The Promise of Solid-State Batteries
Solid-state batteries (SSBs) are poised to disrupt the electric vehicle market, offering an alternative to conventional lithium-ion (Li-ion) power sources. They deliver higher energy density, improved safety, and faster charging capabilities, yet face hurdles such as dendrite formation and manufacturing complexity. Companies like QuantumScape, Solid Power, Factorial Energy, and Toyota are racing to commercialize SSBs, with initial models expected to hit the market by 2027–2028 and broader adoption projected by 2035.
Advantages and Challenges of Solid-State Batteries
Most current EVs rely on lithium-ion batteries with liquid electrolytes. In contrast, solid-state batteries use solid electrolytes—ceramics, polymers, or glass-like compounds. Some SSBs are semi-solid or require a small amount of liquid to enhance conductivity. According to research from the Fraunhofer Institute for Systems and Innovation Research, SSBs can achieve energy densities of 350–500 Wh/kg, whereas today’s lithium-ion batteries max out at around 300 Wh/kg.
Another key benefit is that SSBs can reduce an EV battery's carbon footprint by up to 39% compared to lithium-based alternatives. For example, in 2023, Toyota announced that its future SSB-equipped models would be able to charge from 10% to 80% in just 10 minutes. However, a major challenge remains: dendrite growth, which can cause short circuits. A review in Nature Energy notes that no universal solution for this issue has been found yet.
QuantumScape and Solid Power have already established pilot production lines. Volkswagen is a shareholder in QuantumScape. Meanwhile, Mercedes-Benz and Factorial Energy have successfully tested a modified Mercedes EQS equipped with an SSB. That prototype traveled approximately 1,205 kilometers on a single charge, storing 25% more energy than the standard EQS battery while maintaining the same size and weight. Stellantis has also partnered with Factorial Energy, whose FEST batteries can charge from 15% to 90% in about 18 minutes at room temperature. The FEST cells deliver 375 Wh/kg even after more than 600 charge cycles.
Toyota and Idemitsu are jointly building factories to produce lithium sulfide-based solid electrolytes, aiming to launch SSB-powered EVs by 2027–2028. Japan has set a national goal to commercialize fully solid-state batteries around 2030. In the European Union, a research project called HyLiST is set to begin in 2024, focusing on advancing SSB technologies. However, BloombergNEF predicts that SSBs will account for only 10% of global demand by 2035, as they are expected to first appear in premium vehicles.
Solid-state batteries hold significant promise for the EV industry due to their higher energy density and lower carbon footprint. Yet technical obstacles like dendrite formation remain unresolved. Alongside efforts from major automakers and startups, research initiatives are playing a crucial role in accelerating SSB market entry. The gradual commercialization of these batteries could fundamentally reshape the EV landscape, especially in the premium segment.
As the automotive industry shifts towards innovative technologies, the rise of electric vehicles is complemented by advancements in personal transportation. For instance, the development of flying cars is gaining momentum, promising to redefine urban mobility and enhance the driving experience. This evolution aligns with the growing demand for sustainable solutions, making it an exciting time for both electric vehicles and aerial transportation innovations.