The critical constraint that the patent data also documents is that sulfide electrolytes require controlled-atmosphere manufacturing to prevent degradation on contact with moisture and air. Solid-state battery electrolytes show a different pattern, which the study attributes to the manufacturing specificity of the technical challenges. QuantumScape, which holds one of the most recognised oxide electrolyte patent portfolios, completed A-sample deliveries to Volkswagen in 2023 but has not yet confirmed volume production timelines. Solid Power delivered engineering cells to BMW and Ford in 2023 using sulfide electrolytes and reported engineering sample validation results in 2025, but has not announced production vehicle application dates. The equipment to do this at high yield and high throughput does not yet exist at commercial scale for any electrolyte platform.