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    Gelatin and Alginate Binders for Simplified Battery Recycling

    Year: 2022

    Journal: J. Phys. Chem. C, Volume 126, MAY 19, page 8489–8498

    Authors: Scott, Sean; Terreblanche, Jason; Thompson, Dana L.; Lei, Chunhong; Hartley, Jennifer M.; Abbott, Andrew P.; Ryder, Karl S.

    Organizations: Faraday Institution [FIRG005, FIRG006]

    The water-soluble biopolymers, gelatin and sodiumalginate, were investigated as potential alternative binders for use inlithium-ion battery anodes. The polymers were modified using a deepeutectic solvent (DES) made from choline chloride and glycerol. It wasfound that the addition of the DES resulted in greater plasticity andadhesion with respect to the unmodified binders and also to the currentcommonly used PVDF or CMC/SBR binders. Both the modified gelatinand sodium alginate binders are dispersible in water and can be rapidlydelaminated by using mild ultrasound. These latter points are key steps inthe function of the anode material and the subsequent recycling at theend of life. Imaging of the coatings formed using scanning electronmicroscopy and atomic force microscopy showed that the two types ofbinders dispersed themselves differently around the graphite particles,with the gelatin binder being distributed across the entire electrodesurface, whereas the sodium alginate binder remained located at the hydrophilic edge planes of the graphite.
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