Cell & Pack Manufacturing

Dry Electrode Technology - Advancing, Yet Not Production-Ready at Scale Dry-electrode technology forms battery electrodes by coating and calendering a powder–binder mixture-typically PTFE-based-directly onto the current collector without the use of solvents, eliminating the need for energy-intensive oven-drying steps. The primary advantages are the potential for lower manufacturing costs and energy consumption, a smaller factory footprint, and higher throughput by avoiding solvent handling, recovery, and drying processes. Historically, the approach proved significantly more challenging to scale than conventional wet-coating methods. Achieving consistent powder dispersion, uniform film thickness, strong adhesion and cohesion, and effective defect control required new equipment architectures and process controls that did not yet exist at industrial scale. Early development programs - including Teslaʼs initial 4680 battery ramp with dry coated anodes- encountered substantial manufacturing challenges, with Elon Musk noting that dry-electrode processing (particularly for cathodes) was “way harderˮ than anticipated. However, the industry has since made meaningful progress. By the 2024, improvements in mixing, powder handling, calendering, and inline quality control began enabling more stable, high-throughput manufacturing. Dry coated cathodes have yet to be produced at high volume. Dry Electrode Technology Advantages:

Eliminates NMP, solvent recovery systems, and long drying ovens → reduces CapEx & OpEx.

Reduced factory footprint due to shorter process flow.

Enables thicker electrodes (higher areal loading) with maintained mechanical integrity. Dry Electrode Technology Challenges:

Achieving consistent binder fibrillation across different materials.

Controlling porosity, adhesion, and compression without slurry-based homogenization.

Equipment availability: limited commercial-scale dry-coating lines proven at GWh scale.

Sensitivity to powder morphology, particle size distribution, and surface chemistry.

Electrochemical performance variability vs. optimized wet-process electrodes.

Source: Dry Electrode Technology 1 Dry Electrode Technology 2 Tesla Nov 2025 Annual Shareholder Meeting

Binder fibrillation is the key enabler of dry electrode processing, forming a nanofiber network that mechanically binds particles without solvent and enables strong, flexible, high-loading electrodes.

Extracted from the PDF; charts and images may read imperfectly.