Semi-solid-state batteries: A practical bridge to safer energy storage
Semi-solid-state batteries with a gel-like electrolyte are emerging as a safer and more practical alternative to traditional lithium-ion batteries, already appearing in power banks, e-bikes, and smartphones.
Lithium-ion batteries with liquid electrolytes pose fire risks, leading to major recalls in 2025. The U.S. Consumer Product Safety Commission recalled nearly 1.9 million power banks and tens of thousands of e-bikes due to fire hazards. While true solid-state batteries remain years away, semi-solid-state batteries—using a gel electrolyte instead of liquid—are entering the market.
These batteries maintain the same anode-cathode structure but reduce the risk of thermal runaway. They can be manufactured on existing assembly lines with minor modifications. In May 2025, Ride1Up announced the Revv1 EVO, billed as the world's first semi-solid-state e-bike, with a battery lasting over 1,200 cycles and charging in two hours. Giant also announced it would use semi-solid-state batteries from Heyuan Lithium Innovation in at least five models.
Chinese smartphone makers like Vivo adopted semi-solid-state technology as early as 2024, combining it with silicon-carbon anodes for higher energy density. The technology is also being tested in drones, EVs, and home backup power stations. Adoption is driven by strict Chinese regulations effective December 2025, requiring batteries to pass puncture tests. Widespread adoption could lower costs globally.
True solid-state batteries are still a decade away from mass production, according to Lotus CEO. For now, semi-solid-state batteries offer a practical, safer alternative.
