Sodium-ion batteries (SIBs) are rapidly emerging as a cost-effective alternative for energy storage and low-speed mobility.
The selection of conductive additive directly determines electrode impedance, rate capability and long-term cycling performance.
A widely discussed question among battery R&D teams:
Single-Walled Carbon Nanotubes (SWCNT) or Multi-Walled Carbon Nanotubes (MWCNT)?
MWCNT – Mature mainstream solution
Multi-walled carbon nanotubes are currently the dominant conductive additive for commercial sodium-ion cells.
Advantages: Mature mass production, competitive cost, easy dispersion for conventional electrode formulas.
Limitation: Larger tube diameter, limited contact points. Conductive network easily breaks under volume expansion during cycling. Performance bottlenecks emerge for high-loading electrodes and long-cycle systems.
SWCNT – Next-generation conductive additive for advanced SIBs
Single-walled carbon nanotubes feature ultra-small diameter and ultra-high length-diameter ratio.
Tiny dosage can build interconnected, continuous 3D conductive networks inside electrodes.
Key benefits for sodium-ion batteries:
- Lower electrode impedance
- Improved sodium ion migration
- Better tolerance for active material volume variation
- Significant enhancement in cycle life & high-rate discharge performance
For high-energy-density sodium-ion batteries, silicon composite anodes, and emerging quasi-solid-state sodium cell projects,
SWCNT shows obvious performance advantages, even with much lower addition amount compared to MWCNT.
Core Conclusion
MWCNT fits existing mass-produced sodium-ion battery lines pursuing balance of cost and basic performance.
SWCNT is the preferred candidate for next-generation high-performance sodium-ion battery R&D, targeting long-cycle, high-power energy storage applications.
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