The lithium-ion battery has transformed everything from phones to grid storage, but its liquid electrolyte carries a well-known drawback: a troubling tendency to catch fire. Solid-state batteries replace that liquid with a solid ceramic or polymer, promising faster charging, longer life, higher energy density in smaller packs, and much cooler operation. A new generation of companies hopes to bring these batteries to market, and if they succeed, the technology could substantially ease the shift away from fossil fuels.
For more than a decade, solid-state batteries have been described as "just a few years away." The technology works in laboratories, but challenges remain. In designs pairing a solid electrolyte with a lithium-metal anode, needlelike dendrites can grow during charging, pierce the electrolyte, and short the cell. Many solid electrolytes crack under this pressure. Manufacturing at scale is another hurdle, since electrolytes require large quantities of defect-free ceramic-like sheets and dry rooms for assembly. Most manufacturers expect prices to match lithium-ion packs sometime in the mid-2030s.
QuantumScape, a Bill Gates-backed company launched in Silicon Valley in 2010, built its battery around ceramic materials it says are compatible with lithium, avoiding dendrite formation. Cofounder and chief technology officer Tim Holme says the company spent about a decade learning to process the material. In 2025 it announced a large-scale method that shortens ceramic heat treatment from days to several minutes.
Other players are advancing the technology too. Toyota, the world's largest automaker, began research in 2010 and is partnering with Idemitsu Kosan on a pilot plant, promising cars that travel up to 745 miles after charging for 10 minutes or less. China's CATL, which holds roughly 40% of the global battery market, invested nearly $2.6 billion in solid-state research in 2024 alone. Mercedes equipped an EQS sedan with solid-state batteries last fall, and the car still had range to spare after 750 miles of nonstop driving. Early vehicle versions will likely cost more, since any cost increase is typically passed on to buyers.
Source: MIT Technology Review · Summarized by HeadlinesBriefing