Impact of Formulation and Slurry Properties on Lithium-ion Electrode Manufacturing

The impact of formulation and slurry properties on lithium-ion electrode manufacturing is significant. The combination of materials in the electrodes, including the active material, conductive additive, and binders, plays a crucial role in determining the characteristics and performance of LIBs.

Dr. Carl Reynolds, Dr. Mona Faraji Niri, Dr. Marc Francis Hidalgo, Robert Heymer, Dr. Luis Román, Giar Alsofi, Halima Khanom, Ben Pye, James Marco, Prof. Emma Kendrick, Impact of Formulation and Slurry Properties on Lithium-ion Electrode Manufacturing, Batteries & Supercaps 2024, Chemistry Europe

Impact of Formulation and Slurry Properties on Lithium-ion Electrode Manufacturing

Understanding the interdependencies between these components is essential for optimizing cell performance. However, the myriad of possible combinations makes optimization challenging and costly.

To address this, a model-based approach to predict the outcome of different combinations can be very used. At the intersection of the design of experiments (DoE) and advanced machine learning approaches, the electrode characteristics and the LIB electrochemical features can be predicted.

In a case study conducted by WMG University of Warwick, together with University of Birmingham and London south Bank University, this model-based formulation impact analysis has been tackled systematically. This work focuses on an industry-relevant graphite anode system and maps the impact of different weight fractions of active material, conductive additive, and a two-component binder system to the cell energy capacity.

The research reveals that slurry viscosity, adhesion, and conductivity are heavily influenced by the formulation and slurry properties.

Key highlights:

  • It notes that the binders carboxymethyl cellulose (CMC) and styrene-butadiene rubber (SBR) both increase the viscosity of the slurry, The addition of conductive additive also increases viscosity.
  • Weight fraction has the strongest impact on the extension time to breakup for the mixtures.
  • Weight fraction is also the most critical factor for the electrode coat weight. The coat weight however decreases with the conductive additive contents. It also decreases with the content of CMC and SBR.
  • SBR content is the key driver of the high adhesivity in the mixture, while the conductive additive is a weaker contributing factor.

This is an overview of the technical paper and a full copy can be accessed via the link in the reference: Dr. Carl Reynolds, Dr. Mona Faraji Niri, Dr. Marc Francis Hidalgo, Robert Heymer, Dr. Luis Román, Giar Alsofi, Halima Khanom, Ben Pye, James Marco, Prof. Emma Kendrick, Impact of Formulation and Slurry Properties on Lithium-ion Electrode Manufacturing, Batteries & Supercaps 2024, Chemistry Europe

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