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Enhancing Electrochemical Performance Through Improved Dispersion
Achieving high electrochemical performance depends on more than just active material selection - it also relies heavily on the internal structure and stability of the electrode. Dispersants play a critical role in shaping this structure. By improving particle distribution and modifying slurry behavior, dispersants can unlock measurable gains in capacity, rate performance, and long‑term durability.
Building a Stronger Electrochemical Framework Through Dispersion
When a dispersant is introduced into the slurry, it influences how particles pack and interact within the electrode. Better dispersion reduces agglomeration, enabling more uniform distribution of conductive additives and active materials. This improved microstructure enhances ion transport, electronic pathways, and electrode homogeneity - all essential for high‑performance battery behavior.
Adjusting dispersant dosage also affects slurry density, which in turn influences porosity and particle connectivity after drying. These structural refinements directly shape how efficiently lithium ions and electrons move during cycling, impacting both energy output and degradation rates.
Higher Capacity Through Optimized Ion and Electron Pathways
Electrochemical testing demonstrates that electrodes formulated with dispersant show higher capacity at specific C‑rates compared to formulations without it. This uplift is driven by:
- Improved conductive network formation
- Reduced particle clustering, enabling better ion access
- More consistent electrode architecture
Together, these enhancements allow the electrode to sustain higher utilization of its active material, particularly under demanding current loads. Better dispersion ensures that electrochemical reactions occur more uniformly throughout the electrode, lifting overall capacity.
Extended Cycle Life Through Structural Stability
Improved dispersion also leads to longer-lasting electrodes. Cycle‑life testing shows that electrodes containing dispersant maintain higher capacity over repeated charge‑discharge cycles. This stability arises from:
- Stronger mechanical cohesion within the electrode
- More stable conductive pathways
- Reduced particle detachment and fewer isolated regions
- More uniform SEI (solid-electrolyte interphase) formation
By strengthening both mechanical and electrochemical integrity, dispersants help mitigate degradation mechanisms that commonly shorten electrode lifespan.
Dispersion as a Strategic Tool for High‑Performance Cells
The influence of dispersants extends far beyond slurry processability. They act as a strategic lever for enhancing electrochemical performance by shaping the internal structure of the electrode. Fine‑tuning dispersant dosage enables manufacturers to optimize:
- Electrode density and porosity
- Ion and electron transport pathways
- Active material utilization
- Capacity retention and cycle stability
Through these interconnected improvements, dispersants contribute directly to more powerful, efficient, and durable lithium‑ion batteries.
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Read our Publication "Debundling of SWCNTs using a Non-Toxic, Low Carbon Footprint Dispersant"
Abstract
A fully aqueous, N-methyl-2-pyrrolidone–free strategy for debundling single-walled carbon nanotubes (SWCNTs) is reported using the renewable dispersant Vanisperse® LI. Dispersions at 2 mg mL−1 were subjected to probe ultrasonication at 0.3 W mL−1 and evaluated using oscillatory rheology. Complex viscosity (η*) exhibited a transient maximum (~75 min) consistent with the formation of a percolated fibrous network, followed by a decline as debundling progressed. An optimum dispersant coverage of ~1.5 mg m−2 minimized η*, while overdosing likely induced multilayer adsorption and bridging seen by a rapid increase in η*. A two-stage centrifugation at 10,000× g yielded storage-stable suspensions of debundled SWCNTs without ultracentrifugation. SEM confirmed substantial debundling into thin fiber-like bundles. By formulating a dispersion with a dispersant that has a significantly lower cradle-to-gate carbon footprint than both fossil-based and bio-based alternatives such as CMC, this work presents a more sustainable approach to producing debundled SWCNT dispersions for advanced material applications.
Technical Bulletin: Dispersion of Carbon Nanotubes with Vanisperse LI
Borregaard’s bio-based battery additives are designed for use in water-based electrode slurries and to stabilize aqueous carbon nanotube (CNT) dispersions. Obtained from sustainably sourced wood, our products are non-toxic, environmentally friendly, and highly effective.
Vanisperse LI provides a uniquely sustainable alternative and affords a lower CO2 footprint than petroleum-derived additives. Efficient dispersion of CNTs is critical for achieving uniform electrode composition and optimal battery performance. Sustainable water-soluble dispersants are essential to de-agglomerate CNTs in water, preventing the hydrophobic carbons from reforming agglomerates.