Trinseo’s new lithium-ion anode binder reduces DCIR and surface resistivity with uniform electrode distribution

Trinseo has introduced VOLTABOND 211, an advanced water-based styrene-butadiene (SBR) binder designed for lithium-ion battery anodes incorporating graphite and silicon materials. This new binder improves upon its predecessor, VOLTABOND 029, by reducing electrode surface resistivity by 5% and cutting direct current internal resistance (DCIR) by up to 18% in a 4 Ah pouch cell configuration. These enhancements are significant for battery performance, particularly in fast-charging applications where lower internal resistance can reduce heat generation and allow for higher charging currents without compromising safety. The key innovation behind VOLTABOND 211 lies in its ability to prevent binder migration during the electrode drying process. Typically, binders tend to move towards the electrode surface as the solvent evaporates, resulting in uneven distribution that weakens adhesion at the current collector interface and obstructs lithium-ion transport pathways. By maintaining a uniform binder distribution throughout the electrode cross-section, VOLTABOND 211 ensures better cohesion and electrical connectivity, directly contributing to the observed improvements in DCIR and surface resistivity. Another important aspect of VOLTABOND 211 is its compatibility with silicon-based anodes, which are known for their high theoretical capacity but also for significant volumetric expansion during charging cycles. This expansion places considerable mechanical stress on the binder, demanding materials that can sustain strong adhesion and performance at elevated temperatures. Trinseo highlights that the new binder retains robust peel strength and thermal stability, making it well-suited for next-generation silicon-enhanced battery technologies. Arthas Yang, Senior Vice President of Latex Binders at Trinseo, emphasised the urgency of fast-charging capabilities in today’s market, noting that rapid charging is no longer a future ambition but a current necessity. VOLTABOND 211 represents the second product in Trinseo’s fourth-generation SBR binder platform and is now commercially available across key regions including Asia-Pacific, Europe, and North America. This development offers cell manufacturers a valuable tool to optimise battery performance without altering cell chemistry or design, potentially accelerating the adoption of faster, more efficient electric vehicle batteries.