Lithium-ion batteries have become a public safety hazard, with incidents ranging from exploding e-bikes in stairwells to power banks combusting midflight. The volatile liquid electrolytes at their core are driving a search for safer alternatives. Fully solid-state batteries, long hailed as the next breakthrough, still aren't ready for mass adoption.
Enter semi-solid-state batteries, which use a gel-like electrolyte instead of a liquid one. This hybrid approach reduces flammability while remaining compatible with existing manufacturing lines. Companies are beginning to commercialize these gels as a stopgap, offering improved safety without the decade-long wait for true solid-state technology.
The US Consumer Product Safety Commission (CPSC) has flagged the risks of traditional lithium-ion cells, particularly in e-bikes and portable electronics. Semi-solid-state gels promise to mitigate these dangers, though data on their long-term performance and cost competitiveness remains limited. Early adopters include battery pack manufacturers and electric vehicle startups.
If scaled successfully, gel-based batteries could accelerate adoption of safer energy storage in consumer devices, e-bikes, and grid systems. However, they are not a panacea — energy density may be lower than both liquid lithium-ion and future solid-state cells. The industry faces a trade-off between immediate safety gains and ultimate performance.
Some experts caution that semi-solid-state gels are merely an incremental improvement, not a revolution. Without rigorous testing, their safety claims could prove overstated. The Verge notes that the technology is still emerging, with no clear timeline for widespread deployment.