Carboxymethyl Cellulose (CMC) Anode Binder/Thickener
CAS Number: 9004-32-4
Battery-grade CMC sodium salt is used in combination with SBR as a thickener and binder for graphite and silicon-graphite anode aqueous slurries. It controls slurry rheology for uniform coating, and its carboxylate groups bond covalently to silicon particles during drying, helping to buffer volumetric expansion.
Technical Specifications
| appearance | White to off-white powder |
| purity (%) | ≥99.0 |
| moisture (%) | ≤10 |
| pH (1% solution) | 6.5–8.5 |
| DS (degree of substitution) | 0.7–1.0 |
| viscosity (mPa·s, 1% aqueous) | 500–3000 |
Applications
- Graphite anode slurry thickener and binder (with SBR)
- Silicon-graphite anode CMC/SBR aqueous binder system
- Hard carbon anode slurry for sodium-ion batteries
- Electrode slurry viscosity modifier
- Aqueous cathode slurry stabilizer
Key Features
- High DS (0.7–1.0) provides stable aqueous solution and effective graphite particle dispersion
- Carboxylate groups form covalent bonds with Si-OH on silicon particles, improving retention
- Wide viscosity grades (500–3000 mPa·s) to match coating equipment requirements
- Low Fe and Ni content (<5 ppm each) prevents metallic contamination of anode electrodes
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