Toyota’s Solid-State Breakthrough: EV Batteries Built to Last 40 Years
Toyota is gearing up to transform the electric vehicle industry with next-generation solid-state batteries (SSBs) that promise an unprecedented 40-year lifespan and extended driving ranges beyond 621 miles (1,000 km). The automaker plans to bring these advanced batteries to market by 2027–2028, marking a pivotal shift in sustainable EV technology. Quadruple the Lifespan, Smaller Footprint Recent reports suggest Toyota’s SSBs could maintain up to 90% capacity after 40 years, compared to roughly 10 years for today’s lithium-ion batteries. This extraordinary durability means one solid-state unit could replace four conventional batteries over its lifetime—dramatically cutting production emissions and waste. The new design swaps flammable liquid electrolytes for solid materials, enhancing safety, energy density, and charging speed. The result: smaller, lighter battery packs that deliver longer range and faster charging with reduced overheating risks. From Premium to Mainstream Toyota executives say early versions will appear first in premium models such as the Lexus or Century before scaling down to high-volume vehicles like the next-generation Corolla. While initial costs are expected to be high, Toyota anticipates prices will fall as production scales and supply chains mature. With their extended lifespan, solid-state batteries could outlast the vehicles they power, enabling battery-swapping or reuse across multiple cars—potentially two or three times—making the upfront investment more sustainable over time. Strategic Partnerships Driving Innovation Toyota’s progress stems from a deep partnership with Sumitomo Metal Mining, focused on developing robust cathode materials that withstand repeated charge cycles. Leveraging Sumitomo’s advanced powder synthesis technology, the pair has created a high-durability cathode ready for mass production as early as Japan’s 2028 fiscal year. This collaboration aligns with Japan’s broader push to secure a domestic EV battery supply chain, reducing reliance on imports from China and South Korea. Backed by government support, Japanese automakers and suppliers are investing over $7 billion (1 trillion yen) in local battery manufacturing capacity. In parallel, Toyota is working with Idemitsu Kosan, a major oil refiner, to produce lithium sulfide, a key material for SSBs. Idemitsu is building a large-scale facility capable of generating 1,000 metric tons annually, targeting mass production by 2027. Challenges Ahead, Momentum Building Despite significant progress, experts note that mass adoption of solid-state batteries will take time, citing supply constraints, complex manufacturing, and high costs. Still, Toyota’s advances indicate real momentum toward commercial viability, positioning the company at the forefront of next-generation EV power solutions. As the global race for battery innovation intensifies, Toyota’s 40-year solid-state technology could redefine what durability, efficiency, and sustainability mean in the electric era.
Cracking the Code on Lithium Battery Safety
New research reveals hidden risks in solid-state designs — and a path toward safer, longer-lasting batteries. They’re small, powerful, and packed with potential — but lithium batteries still have one explosive problem: dendrites. These tiny, needle-like metal structures can grow inside a battery, short-circuit it, and in the worst cases, cause fires or explosions. Until now, scientists believed they had a solution. Solid-state batteries, especially those using polymer-based electrolytes, were thought to be the ultimate fix — stable, solid, and far less flammable than liquid-based designs. But a team at the Technical University of Munich (TUM) has just discovered something that could change that narrative. Their research shows that dendrites can form not only at the electrodes — where they were expected — but also within the polymer electrolyte itself. That’s the very material meant to prevent these dangerous growths. “Our measurements show that dendrite growth can also occur directly inside the polymer electrolyte — in the very material designed to stop it,” says Fabian Apfelbeck, a physicist pursuing his doctorate at TUM and lead author of the study. This revelation could reshape how scientists approach solid-state battery design. To uncover this hidden process, the TUM team used a nanofocus X-ray technique at the German Electron Synchrotron (DESY) in Hamburg. With an X-ray beam just 350 nanometers wide — roughly 200 times thinner than a human hair — they watched structural changes unfold inside a working battery for the first time. The finding surprised even seasoned researchers. “We’ve long assumed dendrites only grow at the interface between electrode and electrolyte,” explains Prof. Peter Müller-Buschbaum, who leads TUM’s Chair of Functional Materials. “Seeing them form deeper inside the material challenges that assumption completely.” Understanding where dendrites form — and why — is a critical step toward creating safer, longer-lasting, and more efficient solid-state batteries. With this knowledge, researchers can now focus on developing electrolytes that stop internal crystallization before it starts. The study, “Local crystallization inside the polymer electrolyte for lithium metal batteries observed by operando nanofocus WAXS,” was published in Nature Communications in 2025.
