Gotion, a strategic partner of Volkswagen, has announced a new development in battery technology with its Jinshi all-solid-state battery. The company claims the battery has achieved an energy density of 400 Wh/kg, based on a sulfur-based solid electrolyte. This is an increase from a previous figure of 350 Wh/kg for the same technology. It is important to note that this energy density refers to the individual battery cells, not the complete battery system that would be installed in an electric vehicle. Gotion also states that its cells have undergone rigorous safety testing, including puncturing, high-temperature exposure, crushing, external short-circuiting, and overcharging, with no fires reported during these tests. The company aims for a long-term production cost of around 1 yuan per watt-hour, which is approximately 130 euros per kilowatt-hour. While this cost is still higher than that of lithium iron phosphate (LFP) batteries currently manufactured in China, reaching this level would represent a significant advancement for solid-state battery technology. To reduce costs, Gotion is developing its own processes for manufacturing lithium sulfide, a key component in its batteries. The company claims to have increased the efficiency of this process by three times. Volkswagen has partnered with Gotion since 2020 and is one of its strategic investors. Recently, the two companies have expanded their collaboration, particularly in the production of LFP batteries in Europe. Joint projects are underway in Spain, Slovakia, and Morocco. However, at this stage, there is no confirmation that Gotion's solid-state battery will be used in any Volkswagen vehicle models soon. The transition from technical performance to mass production remains a major challenge for solid-state battery technology. The real challenge for companies like Gotion lies in scaling up their technology to meet the demands of mass production. While achieving high energy density and passing safety tests are important milestones, turning these into commercially viable products requires significant investment and innovation. Solid-state batteries have the potential to revolutionize the electric vehicle industry, but the path to widespread adoption remains complex and competitive.