Binders

Binders are the silent backbone of every coated electrode — they hold active material and conductive additive against the current collector through slurry mixing, calendering, and thousands of charge cycles of volumetric strain. The right binder choice can decide whether a silicon anode survives 100 cycles or 1000, whether a high-voltage cathode tolerates 4.6 V, and whether your line runs water-based or NMP-based.

This collection covers research and pilot-scale binder chemistries beyond the standard PVDF / CMC / SBR baseline, organized by the binding mechanism a researcher cares about:

Mechanical-adhesion polymers

• HNBR (hydrogenated nitrile butadiene rubber): elastomeric binder for NCM / NCA cathodes; tolerates high-rate cycling with low electrolyte swelling.
• PAA + SWCNT composite dispersion: stiff hydrogen-bonding matrix paired with a conductive nanotube network — a workhorse approach for silicon anodes.
• BPEI (branched polyethyleneimine): amine-rich polymer that doubles as a polysulfide trap in lithium-sulfur cells.

Bio-based and aqueous binders

• CCS (carboxymethyl chitosan), xanthan gum, gelatin: water-processable polysaccharides and proteins rich in -OH, -NH2, and -COOH groups; PVDF-replacement candidates for graphite and silicon.
• DSS (dextran sulfate sodium): sulfonate-bearing biopolymer studied for high-voltage LCO and spinel LMO cathodes, where -SO3- groups coordinate manganese.
• beta-cyclodextrin, tannic acid: small-molecule and oligosaccharide binders that exploit dense hydroxyl networks for self-healing on volume-change anodes.

Lithiated and inorganic binders

• CMCLi (lithium carboxymethyl cellulose): Li-exchanged CMC that contributes mobile Li+ along the binder backbone, shortening ion-diffusion paths.
• STMP (sodium trimetaphosphate): inorganic aqueous binder that condenses into a 3D phosphate network — explored for both Li-ion and Na-ion electrodes.

Fluoropolymers for non-binder electrode roles

• PTFE nanopowder: hydrophobic agent for gas diffusion layers in fuel cells and electrolyzers — included here as an electrode-additive fluoropolymer rather than a slurry binder.

If you are screening silicon-anode chemistries, start with the PAA/SWCNT, CCS, and tannic-acid options. For high-voltage cathodes, look at DSS and HNBR. For sulfur cathodes, BPEI and beta-CD are the most studied here. For electrolyzer and fuel-cell builds, the PTFE nanopowder belongs with the Electrolyzers & Fuel Cells consumables. Broader process context lives in Battery Consumables.