Sustainable Biomass-Derived Binders for High-Performance Lithium-Ion Batteries

Strategic Insights -

Researchers from the Qingdao University of Science and Technology have developed a novel biomass-derived carboxymethyl cellulose lithium (CMCLi) binder for lithium-ion batteries. This eco-friendly binder shows improved performance and is synthesized from agro-forestry biomass, including poplar wood and corn stover. The findings highlight the potential of this sustainable binder for next-generation lithium-ion batteries.

Key Takeaways:

  • Biomass-derived carboxymethyl cellulose lithium (CMCLi) binders were synthesized from poplar wood and corn stover using green deep eutectic solvents.
  • The purified cellulose was subjected to alkaline swelling, alkalization, and etherification to produce high-performance CMC-Li binders.
  • CMC-Li binders derived from neutral choline chloride (ChCl)/ethylene glycol (EG) pretreatment (CMC-Li-PW(EG) and CMC-Li-CS(EG)) exhibited improved molecular weight and uniform molecular weight distribution.
  • LFP batteries fabricated with CMC-Li binders displayed smoother surfaces, uniform particle distribution, and minimal agglomeration or voids, resulting in enhanced Young's modulus and adhesion strength.
  • CMC-Li binders demonstrated low charge impedance, superior cyclic voltammetry performance, high initial charge-discharge capacities (175/174 mAh/g and 173/172 mAh/g), high initial Coulombic efficiency (98%), and low capacity loss (4.2% after 200 cycles).

Statistics:

  • 98% initial Coulombic efficiency achieved by CMC-Li binders.
  • 175/174 mAh/g and 173/172 mAh/g initial charge-discharge capacities of LFP batteries fabricated with CMC-Li binders.
  • 4.2% capacity loss after 200 cycles using CMC-Li binders.

Sources:

  • "Developing sustainable carboxymethyl cellulose lithium binders using agro-forestry biomass for high-performance LiFePO4 cathode" (International Journal of Biological Macromolecules, 2025;323:147049).
  • Qingdao University of Science and Technology, State Key Laboratory Base of Eco-Chemical Engineering, College of Chemical Engineering.
  • Weihao Xiang, Lili Qin, Shiwei Liu, Lu Li, Yue Liu, Yuxiang Liu, Genkuo Nie, Hailong Yu, and Jingxin Li.
  • International Journal of Biological Macromolecules, Elsevier, Radarweg 29, 1043 Nx Amsterdam, Netherlands.
  • www.elsevier.com; www.journals.elsevier.com/international-journal-of-biological-macromolecules/