CV4 7AL
  5. 5Dept. of Physics, University of Warwick, Gibbet Hill Road, Coventry, UK, CV4 7AL
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Abstract

Binders, though typically only a few weight percent of a battery electrode, play an outsized role in determining cell performance and sustainability. Water-soluble green binders have emerged as eco-friendly alternatives that enable aqueous slurry processing and easier recyclability. In this work, we leverage biopolymer-based binders (CMC/SBR, Guar Gum and ι-carrageenan) in sodium-ion battery electrodes (Prussian white cathodes and hard carbon anodes) to demonstrate a new paradigm of sustainable electrode design. Our findings highlight that biopolymer binders (Guar Gum and ι-carrageenan) can effectively “glue” sodium-ion battery electrodes together forming a robust structural network and refine the composition of the passivation layer on electrode interface through the functional groups (hydroxyl, carboxyl, and sulfate bonding). By replacing conventional binders with these green alternatives, high-capacity retention and rate capability were achieved when paired with hard carbon electrodes, all with the added benefits of aqueous processability and sustainability.

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Cite

BibTeXRIS
BibTeX
@misc{chen2026functionalgroup,
  title = {{Functional-Group Effects in Biopolymer Binders for Sodium-Ion Battery Electrodes: Interfaces, Rheology, and Electrochemical Performance}},
  author = {Lin Chen and Faduma Maddar and Tengfei Song and Brij Kishore and Subha Samanta and Sam Hare and Hiroto Kitaguchi and Marc Walker and Ivana Hasa and Peter Slater and Emma Kendrick},
  howpublished = {ChemRxiv},
  year = {2026},
  month = oct,
  doi = {10.26434/chemrxiv.15010776/v1},
  url = {https://chemrxiv.org/doi/full/10.26434/chemrxiv.15010776/v1},
  note = {CC BY},
}
RIS
TY  - UNPB
TI  - Functional-Group Effects in Biopolymer Binders for Sodium-Ion Battery Electrodes: Interfaces, Rheology, and Electrochemical Performance
AU  - Lin Chen
AU  - Faduma Maddar
AU  - Tengfei Song
AU  - Brij Kishore
AU  - Subha Samanta
AU  - Sam Hare
AU  - Hiroto Kitaguchi
AU  - Marc Walker
AU  - Ivana Hasa
AU  - Peter Slater
AU  - Emma Kendrick
PY  - 2026
DA  - 2026/10/21
PB  - ChemRxiv
DO  - 10.26434/chemrxiv.15010776/v1
UR  - https://chemrxiv.org/doi/full/10.26434/chemrxiv.15010776/v1
AB  - Binders, though typically only a few weight percent of a battery electrode, play an outsized role in determining cell performance and sustainability. Water-soluble green binders have emerged as eco-friendly alternatives that enable aqueous slurry processing and easier recyclability. In this work, we leverage biopolymer-based binders (CMC/SBR, Guar Gum and ι-carrageenan) in sodium-ion battery electrodes (Prussian white cathodes and hard carbon anodes) to demonstrate a new paradigm of sustainable electrode design. Our findings highlight that biopolymer binders (Guar Gum and ι-carrageenan) can effectively “glue” sodium-ion battery electrodes together forming a robust structural network and refine the composition of the passivation layer on electrode interface through the functional groups (hydroxyl, carboxyl, and sulfate bonding). By replacing conventional binders with these green alternatives, high-capacity retention and rate capability were achieved when paired with hard carbon electrodes, all with the added benefits of aqueous processability and sustainability.
ER  -