Tesla Achieves Mass Production of Fully Dry Electrode Cathodes, Cutting 4680 Battery Costs Nearly in Half

Tesla has successfully industrialized and mass-produced its all-dry electrode cathode technology, implementing it in the latest version of its 4680 battery. This technological breakthrough is detailed in a patent filed with the United States Patent and Trademark Office (Patent No.: US 2025/0364562), which addresses the longstanding challenges of dry-process cathode powders—specifically their brittleness and difficulty in high-speed coating. Conventional battery cathodes typically rely on wet-slurry processes that require toxic liquid solvents, along with energy-intensive drying ovens and solvent recovery systems. Tesla has developed a composite binder system combining polytetrafluoroethylene (PTFE) and polyvinylidene fluoride (PVDF). After high-shear air jet milling, this binder forms a microscopic web-like structure that firmly binds active material particles without any solvent, creating a flexible, self-supporting electrode film. Simultaneously, Tesla optimized the particle size of the active materials to reduce specific surface area, enabling binder content to be kept below 2%—ensuring lithium-ion conductivity remains unaffected. In terms of manufacturing, the new process reduces the number of high-pressure calendering steps from ten to just three, tripling production efficiency compared to previous methods. By eliminating the need for hundreds of meters of drying lines and solvent recovery systems required in wet processes, this dry-electrode technology reduces factory footprint by up to 50%, cuts equipment investment by over 40%, and nearly halves the overall electrode production cost. Performance testing shows that batteries manufactured using this dry process retain approximately 90% of their initial capacity after 2,000 charge-discharge cycles. Tesla confirmed in January 2026 that its Gigafactory Texas has begun mass production of 4680 cells featuring fully dry-processed electrodes for both cathode and anode. The second-generation 4680 cells are already being used in select Model Y vehicles produced at the Austin factory and are scheduled for expansion to the Cybertruck, Cybercab, and Semi electric truck between 2026 and 2027.