Influence of a binder on the electrochemical behaviour of Si/RGO composite as negative electrode material for Li-ion batteries

Abstract

A composite consisting of silicon nanoparticles and reduced graphene oxide nanosheets (Si/RGO) was studied as a promising material for the negative electrode of lithium-ion batteries. Commonly used polyvinylidene fluoride (PVdF) and carboxymethyl cellulose (CMC) served as a binder. To reveal the influence of the binder on the electrochemical behaviour of the Si/RGO composite, binder-free electrodes were also prepared and examined. Anode half-cells with composites comprising CMC as a binder demonstrated the best properties: capacity over 1200 mAh∙g-1, excellent cycling performance and good rate capability up to 1.0C.

Robust Polyurethane Binders Intensified by Hydrogen Bonding, a Dynamic S–S Bond, and Metal-Ion Coordination for Silicon Anodes

“…The binder, as a crucial component of the battery, serves an important function in maintaining the structural integrity of the electrode and improving its electrochemical performance. − Common Si anode binders contain poly­(acrylic acid) (PAA), carboxymethyl cellulose, alginate, etc., which are rich in hydroxyl (−OH) or carboxyl (−COOH) groups, which can form hydrogen bonds with the surface of Si particles to enhance adhesion. However, these linear binders are poorly effective in suppressing the volume expansion of the Si anode and have failed to provide the desirable mechanical strength and stable electrochemical properties. − Therefore, it is essential to explore modification strategies based on existing binders to make them more effective.…”